Transmission cable and communication system

Abstract

Provided in the embodiments of the present application are a transmission cable and a communication system. The transmission cable comprises a sheath, a main optical fiber and a pressure-sensitive adhesive layer, wherein the main optical fiber is located in the sheath, the outer surface of the sheath comprises an activated bonding planar surface, the pressure-sensitive adhesive layer is fixed to the activated bonding planar surface, and the remaining portion, other than the bonding planar surface, of the outer surface of the sheath is an unactivated surface. The activated bonding planar surface has higher surface activity and can be suitably bonded and fixed to the pressure-sensitive adhesive layer, thereby ensuring the reliability of bonding and deployment of the transmission cable. The unactivated surface has lower surface activity and cannot be bonded to the pressure-sensitive adhesive layer, so that the problem of adhesion between the pressure-sensitive adhesive layer and the sheath, etc., during processes such as a winding process can be avoided, and reliable winding, storage, etc., can be realized without providing a release film. During actual deployment, the transmission cable can exhibit characteristics similar to those of a single-sided adhesive tape, and a wound cable, once unwound (peeled), can have the pressure-sensitive adhesive layer directly applied to a wall, so that instant usage upon peeling can be realized, thereby significantly improving deployment efficiency.

Description

Transmission cable and communication system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 11, 2023, with application number 202322481963.5 and application name “A Transmission Cable and Communication System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical communication technology, and in particular to a transmission cable and a communication system. Background Art

[0003] With the rapid development of fiber-optic communication technology, technologies such as fiber-to-the-home (FTTH) and fiber-to-the-room (FTTR) have been widely adopted in communication scenarios. FTTR introduces optical fiber into every room to connect the optical network unit (ONU) in the communication system with the optical line terminal (OLT) in each room. Optical fiber offers strong transmission capabilities, high transmission rates, a longer lifespan, and lower signal attenuation, making it easy to achieve gigabit connectivity throughout the home.

[0004] Typically, indoor fiber optic cabling is deployed using open wires, and the optical cables used are often transparent, invisible cables to minimize damage to the aesthetics of the wall. These invisible cables are often secured to the wall through bonding. For example, an adhesive layer and a release film are laminated on one side of the cable, securing the cable to the wall with the adhesive layer. The release film prevents the cable from sticking during storage, transportation, and other processes. During deployment, the cable must be fixed to the wall using the adhesive layer while removing the release layer. This reduces deployment efficiency.

[0005] Utility Model Content

[0006] The embodiments of the present application provide a transmission cable and a communication system. The transmission cable does not need to be provided with a release film and can avoid the adhesion problem that exists during the winding and storage process. During deployment, the transmission cable can be torn and stuck at the same time, and the deployment operation is simple and the deployment efficiency is high.

[0007] The first aspect of the embodiments of the present application provides a transmission cable, comprising a main optical fiber, a sheath, and a pressure-sensitive adhesive layer, wherein the main optical fiber is located inside the sheath, and the outer surface of the sheath includes an activated bonding plane, the bonding plane extending along a first direction, the first direction being the extension direction of the sheath, and the pressure-sensitive adhesive layer being bonded and fixed to the bonding plane, so that the transmission cable is laid and fixed on a wall or the like through the pressure-sensitive adhesive layer. An activated bonding plane refers to a bonding plane having higher activity, where activity is the property of reacting or promoting a rapid reaction, which makes the activated bonding plane more likely to interact with other substances (such as the pressure-sensitive adhesive layer) and improve the bonding strength between the two. The outer surface of the sheath may also include an unactivated surface, which refers to the remaining surface on the outer surface of the sheath excluding the bonding plane. The surface energy of the activated bonding plane may be higher than the surface energy of the unactivated surface. The activated bonding plane may be a surface activation treatment performed on a portion of the outer surface of the sheath to make it an activated bonding plane, and the unactivated surface may be the remaining outer surface of the sheath, that is, the surface that has not been surface activated.

[0008] The activated bonding surface has higher activity and surface energy, and can be well bonded and fixed to the pressure-sensitive adhesive layer, thereby improving the bonding strength between the sheath and the pressure-sensitive adhesive layer, reducing or avoiding the risk of the transmission cable falling off, and ensuring the stability and reliability of the transmission cable bonding deployment. In addition, since the remaining surface of the sheath is an unactivated surface, the unactivated surface has lower activity and surface energy and cannot bond to the pressure-sensitive adhesive layer (or the bonding strength is very weak), which can avoid the problem of adhesion between the pressure-sensitive adhesive layer and the sheath (unactivated surface) during winding, storage, and transportation. The transmission cable does not need to be provided with a release film to isolate the pressure-sensitive adhesive layer, and can also achieve reliable winding, storage, and transportation.

[0009] During actual deployment, transmission cables can behave like single-sided tape. Unroll (or tear) the rolled-up transmission cable and place it directly on a wall. Pressing the pressure-sensitive adhesive layer to bond and secure the cable to the wall secures it. This allows for immediate deployment, saving on deployment steps and significantly improving deployment efficiency while reducing cost and weight. The ease of deployment also enhances deployment flexibility, and the simple, user-friendly operation further improves deployment efficiency and enables rapid deployment of communication networks.

[0010] In one possible implementation, the sheath has a cavity within it, and the main optical fiber is movably disposed within the cavity. The outer surface of the sheath also includes a first side surface, and an open slot is defined on the first side surface. The first side surface and the open slot extend in a first direction, and the open slot is connected to the cavity. The open slot is used to allow the main optical fiber to pass through and be disposed within the cavity. The main optical fiber can pass through the open slot and be disposed within the cavity. Conversely, the main optical fiber within the cavity can also be removed through the open slot. This allows for replacement, repair, addition, and removal of the internal main optical fiber without having to peel off the entire sheath. This allows for individual replacement and maintenance of the main optical fiber without having to replace the entire transmission cable, facilitating subsequent maintenance and reducing maintenance and update costs.

[0011] In addition, the opening groove is connected to the cavity, so that the cavity inside the sheath for accommodating the optical fiber has an opening, which can make the sheath easier to peel off and more convenient to peel off the sheath from the opening groove to expose the main optical fiber, facilitate fiber stripping construction for rapid fusion splicing and on-site termination, and significantly improve installation efficiency.

[0012] In one possible implementation, the sheath includes a first elastic wall and a second elastic wall disposed opposite each other along the second direction, with a gap between the first and second elastic walls forming an open slot. The minimum width of the open slot in the third direction is less than the diameter of the main optical fiber, and the third, first, and second directions are mutually perpendicular. The elastic properties of the first and second elastic walls ensure that the main optical fiber can be placed within the cavity through the open slot. Furthermore, the main optical fiber's diameter is greater than the minimum width of the open slot, which acts as a position limiter for the main optical fiber, preventing it from falling out of the cavity through the open slot without external forces, thereby facilitating the placement and position limiting of the main optical fiber within the cavity.

[0013] In one possible implementation, the first side surface and the bonding plane are arranged opposite each other in the third direction. The transmission cable is fixed to a wall or the like via the bonding plane, with the first side surface facing the bonding plane. When performing maintenance or replacement operations on the main optical fiber, the main optical fiber can be easily accessed through the opening groove on the first side surface, thereby facilitating maintenance.

[0014] In one possible implementation, the transmission cable further includes a dust cover disposed on the first side surface and covering the opening. The dust cover prevents dust, moisture, and the like from entering the cavity through the opening and damaging the optical fiber, thereby improving the reliability of the transmission cable.

[0015] In a possible implementation, the open slot includes a first open end and a second open end opposite to each other in the third direction, the first open end is adjacent to the cavity, and the second open end is located on the first side surface.

[0016] The dust cover includes a connected shell cover and a fixing member. The shell cover abuts against the first side surface and completely covers the second open end. The fixing member is engaged with the first open end by a clip. There is no need to set up an additional adhesive layer, fixing structure or clipping structure. The dust cover is fixed by directly engaging the fixing member of the dust cover with the first open end of the opening slot. The structural design is simple, easy to produce, and helps to reduce the cost and weight of the transmission cable. In addition, the clip-on fixing method can achieve detachability, that is, the detachability of the dust cover and the sheath is achieved, so that the dust cover can be removed to expose the opening slot to replace the main optical fiber, and it is also convenient to continue to use the dust cover to cover the opening slot after maintenance and replacement operations.

[0017] In one possible implementation, the fixing member includes a connecting portion and a clamping portion, the connecting portion being connected to the housing cover, the clamping portion being configured to pass through the first opening end and extend into the cavity, and the clamping portion abutting against the surfaces of the first and second elastic walls facing the cavity, respectively. In other words, in the absence of external force, the clamping portion cannot pass through the first opening end but abuts against the surfaces of the first and second elastic walls facing the cavity, thereby retaining the dust cover in place via the clamping portion and preventing it from falling off the housing.

[0018] In one possible implementation, a first auxiliary groove is defined on the bonding plane, extending along a first direction. This first auxiliary groove facilitates sheath stripping, exposing the primary optical fiber for fusion splicing or on-site termination, facilitating fiber stripping and improving installation efficiency. The first auxiliary groove also increases the bonding area of ​​the bonding plane, enhancing the bond strength between the pressure-sensitive adhesive layer and the bonding plane.

[0019] In a possible implementation, the width of the cavity in the second direction satisfies: L / (n*D)≤1.8, where L is the width of the cavity in the second direction, n is the number of main optical fibers, and D is the diameter of a single main optical fiber.

[0020] The cavity's height in the third direction satisfies the following condition: H / (n*D) ≤ 1, where H is the cavity's height in the third direction. By properly controlling the cavity's width and height to ensure sufficient space for the main optical fiber to move, damage to the main optical fiber caused by bending or turning within the cavity can be reduced or avoided.

[0021] In one possible implementation, the inner surface of the sheath fits against the outer surface of the main fiber, securing the main fiber within the sheath. The main fiber cannot move within the sheath, effectively protecting it and minimizing or preventing damage to the main fiber caused by misalignment between the main fiber and the sheath during winding or deployment, thereby extending the life of the main fiber.

[0022] In one possible implementation, the outer surface of the jacket further comprises a first side surface, the first side surface being arranged opposite the bonding plane in a third direction, and a first auxiliary groove and a second auxiliary groove being respectively defined in the bonding plane and the first side surface, with the first auxiliary groove and the second auxiliary groove each extending in the first direction. The first and second auxiliary grooves facilitate tearing the jacket apart, quickly exposing the ends of the main optical fibers for fusion splicing and on-site termination (on-site connectorization), facilitating fiber stripping during installation and improving installation efficiency.

[0023] In one possible implementation, multiple main optical fibers are spaced apart and arranged at the center of the sheath. Each main optical fiber is used to transmit optical signals, enabling the transmission cable to meet the requirements of multi-core communications, increase deployment density, and enable multi-core access to homes in FTTR systems.

[0024] In one possible implementation, the outer surface of the sheath further includes a second side surface and a third side surface, each extending along the first direction, disposed opposite each other in the second direction, and both connected to the bonding plane and the first side surface. The outer peripheral side of the sheath is enclosed by the first side surface, the second side surface, the third side surface, and the bonding plane, facilitating promotion and production. While maintaining a small transmission cable volume, the bonding plane can have a larger area, thereby enhancing the bond strength with the pressure-sensitive adhesive layer.

[0025] In one possible implementation, the sheath is formed of a flame-retardant material, and the flame-retardant grade of the sheath meets the EN60332 standard. The sheath has good flame-retardant properties, effectively ensuring the safety of the transmission cable and reducing the risk of flammability of the transmission cable.

[0026] In a possible implementation, the transmission cable is a transparent transmission cable with low visibility, which can be easily invisible to improve the aesthetics of cable deployment.

[0027] A second aspect of an embodiment of the present application provides a communication system comprising at least a first communication device, a second communication device, and any of the aforementioned transmission cables, wherein the first communication device and the second communication device are connected via the transmission cable. By including the transmission cable, the transmission cable can be deployed ready to use, making the deployment operation simple and easy to use, significantly improving deployment efficiency and, in turn, improving the efficiency of indoor network deployment of the entire optical communication system. Furthermore, the transmission cable can implement multi-core communication, enabling the optical communication system to meet the demand for multi-core access to homes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic structural diagram of a transmission cable provided in an embodiment of the present application;

[0029] FIG2 is a schematic cross-sectional view of the transmission cable along plane AA in FIG1 ;

[0030] FIG3 is a cross-sectional schematic diagram of another transmission cable provided in an embodiment of the present application;

[0031] FIG4 is a schematic structural diagram of another transmission cable provided in an embodiment of the present application;

[0032] FIG5 is a schematic diagram of the cross-sectional structure of the transmission cable along plane AA in FIG4 ;

[0033] FIG6 is a schematic structural diagram of another transmission cable provided in an embodiment of the present application;

[0034] FIG7 is a front view of a dust cover in another transmission cable according to an embodiment of the present application;

[0035] FIG8 is a schematic diagram of the cross-sectional structure of the transmission cable along plane AA in FIG6 .

[0036] Description of reference numerals:

[0037] 100-transmission cable;

[0038] 10-main optical fiber;

[0039] 20-sheath; 20a-first elastic wall; 20b-second elastic wall;

[0040] 21- bonding plane;

[0041] 211-first auxiliary slot;

[0042] 22-cavity;

[0043] 23- first side;

[0044] 231-opening slot;

[0045] 232 - second auxiliary groove; 231a - first opening end; 231b - second opening end;

[0046] 24- second side;

[0047] 25-third side;

[0048] 30-pressure-sensitive adhesive layer;

[0049] 40-dust cover;

[0050] 41-shell cover;

[0051] 42-fixing parts;

[0052] 421-connection part;

[0053] 422-clamping portion;

[0054] 50-Reinforcement. DETAILED DESCRIPTION

[0055] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0056] An embodiment of the present application provides a transmission cable, which may be an optical cable. Of course, in some examples, the transmission cable may also be a hybrid of an optical cable and an electrical cable. In the embodiment of the present application, the transmission cable is an optical cable as an example for illustration.

[0057] Transmission cables can be used in optical communication systems to connect devices and thereby transmit optical signals between them. For example, an optical communication system can include a first device and a second device, which can be connected via a transmission cable. The transmission cable acts as a carrier for optical signals, enabling transmission of optical signals between the first and second devices.

[0058] Among them, the first device and the second device are optical communication devices, which can be any communication devices that use light waves to transmit information. For example, the first device and the second device can be optical terminals (including transmitting devices, receiving devices or integrated transceiver devices, etc.), optical filters, optical fiber connectors, instruments for optical communication, power supplies for communication, etc.

[0059] For example, the transmission cable can be used in a fiber-to-the-home (FTTH) communication system, or in a fiber-to-the-room (FTTR) communication system. The transmission cable can be an optoelectronic composite cable or an optical cable.

[0060] Typically, in a fiber-to-the-room (FTTR) system solution, the optical network unit (ONU) can be connected to the user's home's main optical network terminal (ONT) to achieve fiber-to-the-home (FTTH). The main optical network terminal (first device, such as a main optical modem) is then connected to the optical line terminal (OLT) (second device, such as an information box) in each room via optical cables, ensuring that each room has a stable network point, thus forming a complete all-optical home network scenario.

[0061] Optical cables are often laid out in rooms using open wiring, and are often secured to walls and other surfaces by bonding. For example, an optical cable typically consists of a sheath and the main optical fiber within. Optical cables can be categorized as either unbonded or bonded. Unbonded cables lack an adhesive layer on the outer sheath. During actual deployment, the cables can be secured to walls and other surfaces by applying glue or adhesive layers (such as hot-melt tape or glass tape). This means that during deployment, the cables must be repeatedly bonded while applying glue (or applying adhesive layers), which significantly reduces deployment efficiency.

[0062] An adhesive optical cable usually refers to one with an adhesive layer formed on the outside of the sheath. For example, part of the surface of the sheath is provided with double-sided tape. The first adhesive surface of the double-sided tape is fixed to the surface of the sheath, and the second adhesive surface of the double-sided tape can adhere the optical cable to a wall, etc. Since optical cables are mostly stored in a reel, in order to avoid the adhesive layer (such as the double-sided tape mentioned above) from adhering to its own sheath (the surface without the adhesive layer), other cable sheaths, or other objects during the reeling, storage, and transportation process, which may damage the adhesive layer and even cause the optical cable to be unable to be bonded and deployed, the optical cable usually also includes a release film. The release film is adhered to the side of the adhesive layer facing away from the sheath (such as the second adhesive surface of the double-sided tape). The release film serves to isolate and protect the adhesive layer during the reeling, transportation, and on-site deployment processes.

[0063] During actual deployment, it is necessary to repeatedly remove the release film while bonding the optical cable to a wall or other surface through the adhesive layer, which also results in low deployment efficiency. Furthermore, the release film can easily adhere too tightly to the adhesive layer, making it difficult to peel off. Alternatively, the release film can be too loosely bonded to the adhesive layer, causing the release film to easily fall off, causing the optical cable to stick together during winding and storage, or to other optical cables or objects. Both of these factors can reduce deployment efficiency and may even damage the adhesive layer or prevent the optical cable from being bonded and deployed, reducing the reliability and stability of the deployment.

[0064] Based on this, the embodiment of the present application provides a transmission cable, so that the outer surface of the sheath has an activated bonding plane, and the pressure-sensitive adhesive layer can be firmly bonded to the activated bonding plane, meeting the needs of the transmission cable deployment and fixation. The pressure-sensitive adhesive layer cannot be firmly bonded to other unactivated outer surfaces of the sheath, and the problem of adhesion between the pressure-sensitive adhesive layer and the sheath during winding, storage, transportation, etc. can be avoided without a release film. During actual deployment, the unfolded (or torn) rolled transmission cable is directly placed on a wall, etc., and the pressure-sensitive adhesive layer is pressed to bond and fix to the wall, that is, the transmission cable is fixed to the wall, which can be used immediately after being torn off, which significantly improves the deployment efficiency of the transmission cable. In addition, it also avoids problems such as damage to the adhesive layer due to the release film being too tight or too loosely bonded to the adhesive layer, which is beneficial to improving the stability and reliability of the deployment of the transmission cable.

[0065] The transmission cable provided in the embodiments of the present application is described below with reference to the accompanying drawings.

[0066] FIG1 is a schematic structural diagram of a transmission cable provided in an embodiment of the present application.

[0067] 1 , a transmission cable 100 may include a sheath 20 and a main optical fiber 10 , wherein the main optical fiber 10 is used to transmit optical signals. For example, the main optical fiber 10 may be made of silica, and optical signals may be transmitted on the main optical fiber 10 .

[0068] Of course, in some other examples, the molding material of the main optical fiber 10 may also be any other material that can realize optical signal transmission. For example, the molding material of the main optical fiber 10 may also be polymethyl methacrylate, etc.

[0069] The main optical fiber 10 is located inside the sheath 20, and the sheath 20 is wrapped around the entire length extension direction of the main optical fiber 10. The sheath 20 plays a role of isolation and protection for the main optical fiber 10, and can prevent the main optical fiber 10 from being damaged by collision, extrusion, etc. with the external environment during transportation, deployment, etc.

[0070] In the embodiment of the present application, the first direction is the extension direction of the jacket 20. The extension direction of the jacket 20 can be consistent with the length extension direction of the main optical fiber 10, such as the y-direction shown in Figure 1. The first direction can also be the length direction of the jacket 20 (or transmission cable 100). The second direction is the width direction of the jacket 20 (or transmission cable 100), such as the x-direction shown in Figure 1. The third direction is the height direction of the jacket 20 (or transmission cable 100), such as the z-direction shown in Figure 1.

[0071] When the transmission cable 100 is installed, for example, when the transmission cable 100 is used to connect a first device (such as an optical modem) and a second device (such as an optical line terminal) in an optical communication system, the jacket 20 at one end of the transmission cable 100 can be torn off to expose one end of the main optical fiber 10. This end of the main optical fiber 10 can then be connected to the optical modem by fusing the main optical fiber 10 or connecting a connector. Accordingly, the jacket 20 at the other end of the transmission cable 100 can be torn off to expose the other end of the main optical fiber 10. This can then be connected to the optical line terminal, thereby connecting the two devices and enabling transmission of optical signals between the two devices.

[0072] Continuing with FIG1 , the outer surface of the sheath 20 includes an activated bonding plane 21 extending along a first direction, i.e., distributed along the entire length of the sheath 20. The outer surface of the sheath 20 may also include an unactivated surface, which may also extend along the first direction. The unactivated surface refers to the remaining surface of the outer circumferential surface of the sheath 20 excluding the bonding plane 21. The unactivated surface and the activated bonding plane are connected to form the outer surface of the sheath 20, and the activated bonding plane 21 may be located on one side of the unactivated surface.

[0073] FIG2 is a schematic cross-sectional view of the transmission cable along plane AA in FIG1 .

[0074] For example, referring to FIG2 , taking the transmission cable 100 as a butterfly-shaped optical cable as an example, the outer surface of the sheath 20 may include a first side 23, a second side 24, a third side 25 and an activated bonding plane 21, wherein the first side 23, the second side 24 and the third side 25 may be unactivated surfaces.

[0075] An activated bonding surface 21 means that the bonding surface 21 has a higher activity. Activity is the property of reacting or promoting a rapid reaction. This makes the activated bonding surface 21 more likely to interact with other substances (such as the pressure-sensitive adhesive layer 30), thereby improving the bonding strength between the two. For example, surface energy refers to a measure of the destruction of intermolecular chemical bonds when creating a material surface. The surface energy of the activated bonding surface 21 can be higher than the surface energy of an unactivated surface. For example, the surface energy of the activated bonding surface 21 is higher than the surface energy of any of the first side 23, the second side 24, and the third side 25. The unactivated surface has lower activity and surface energy.

[0076] The activated bonding plane 21 may be a surface activation treatment performed on a portion of the outer surface of the sheath 20 to form the activated bonding plane 21. The unactivated surface may be the remaining outer surface of the sheath 20, i.e., the surface that has not been surface activated.

[0077] Exemplarily, the activation treatment method can be a physical activation treatment. For example, the bonding plane 21 can be physically activated by corona treatment. Corona treatment is an electric shock treatment that can make the surface of the bonding plane 21 have higher adhesion, and can break the chemical bonds of the sheath 20 molecules at the bonding plane 21 and degrade them, thereby increasing the surface roughness and surface area. In addition, it can also oxidize the sheath 20 molecules to produce highly polar groups such as carbonyl and peroxide, thereby increasing its surface energy.

[0078] Alternatively, the activation treatment may be a chemical activation treatment. For example, the bonding plane 21 may be chemically activated using an alkaline activation agent, such as a sodium naphthalene solution, so that the surface of the bonding plane 21 has more free radicals and groups with stronger polarity, thereby increasing its surface energy.

[0079] Of course, in some examples, the bonding plane 21 may be activated by combining physical activation and chemical activation to enhance the activity and surface energy of the bonding plane 21 .

[0080] As shown in Figures 1 and 2 , the transmission cable 100 may further include a pressure-sensitive adhesive layer 30, which is bonded and fixed to the activated bonding plane 21. The pressure-sensitive adhesive layer 30 is a pressure-sensitive adhesive having adhesive properties. The pressure-sensitive adhesive layer 30 can be used to secure the transmission cable 100. For example, by pressing the pressure-sensitive adhesive layer 30, the transmission cable 100 can be bonded and fixed to a wall or the like. It should be understood that the pressure-sensitive adhesive layer 30 also extends along the first direction, and the activated bonding plane 21 and the pressure-sensitive adhesive layer 30 are present along the entire length of the jacket 20.

[0081] Because the activated bonding plane 21 has higher activity and surface energy, it can be well bonded and fixed to the pressure-sensitive adhesive layer 30, thereby improving the bonding strength between the sheath 20 and the pressure-sensitive adhesive layer 30, reducing or avoiding the risk of the transmission cable 100 falling off, and ensuring the stability and reliability of the bonding deployment of the transmission cable 100. In addition, because the remaining surface of the sheath 20 is an unactivated surface, the unactivated surface has lower activity and surface energy and cannot bond to the pressure-sensitive adhesive layer 30 (or the bonding strength is very weak), it can avoid the problem of adhesion between the pressure-sensitive adhesive layer 30 and the sheath 20 (unactivated surface) during the process of winding, storage, transportation, etc., and the transmission cable 100 does not need to be provided with a release film to isolate the pressure-sensitive adhesive layer 30, and can also achieve reliable winding, storage, transportation, etc.

[0082] During actual deployment, the transmission cable 100 can have properties similar to those of single-sided tape. The rolled-up transmission cable 100 can be unfolded (or torn) and directly placed on a wall, etc., and the pressure-sensitive adhesive layer 30 can be pressed to adhere to the wall to fix the transmission cable 100 to the wall. This allows for immediate use, saving deployment steps for the transmission cable 100, significantly improving deployment efficiency, and helping to reduce the cost and weight of the transmission cable 100. The easy deployment feature of the transmission cable 100 also helps to improve deployment flexibility, facilitates independent deployment design (DIY deployment), and is simple and easy to use, which can further improve deployment efficiency and achieve rapid deployment of communication networks.

[0083] In addition, it can also avoid problems such as damage to the adhesive layer caused by the release film being bonded too tightly or too loosely to the adhesive layer in common transmission cables, which is beneficial to improving the stability and reliability of transmission cable deployment.

[0084] For example, in a typical FTTR surface-mounted deployment scenario, a typical transmission cable with a release film takes over 30 minutes, or even over an hour, to deploy in a single room. However, the transmission cable 100 provided in this embodiment does not have a release film and can be removed and used immediately. This allows the transmission cable 100 to be pre-bonded and easily deployed, making deployment simple and easy. It can be quickly fixed to the wall, and the time required to complete the same deployment in the same room is under 15 minutes, significantly improving deployment efficiency and significantly saving deployment time.

[0085] Continuing with FIG. 2 , in this embodiment of the present application, the number of main optical fibers 10 can be multiple. For example, the transmission cable 100 in FIG. 2 can include two main optical fibers 10 , namely, main optical fiber 10a and main optical fiber 10b. Each main optical fiber 10 is used to transmit optical signals, enabling the transmission cable 100 to meet the requirements of multi-core communication, improve deployment density, and implement multi-core access to the home in FTTR systems.

[0086] Multiple main optical fibers 10 can be spaced apart at the center of the sheath 20, and multiple main optical fibers 10 can be spaced apart along one direction. For example, the main optical fiber 10a and the main optical fiber 10b in Figure 2 can be spaced apart at the center of the sheath 20 along the second direction (x direction).

[0087] Alternatively, in some other examples, the plurality of optical fibers may be distributed at the center in other ways. For example, the plurality of main optical fibers 10 may be distributed in regular or irregular patterns such as circles, triangles, and squares.

[0088] Among them, the width of the sheath 20 in the second direction (x direction) can be greater than 1.6 mm. The sheath 20 is wider, which can ensure sufficient internal space to arrange multiple main optical fibers 10, and is also beneficial to increase the area of ​​the activated bonding plane 21, which is beneficial to improving the bonding strength between the bonding plane 21 and the pressure-sensitive adhesive layer 30.

[0089] Of course, in some examples, the number of the main optical fiber 10 may also be one, so that the transmission cable 100 is a single-core cable.

[0090] It should be noted that the main optical fiber 10 can be a bare optical fiber, that is, its outer surface is not covered with other structures.

[0091] Alternatively, the main optical fiber 10 may include a bare optical fiber and an outer sheath, wherein the outer sheath is wrapped around the outer circumference of the bare optical fiber to form the main optical fiber 10 , and the main optical fiber 10 is entirely located within the sheath 20 .

[0092] FIG3 is a cross-sectional schematic diagram of another transmission cable provided in an embodiment of the present application.

[0093] In some examples, as shown in FIG. 3 , the transmission cable 100 may further include a reinforcement member 50 . The number of the reinforcement members 50 may be multiple, and the reinforcement members 50 may also extend along the first direction, that is, distributed along the length extension direction of the entire jacket 20 .

[0094] Multiple reinforcement members 50 can be located within the jacket 20 and spaced apart around the outer circumference of the primary optical fibers 10. The reinforcement members 50 can support the jacket 20, reducing or preventing damage to the primary optical fibers 10 in situations such as compression or crushing by heavy objects. Furthermore, the reinforcement members 50 can enhance the tensile and bending strength of the entire transmission system, enabling it to withstand greater construction pressures and reducing or preventing damage to the primary optical fibers 10 caused by excessive traction or sharp bending angles during installation.

[0095] The plurality of strength members 50 may be evenly distributed around the periphery of the plurality of main optical fibers 10 to protect the main optical fibers 10 in multiple dimensional directions.

[0096] Alternatively, multiple strength members 50 can be distributed on one side or both sides of multiple main optical fibers 10 along one direction. For example, as shown in Figure 3, multiple strength members 50 can be distributed on both sides of multiple main optical fibers 10 along the second direction (x direction) to ensure better support and protection for the main optical fibers 10.

[0097] In some examples, at least one of the multiple reinforcement members 50 can also be an auxiliary optical fiber, which can also be used to transmit optical signals. After the main optical fiber 10 is damaged, the auxiliary optical fiber can be fusion-spliced ​​and used to realize signal transmission. There is no need to replace the entire transmission cable 100, which can facilitate the maintenance of the transmission cable 100 and help save maintenance and replacement costs.

[0098] As shown in conjunction with Figures 2 and 3 , in some possible examples, the sheath 20 can tightly wrap around each main optical fiber 10, with the inner surface of the sheath 20 closely fitting the outer surface of each main optical fiber 10, so that the sheath 20 wraps around and secures the main optical fiber 10. The main optical fiber 10 is immobile within the sheath 20, which can better protect the main optical fiber 10, reduce or avoid damage to the main optical fiber 10 caused by asynchronous bending of the main optical fiber 10 and the sheath 20 during winding or deployment, and thus increase the lifespan of the main optical fiber 10.

[0099] Exemplarily, continuing to combine FIG2 and FIG3 , the outer surface of the sheath 20 includes a first side surface 23 , a second side surface 24 and a third side surface 25 , and the first side surface 23 , the second side surface 24 and the third side surface 25 extend along a first direction (y direction) respectively.

[0100] The first side surface 23 and the activated bonding plane 21 can be arranged relative to each other in the third direction (z-direction), and the second side surface 24 and the third side surface 25 can be arranged relative to each other in the second direction. The outer peripheral side surface of the jacket 20 is surrounded by the first side surface 23, the second side surface 24, the third side surface 25, and the bonding plane 21, which facilitates promotion and production. While ensuring the small size of the transmission cable 100, the bonding plane 21 can have a larger area, thereby improving the bonding strength with the pressure-sensitive adhesive layer 30.

[0101] Among them, a first auxiliary groove 211 and a second auxiliary groove 232 can be formed on the bonding plane 21 and the first side surface 23, respectively. The first auxiliary groove 211 and the second auxiliary groove 232 also extend along the first direction, respectively. That is, the first auxiliary groove 211 and the second auxiliary groove 232 are distributed in the entire length extension direction of the transmission cable 100, so that the cross-sectional shape of the sheath 20 can be a dish-like shape as shown in Figure 3.

[0102] Of course, in some other examples, the shape of the sheath 20 may also be a regular or irregular shape such as a rectangle, a square, a triangle, or a semicircle.

[0103] When installing the transmission cable 100, the sheath 20 can be easily torn open through the auxiliary groove to quickly expose the end of the main optical fiber 10 for welding and on-site termination (on-site connector making), which facilitates fiber stripping construction and helps improve installation efficiency.

[0104] The first auxiliary groove 211 and the second auxiliary groove 232 are respectively provided on the opposite first side surface 23 and the bonding plane 21 , which can more easily separate the sheath 20 into two parts quickly and more conveniently and quickly expose the main optical fiber 10 .

[0105] It can be understood that the pressure-sensitive adhesive layer 30 is bonded and fixed on the activated bonding plane 21, and the pressure-sensitive adhesive layer 30 covers and fills the first auxiliary groove 211 of the bonding plane 21. The setting of the first auxiliary groove 211 can also help increase the bonding area between the pressure-sensitive adhesive layer 30 and the bonding plane 21, which is conducive to further improving the bonding strength of the pressure-sensitive adhesive layer 30 and the sheath 20.

[0106] The shapes of the first auxiliary groove 211 and the second auxiliary groove 232 may be triangular. Of course, in some other examples, the shapes of the first auxiliary groove 211 and the second auxiliary groove 232 may also be regular or irregular shapes such as square and inverted trapezoid.

[0107] The shape and size of the first auxiliary groove 211 may be the same as those of the second auxiliary groove 232 , or they may be different.

[0108] Alternatively, in some other examples, the auxiliary groove may be formed only on one side of the sheath 20 , for example, the first auxiliary groove 211 may be formed only on the first side surface 23 , so as to facilitate tearing of the sheath 20 .

[0109] In some other possible examples, the main optical fiber 10 may also be fixed in the sheath 20 in a movable manner.

[0110] FIG4 is a schematic structural diagram of another transmission cable provided in an embodiment of the present application.

[0111] 4 , the sheath 20 may have a cavity 22 therein. The cavity 22 may also extend along a first direction and be distributed along the entire length of the sheath 20 . The main optical fiber 10 may be movably disposed in the cavity 22 .

[0112] An opening slot 231 may be formed on the first side surface 23 of the sheath 20 . The opening slot 231 may also extend along the first direction, that is, the opening slot 231 is also distributed along the entire length extension direction of the sheath 20 .

[0113] The opening groove 231 can be connected to the cavity 22, and the main optical fiber 10 can be passed through the opening groove 231 and set in the cavity 22. Conversely, the main optical fiber 10 located in the cavity 22 can also be taken out through the opening groove 231, and the internal main optical fiber 10 can be replaced, repaired, added, and deleted without peeling off the entire sheath 20.

[0114] For example, when the main optical fiber 10 is damaged and needs to be replaced and maintained, the main optical fiber 10 can be replaced and maintained without peeling off the entire sheath 20. The main optical fiber 10 can be replaced and maintained separately without replacing and maintaining the entire cable, which facilitates later maintenance and reduces the cost of maintenance and updates.

[0115] In addition, the opening groove 231 is connected to the cavity 22, so that the cavity 22 inside the sheath 20 for accommodating the optical fiber has an opening, which can give the sheath 20 the characteristic of being easier to peel off, making it more convenient to peel off the sheath 20 from the opening groove 231 to expose the main optical fiber 10, making it more convenient to construct fiber stripping, so as to quickly perform welding and on-site termination, significantly improving installation efficiency.

[0116] Among them, the transmission cable 100 is fixed to a wall or the like through the bonding plane 21, so that the opening groove 231 is located on the first side surface 23 opposite to the bonding plane 21. When the main optical fiber 10 is maintained or replaced, the main optical fiber 10 can be easily operated through the opening groove 231, which facilitates maintenance.

[0117] FIG5 is a schematic diagram of the cross-sectional structure of the transmission cable along plane AA in FIG4 .

[0118] Exemplarily, as shown in FIG. 5 , the sheath 20 may include a first elastic wall 20 a and a second elastic wall 20 b that are oppositely disposed in the second direction. The first elastic wall 20 a and the second elastic wall 20 b have certain elastic properties and can undergo elastic deformation.

[0119] The first elastic wall 20 a and the second elastic wall 20 b may also extend along the first direction and are distributed along the entire length of the sheath 20 , with a gap between the first elastic wall 20 a and the second elastic wall 20 b to form an open slot 231 .

[0120] The minimum width of the opening slot 231 in the third direction (z-direction) can be smaller than the diameter of the main optical fiber 10. The elastic properties of the first elastic wall 20a and the second elastic wall 20b can ensure that the main optical fiber 10 can be placed within the cavity 22 through the opening slot 231. Because the diameter of the main optical fiber 10 is greater than the minimum width of the opening slot 231, it can serve as a position limiter for the main optical fiber 10, preventing the main optical fiber 10 from falling out of the cavity 22 through the opening slot 231 without the influence of external forces, thereby facilitating the placement and position limiting of the main optical fiber 10 within the cavity 22.

[0121] A first auxiliary groove 211 may also be provided on the activated bonding plane 21 , which also facilitates peeling of the sheath 20 and helps to improve the bonding strength between the pressure-sensitive adhesive layer 30 and the bonding plane 21 .

[0122] 5 , the shape of the opening slot 231 can be triangular. For example, in the case where the opening slot 231 includes two open ends, such as a first open end 231a and a second open end 231b, the first open end 231a can be located adjacent to the cavity 22, and the second open end 231b can be located on the first side surface 23. The width of the opening slot 231 in the second direction (x direction) can gradually decrease from the second open end 231b to the first open end 231a, so that the shape of the opening slot 231 is triangular.

[0123] That is, the first opening end 231a has the smallest width in the second direction, and the diameter of the main optical fiber 10 can be larger than the width of the first opening end 231a in the second direction. By making the second opening end 231b wider and the opening groove 231 gradually decreasing in width from the second opening end 231b toward the interior of the cavity 22, the main optical fiber 10 can be easily placed in or removed from the cavity 22.

[0124] The width L of the cavity 22 in the second direction can satisfy L / (n*D) ≤ 1.8, where n is the number of main optical fibers 10 and D is the diameter of a single main optical fiber 10. The height H of the cavity 22 in the third direction can satisfy H / (n*D) ≤ 1. By properly controlling the width and height of the cavity 22 and ensuring sufficient space for the main optical fibers 10 to move, damage to the main optical fibers 10 caused by bending and turning within the cavity 22 can be reduced or avoided.

[0125] For example, taking two main optical fibers 10 within the sheath 20 as an example, the diameter of each main optical fiber 10 can be 0.5 mm, the width L of the cavity 22 in the second direction can be 0.9 mm, and the height H of the cavity 22 in the third direction can be 0.5 mm. The width of the sheath 20 in the second direction can be 3 mm, and the height of the sheath 20 in the third direction can be 2 mm.

[0126] FIG6 is a schematic structural diagram of another transmission cable provided in an embodiment of the present application.

[0127] To reduce the risk of dust and other substances entering the cavity 22 through the openings 231 and contaminating or damaging the main optical fiber 10, as shown in FIG6 , the transmission cable 100 may further include a dust cover 40. The dust cover 40 may be disposed on the first side 23 and cover the openings 231, thereby preventing dust, moisture, and other substances from entering the cavity 22 and potentially damaging the main optical fiber 10, thereby improving the reliability of the transmission cable 100.

[0128] FIG7 is a front view structural diagram of a dust cover in another transmission cable provided in an embodiment of the present application, and FIG8 is a cross-sectional structural diagram of the transmission cable along the AA plane in FIG6 .

[0129] As shown in FIG7 , the dust cover 40 may include a shell cover 41 and a fixing member 42, with the shell cover 41 connected to the fixing member 42. As shown in FIG8 , the dust cover 40 is fixed to the first side surface 23 of the sheath 20, with the shell cover 41 abutting against the first side surface 23. The shell cover 41 completely covers the second open end 231b of the opening slot 231, that is, covers the entrance of the opening slot 231, thereby facilitating the shielding of the opening slot 231. The abutment between the shell cover 41 and the first side surface 23 also serves to limit the dust cover 40, preventing it from falling into the cavity 22.

[0130] The fixing member 42 engages with the first open end 231a of the opening slot 231 by snapping, eliminating the need for additional adhesive layers, fixing structures, or snap-fit ​​structures. The dust cover 40 is secured by the fixing member 42 of the dust cover 40 directly engaging with the first open end 231a of the opening slot 231. This simple structural design facilitates production and helps reduce the cost and weight of the transmission cable.

[0131] In addition, the dust cover 40 and the sheath 20 can be detachable by means of a clamping fixation, so that the dust cover 40 can be removed to expose the opening groove 231 to replace the main optical fiber 10, and it is also convenient to continue to use the dust cover 40 to cover the opening groove 231 after maintenance and replacement operations.

[0132] 7 and 8 , the fixing member 42 may include a connecting portion 421 and a clamping portion 422. One end of the connecting portion 421 may be connected and fixed to the shell cover 41, and the other end of the connecting portion 421 may be connected and fixed to the clamping portion 422. The clamping portion 422 may pass through the first opening end 231a of the opening groove 231 and extend into the cavity 22.

[0133] Furthermore, the engaging portion 422 can abut against the surfaces of the first elastic wall 20a and the second elastic wall 20b facing the cavity 22. In other words, in the absence of external force, the engaging portion 422 cannot pass through the first opening end 231a and the opening slot 231, but abuts against the surfaces of the first elastic wall 20a and the second elastic wall 20b facing the cavity 22. Thus, the engagement between the engaging portion 422 and the first opening end 231a limits the position of the dust cover 40, preventing the dust cover 40 from falling off the sheath 20.

[0134] Exemplarily, the width of the clamping portion 422 in the second direction (x direction) can be greater than the width of the first opening end 231a of the opening groove 231 in the second direction, so that the clamping portion 422 will not fall off the sheath 20 through the first opening end 231a and the opening groove 231, but will abut against the first elastic wall 20a and the second elastic wall 20b of the sheath 20.

[0135] When the main optical fiber 10 needs to be replaced, an external force can be applied to the shell cover 41 of the dust cover 40 to cause the first elastic wall 20a and the second elastic wall 20b to undergo elastic deformation, and the clamping portion 422 can pass through the first opening end 231a and the opening groove 231, thereby removing the entire dust cover 40 from the sheath 20 and exposing the opening groove 231, so that the main optical fiber 10 can be replaced.

[0136] In an embodiment of the present application, the molding material of the sheath 20 can be a thermoplastic polymer material. The thermoplastic polymer material that has not been activated has no adhesion to the pressure-sensitive adhesive layer 30, and the bonding strength between the two is very weak, which can better ensure the reliability of the transmission cable 100 in scenarios such as winding and storage.

[0137] For example, the molding material of the sheath 20 may include fluoroplastics, thermoplastic polyurethanes (TPU), etc. Of course, in some other examples, the molding material of the sheath 20 may also be other types of thermoplastic materials. Alternatively, the molding material of the sheath 20 may also be other non-thermoplastic materials.

[0138] The molding material of the sheath 20 may also include a flame retardant material. For example, the molding material of the sheath 20 may be a fluoroplastic, so that the sheath 20 has flame retardant properties, thereby improving the flame retardant effect of the entire transmission cable 100, reducing the risk of flammability of the transmission cable 100, facilitating meeting the flame retardant requirements of indoor transmission cables 100, and improving the safety of the entire transmission cable 100.

[0139] The flame retardancy rating of the jacket 20 can meet the EN60332 standard. This standard requires that a 60cm long specimen be vertically fixed in a metal box with an open front wall. A propane burner with a flame length of 175mm is applied from a position 450mm from the upper fixed end of the specimen, with the flame cone contacting the cable at a 45-degree angle. The test passes if the burned portion of the specimen is no more than 50mm below the fixed end. This ensures that the jacket 20 has excellent flame retardancy, effectively ensuring the safety of the transmission cable 100 and reducing the risk of flammability.

[0140] The molding material of the pressure-sensitive adhesive layer 30 may include natural rubber, synthetic rubber, polyurethane, polyacrylate, silicone, etc.

[0141] In order to meet the demand for indoor open-line deployment of the transmission cable 100, the transmission cable 100 can also be a transparent transmission cable with low visibility, which can be easily invisible to improve the aesthetics of the cable deployment.

[0142] For example, the main optical fiber 10 may be a non-colored optical fiber, and the molding materials of the sheath 20 and the pressure-sensitive adhesive layer 30 may be transparent materials respectively.

[0143] It should be noted that the numerical values ​​and numerical ranges involved in this application are approximate. Due to the influence of the manufacturing process, there may be a certain range of errors. For example, the error value may be ±0.2 or ±0.1. Those skilled in the art may consider this part of the error to be negligible.

[0144] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. The terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A transmission cable, characterized in that: It comprises a main optical fiber (10), a sheath (20) and a pressure-sensitive adhesive layer (30), wherein the main optical fiber (10) is located inside the sheath (20); The outer surface of the sheath (20) comprises an activated bonding plane (21), the bonding plane (21) extends along a first direction, the first direction being the extension direction of the sheath (20), and the pressure-sensitive adhesive layer (30) is bonded and fixed on the bonding plane (21).

2. The transmission cable according to claim 1, characterized in that: The sheath (20) has a cavity (22) inside, and the main optical fiber (10) is movably arranged in the cavity (22); The outer surface of the sheath (20) further comprises a first side surface (23), an opening groove (231) is provided on the first side surface (23), and the first side surface (23) and the opening groove (231) extend respectively along the first direction; The open groove (231) is in communication with the cavity (22), and the open groove (231) is used to allow the main optical fiber (10) to pass through and be arranged in the cavity (22).

3. The transmission cable according to claim 2, characterized in that: The sheath (20) comprises a first elastic wall (20a) and a second elastic wall (20b) which are arranged opposite to each other along a second direction, and a gap is provided between the first elastic wall (20a) and the second elastic wall (20b) to form the open groove (231); The minimum width of the open groove (231) in the third direction is smaller than the diameter of the main optical fiber (10), and the third direction, the first direction, and the second direction are perpendicular to each other.

4. The transmission cable according to claim 3, characterized in that: The first side surface (23) and the bonding plane (21) are arranged opposite to each other in the third direction.

5. The transmission cable according to claim 3, characterized in that: It also includes a dust cover (40), wherein the dust cover (40) is disposed on the first side surface (23), and the dust cover (40) covers the opening groove (231).

6. The transmission cable according to claim 5, characterized in that: The opening groove (231) comprises a first opening end (231a) and a second opening end (231b) which are opposite to each other in the third direction, the first opening end (231a) being adjacent to the cavity (22), and the second opening end (231b) being located on the first side surface (23); The dust cover (40) comprises a connected shell cover (41) and a fixing member (42); the shell cover (41) abuts against the first side surface (23), and the shell cover (41) completely covers the second opening end (231b); and the fixing member (42) is engaged with the first opening end (231a).

7. The transmission cable according to claim 6, characterized in that: The fixing member (42) comprises a connecting portion (421) and a clamping portion (422) connected to each other; The connecting portion (421) is connected to the shell cover (41), and the clamping portion (422) is used to pass through the first opening end (231a) and extend into the cavity (22), and the clamping portion (422) is respectively abutted against a surface of the first elastic wall (20a) and a surface of the second elastic wall (20b) facing the cavity (22).

8. The transmission cable according to any one of claims 2 to 7, characterized in that: A first auxiliary groove (211) is provided on the bonding plane (21), and the first auxiliary groove (211) extends along the first direction.

9. The transmission cable according to any one of claims 2 to 7, characterized in that: The width of the cavity (22) in the second direction satisfies: L / (n*D)≤1.8, wherein L is the width of the cavity (22) in the second direction, n is the number of the main optical fibers (10), and D is the diameter of a single main optical fiber (10); The height of the cavity (22) in the third direction satisfies: H / (n*D)≤1, wherein H is the height of the cavity (22) in the third direction.

10. The transmission cable according to claim 1, characterized in that: The inner surface of the sheath (20) is in contact with the outer surface of the main optical fiber (10), and the sheath (20) wraps and fixes the main optical fiber (10).

11. The transmission cable according to claim 10, characterized in that: The outer surface of the sheath (20) further comprises a first side surface (23), wherein the first side surface (23) is arranged opposite to the bonding plane (21) in a third direction; The bonding plane (21) and the first side surface (23) are respectively provided with a first auxiliary groove (211) and a second auxiliary groove (232), and the first auxiliary groove (211) and the second auxiliary groove (232) respectively extend along the first direction.

12. The transmission cable according to any one of claims 1-7, 10 or 11, characterized in that: There are a plurality of main optical fibers (10), and the plurality of main optical fibers (10) are arranged at intervals at the center of the sheath (20).

13. The transmission cable according to any one of claims 2 to 7 or 11, characterized in that: The outer surface of the sheath (20) further comprises a second side surface (24) and a third side surface (25), wherein the second side surface (24) and the third side surface (25) extend along the first direction respectively; The second side surface (24) and the third side surface (25) are arranged opposite to each other in a second direction, and the second side surface (24) and the third side surface (25) are both connected to the bonding plane (21) and the first side surface (23).

14. The transmission cable according to any one of claims 1-7, 10 or 11, characterized in that: The molding material of the sheath (20) comprises a flame retardant material, and the flame retardant grade of the sheath (20) is flame retardant according to EN60332 standard.

15. The transmission cable according to any one of claims 1-7, 10 or 11, characterized in that: The transmission cable (100) is a transparent transmission cable.

16. A communication system, characterized in that: At least comprising a first communication device, a second communication device and a transmission cable (100) according to any one of claims 1 to 15; The first communication device and the second communication device are connected via the transmission cable (100).

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