METHOD FOR CONFIGURING AN OPTICAL FIBER COUPLING DEVICE AND DEVICE EXECUTING THE METHOD.

Abstract

The invention relates to a method for configuring a fiber optic coupling device (111) configured to operate in a fiber optic communication network (1) further comprising a fiber optic termination device (10), said method being carried out in said coupling device (111) and comprising obtaining at least one reference information field transmitted in a frame by said termination device (10), and being characterized in that it comprises a step of configuring said coupling device (111) according to a first configuration (C1) if at least one reference information field obtained includes a first predefined identifier (Id1) and in that it comprises a step of configuring said coupling device (111) according to a second configuration (C2) if at least one reference information field obtained includes a second predefined identifier (Id2). Figure to be published with the abstract: Fig. 2

Description

Title of the invention: METHOD FOR CONFIGURING AN OPTICAL FIBER COUPLING DEVICE AND DEVICE EXECUTING THE METHOD. technical field

[0001] The present invention relates to the field of passive optical fiber communication networks. More particularly, the invention relates to the configuration of an optical fiber coupling device operating on the user side (e.g., a subscriber) of an optical fiber communication network, according to the protocol(s) implemented by a termination device located on the operator side (e.g., a service provider) of that same communication network. PRIOR TECHNOLOGY

[0002] Passive fiber optic communication networks, including FTTH (Fiber To The Home) networks, are widely used to implement communication networks between service providers and users' premises. Various protocols exist to organize communication between the different equipment necessary for the operation of these communication networks, and these protocols are constantly evolving.

[0003] The XGS-PON standard (ITU-T G.9807.1) is considered an evolution of the XG-PON standard (ITU-T G.987). Both standards are designed to provide services operating at a downstream communication rate of up to 10 Gbit / s. An XG-PON system, namely an OLT (Optical Line Termination) type termination device connected to an ONU (Optical Network Unit) type device, is capable of providing rates of up to 10 Gbit / s downstream and up to 2.5 Gbit / s upstream. An XGS-PON system, namely an OLT (Optical Line Termination) type termination equipment connected to an ONU (Optical Network Unit) type equipment, is capable of providing speeds of up to 10 Gbits / s downstream and up to 10 Gbits / s upstream.

[0004] Some networks are homogeneous, in that all the equipment (OLT termination equipment, on the operator side, and ONU coupling equipment, on the user side) is of the XG-PON type, or all the equipment (OLT and ONU) is of the XGS-PON type. Other PON communication networks are called "hybrid," that is, some OLT termination equipment operates according to an XGS-PON protocol (or standard) and other OLT termination equipment operates according to a XG-PON protocol. Therefore, there is a need to be able to deploy user-side ONU coupling equipment that is compatible with both XG-PON and XGS-PON protocols. Furthermore, an ONU coupling device must never be integrated into a PON (Passive Optical Network) communication network using a maximum transmission speed lower than its maximum usable transmission speed. Unfortunately, some ONU coupling devices are initially configured (at the time of manufacture) at the factory to use the XG-PON protocol, or even to use the XGS-PON protocol. In such cases, an ONU coupling device may automatically integrate into a communication network by operating according to the first protocol it detects as being implemented in the network, which is not necessarily the highest-performing protocol implemented in the network.

[0005] The situation can be improved. Description of the invention

[0006] An object of the present invention is to propose a method for configuring a fiber optic coupling device configured to operate in a fiber optic communication network, the network further comprising a fiber optic termination device and a fiber optic distribution device, the coupling device being capable of communicating with the termination device via the distribution device, the method being carried out in (and by) the coupling device and the method comprising obtaining at least one reference information field emitted by the termination device,and comprising a step of configuring the coupling device according to a first configuration if at least one obtained reference information field includes a first predefined identifier, and in that it comprises a step of configuring the coupling device according to a second configuration if at least one obtained reference information field includes a second predefined identifier.

[0007] Advantageously, this allows a hybrid fiber optic coupling device, installed at a user's premises, to determine the type or types of protocols supported by a network termination equipment of the operator to which it is connected and then to configure or reconfigure itself accordingly to operate according to the best possible protocol.

[0008] According to one embodiment, the step of configuring the optical fiber coupling device according to the first configuration configures the coupling device so that it is capable of operating communications according to a first protocol implemented by the optical termination equipment, and the step of configuring the optical fiber coupling device according to the second configuration configures the device optical fiber coupling so that it is able to operate communications according to a second protocol implemented by the optical termination equipment, the second protocol being different from the first protocol.

[0009] According to one embodiment, the steps of obtaining at least one reference information field and of configuring the coupling device according to the first or according to the second configuration are subsequent to a physical synchronization step of a physical layer of the first protocol or of a physical layer of the second protocol, and prior to a phase of acquiring an identifier of said coupling device.

[0010] According to one embodiment, said at least one reference information field obtained according to the method is an Alloc-Id type field as defined according to the ITU-T G.987 communication standard, according to the ITU-T G.9807.1 communication standard, or one of their evolutions, the first predefined identifier is the numeric value 1022 and the second predefined identifier is the numeric value 1023.

[0011] According to one embodiment, said steps of obtaining at least said one reference information field and of configuring the coupling device according to said first or said second configuration of the process are subsequent to a physical synchronization step with PHY reference communication frames as defined according to the ITU-T G.987 communication standard or according to the ITU-T G.9807.1 communication standard, and prior to a serial number acquisition phase as defined according to the ITU-T G.987 communication standard or according to the ITU-T G.9807.1 communication standard.

[0012] According to one embodiment, the method comprises obtaining at least one first reference information field emitted by the termination equipment, the at least one first reference information field comprising said first identifier, and the method further comprises obtaining at least one second reference information field comprising the second identifier; the method being such that the configuration step operates a configuration of the coupling device according to the second configuration.

[0013] Another object of the invention is a fiber optic coupling device configured to operate in a fiber optic communication network, the network further comprising fiber optic termination equipment and fiber optic distribution equipment, said coupling device being configured to communicate with the termination equipment via the distribution equipment, the coupling device comprising electronic circuitry configured to obtain at least one reference information field emitted by the termination equipment, and further comprising electronic circuitry configured to perform a configuration step of the coupling device according to a first configuration if at least one obtained reference information field includes a first predefined identifier and in that it includes a coupling device configuration step according to a second configuration if at least one obtained reference information field includes a second predefined identifier.

[0014] According to one embodiment, the optical fiber coupling device includes electronic circuitry configured to perform the coupling device configuration step according to the first configuration to configure the coupling device so that it is capable of performing communications according to a first protocol implemented by the optical fiber termination equipment, and includes electronic circuitry to perform the coupling device configuration step according to the second configuration to configure the coupling device so that it is capable of performing communications according to a second protocol implemented by the optical fiber termination equipment, the second protocol being different from the first protocol.

[0015] According to one embodiment, the optical fiber coupling device further includes electronic circuitry configured so that the steps of obtaining at least one reference information field and of configuring the coupling device according to said first configuration or according to the second configuration are subsequent to a physical synchronization step of a physical layer of the first protocol or a physical layer of the second protocol, and prior to a phase of acquiring an identifier of the coupling device.

[0016] According to one embodiment, the optical fiber coupling device comprises electronic circuitry configured to perform reception and processing of said at least one reference information field of type Alloc-Id as defined according to the ITU-T G.987 communication standard, according to the ITU-T G.9807.1 communication standard, or according to one of their evolutions, and to perform detection of a first predefined identifier of numeric value 1022 and / or a second predefined identifier of numeric value 1023 in the at least one reference information field.

[0017] According to one embodiment, the optical fiber coupling device further comprises electronic circuitry configured to perform the steps of obtaining at least one reference information field and the step of configuring the coupling device according to the first configuration or according to the second configuration subsequent to a synchronization step with PHY reference communication frames as defined according to the ITU-T G.987 communication standard, or according to the ITU-T G.9807.1 communication standard, or one of their evolutions, and prior to a serial number acquisition phase. as defined according to the ITU-T G.987 communication standard, the ITU-T G.9807.1 communication standard, or according to one of their evolutions.

[0018] The invention also relates to a communication network comprising an optical fiber coupling device as described above.

[0019] Another object of the invention is a computer program product comprising program code instructions for executing steps of the process as previously described when the program is executed by a processor of a fiber optic coupling device, as well as an information storage medium comprising a computer program product as described above. Brief description of the drawings

[0020] The features of the invention mentioned above, as well as others, will become clearer upon reading the following description of at least one exemplary embodiment, said description being made in relation to the accompanying drawings, among which:

[0021] [Fig-1] illustrates a PON-type telecommunications network comprising a ONU type optical coupling device according to an embodiment;

[0022] [Fig.2] is a flowchart illustrating an improved configuration method for a optical coupling device, according to a first embodiment;

[0023] [Fig.3] is a flowchart illustrating an improved configuration method for a optical coupling device, according to a second embodiment; and,

[0024] [Fig.4] is a diagram illustrating an example of the internal architecture of a device of ONU type optical coupling, according to one embodiment.

[0025] DETAILED DESCRIPTION OF IMPROVEMENTS

[0026] Figure 1 illustrates a PON-type communication network 1. The communication network 1 comprises an OLT termination device 10 and an ODN distribution device 11 connected to the OLT termination device 10 via a communication link 11'. The ODN distribution device 11 allows data to be transmitted from the OLT device 10 to user equipment, which are ONU fiber optic coupling devices 111, 112, and 113, and vice versa. The fiber optic coupling device 111 is connected to the ODN distribution device 11 via a communication link 111'. The fiber optic coupling device 112 is connected to the ODN distribution device 11 via a communication link 112'. The fiber optic coupling device 113 is connected to the ODN distribution device 11 via a communication link 113'.The communication links are bidirectional, and the equipment and devices are each designed and configured to operate bidirectional communications. Naturally, the number of OLT, ODN, and ONU devices present in the... A PON communication network can be much larger, but the example described only shows a limited number of equipment and devices for the sake of simplicity.

[0027] In a PON-type network, such as communication network 1, for an optical coupling ONU to be operational, it must first be activated by the OLT termination equipment to which it is connected in the communication network. For example, the activation process described by the XG-PON standard (as described in one of its versions, for example in ITU-T Recommendation G.987, June 2012) or by the XGS-PON standard (as described in one of its versions, for example in ITU-T Recommendation G.9807.1, February 2023) comprises three main phases: synchronization, acquisition by the OLT of an identifier of the optical fiber coupling device concerned, such as, for example, the serial number of the device concerned, and then a distance measurement.

[0028] Cleverly, and according to at least one embodiment, as soon as synchronization of a fiber optic coupling device is established with downstream PHY frames, the relevant ONU reads the contents of a predetermined data field (also referred to here as the reference information field) available in a header of each of the data frames transmitted by the OLT equipment to which it is connected. This reading is performed at the level of the PON driver of the MAC communication layer of the relevant ONU coupling device.

[0029] In the following description, we consider as an example an integration of the optical coupling device ONU 111 in the communication network 1 of type PON. In one embodiment, the reference information field is of type Alloc-Id as defined by the ITU-T G.987 communication standard, or by the ITU-T G.9807.1 communication standard, or by an evolution of one of these standards, such as, for example, NG2-PON technology, NG-EPON technology, G.hsp.x technology, or 25GS-PON technology, for example, version 3.0 from the MSA Group (www.25gspon-msa.org), or 50G-PON technology, for example, as defined by ITU-T Recommendation G.9804.3 (2021 Amd. 2 (03 / 2024)). This reference information field (or frame) may be present in multiple instances in a data frame transmitted by an OLT-type termination device to one or more ONU-type coupling devices.Each of these reference information fields includes an identifier for one or more ONU-type fiber coupling devices. Furthermore, a first identifier Idl is the numerical value 1023 and a second identifier Id2 is the numerical value 1022. Ingeniously, according to one embodiment, the optical fiber coupling device 111 uses the Alloc-Id information to announce itself. as an XG-PON type ONU device or as an XGS-PON type ONU device with the OLT 10 of the communication network 1 to which it is connected at a given time.

[0030] To this end, the optical fiber coupling device 111 listens to the frames received by the OLT 10, after physical synchronization between the OLT terminator 10 and the optical fiber coupling device 111, and in particular to the BWmap information fields, as defined according to the XG-PON standard and the XGS-PON standard (and as proposed, for example, in clause C.8.1.1.2 of ITU-T Recommendation G.9807.1 of February 2023). These frames are transmitted every 125 microseconds. If, among these frames, the optical fiber coupling device 111 detects only frames containing an Alloc-Id with an Idl identifier of the numeric value 1023, then the optical fiber coupling device 111 determines that the OLT terminator 10 is presenting it with an XG-PON type network.If, however, the optical fiber coupling device 111 only detects frames containing an Alloc-Id field with an Id2 identifier of the numerical value 1022, then the optical fiber coupling device 111 determines that the OLT termination equipment 10 is presenting it with an XGS-PON type network. Finally, if the optical fiber coupling device 111 detects frames containing an Alloc-Id field with an Id1 identifier of the numerical value 1023 and also frames containing an Alloc-Id field with an Id2 identifier of the numerical value 1022, then the optical fiber coupling device 111 determines that the OLT termination equipment 10 is presenting it with a hybrid type network compatible with ONUs implementing an XG-PON protocol and with ONUs implementing an XGS-PON protocol.

[0031] Advantageously, the ONU can thus choose the most suitable protocol and reconfigure itself according to this best protocol, in this case the XGS-PON protocol, which is the most efficient in that it allows for the highest data rates. It is therefore possible that an ONU pre-configured at the factory with the least efficient protocol will not remain permanently configured in this way in a hybrid network, but will reconfigure itself according to the best protocol (here XGS-PON among XG-PON and XGS-PON).

[0032] Advantageously, a listening operation can be repeated a predetermined number of times. Indeed, the transmission frequency of frames containing the Alloc-Id information fields is the same as that of the 250-microsecond silence windows recommended in such a PON communication network, which an OLT device opens to allow ONU devices to integrate into the communication network. It is therefore necessary to eliminate uncertainties regarding the ability to obtain reference information such as the desired Alloc-Ids. For example, for a listening operation with a duration Tl of 5 seconds facing a For OLT equipment that opens a silence window every 5 seconds, the listening operation should be repeated twice, which guarantees the detection of at least one Alloc-Id type information from the OLT equipment 10, which guarantees the detection of at least one Alloc-Id type reference information field presenting one and / or the other of the identifiers Id1 and Id2. At the end of the listening period for frames containing successively transmitted reference information fields, the optical fiber coupling device 111, which is a hybrid device that can be compatible with the XG-PON protocol and with the XGS-PON protocol (as proposed for example in clause C.6.1.1 of the document ITU-T Recommendation G.9807).February 1, 2023) will choose its operating mode from among those operational whose implementation, use, or configuration it has been able to detect by the OLT termination equipment, and will then proceed with its activation via a standardized process, notably by acquiring an identifier from the coupling device.

[0033] It should be noted that an OLT-type termination device offers ONU-type fiber optic coupling devices that have not yet joined the communication network the opportunity, via Alloc-Id identifiers 1022 and 1023, to announce their serial number during a predefined time window. Thus, during this time window, an OLT-type termination device scans for any serial numbers it receives in order to initiate a negotiation phase aimed at conditionally accepting an ONU-type device announcing itself to it.

[0034] Several operating modes can be used to achieve this, depending on the software and hardware capabilities of the ONU 111 type optical fiber coupling device. Thus, the optical fiber coupling device 111 can simply respond to the next allocation provided by the OLT 10 equipment for acquiring a coupling device identifier corresponding to the highest-performing operating mode it detected among XG-PON and XGS-PON. However, the optical fiber coupling device 111 can also configure its MAC layer, known as PON MAC, by performing a software reconfiguration without requiring a reboot that includes resetting the internal electronic circuitry (hardware). Finally, a hardware reboot may be necessary to apply the new configuration C1 or C2 (detailed later in this description).

[0035] Figure 2 is a flowchart illustrating a device configuration method. hybrid optical fiber coupling device 111 of communication network 1 according to one embodiment. A step S10 is an initialization step at the end of which all PON-type equipment of communication network 1 is normally operational, except for the optical fiber coupling device 111 which is being activated in communication network 1. At the end of step S10, the The optical fiber coupling device 111 is synchronized with PHY frames transmitted by the OLT termination equipment 10. This implies that an optical signal is correctly received by the optical fiber coupling device 111 from the OLT termination equipment 10 via the ODN distribution equipment 11. A "PHY" frame is a physical frame referring to the structure of the data transmitted at the physical layer used for data transmission between the OLT and an ONU. The physical layer ensures the synchronization, integrity, and management of the data transmitted via the optical link between an OLT and an ONU.

[0036] During a SU step, the optical fiber coupling device 111 listens to frames containing information fields transmitted by the OLT termination equipment 10 and scans these frames for a predetermined duration to detect at least one information field, referred to as the reference information field, namely a "BWmap" type field that determines which protocol, XG-PON or XGS-PON, is used by the OLT equipment. The optical fiber coupling device 111 specifically scans the Alloc-Id information fields defined according to the aforementioned protocols and, during an S12 step, after receiving information transmitted in the reference information field, determines whether the information contained in the Alloc-Id field has the numerical value 1022.If the Alloc-Id received has the numerical value 1022 (step S12, "yes"), then the optical fiber coupling device 111 configures or reconfigures itself according to a C2 configuration during a step S13. Conversely, if the Alloc-Id received does not have the numerical value 1022 (step S12, "no"), then the optical fiber coupling device 111 checks whether the Alloc-Id has the value 1023 during a step S14. If the Alloc-Id received has the numerical value 1023 (step S14, "yes"), then the optical fiber coupling device 111 configures or reconfigures itself according to a C1 configuration during a step S15. Otherwise, the process loops back to step SI 1 with a new search for a BWmap reference information field according to the XG-PON protocol or according to the XGS-PON protocol.Configuration C1 includes all the parameters and internal register values ​​necessary for the operation of the fiber optic coupling device 111 according to the XG-PON protocol. Configuration C2 includes all the parameters and internal register values ​​necessary for the operation of the fiber optic coupling device 111 according to the XG-PON protocol.

[0037] Figure 3 illustrates a variant embodiment of the embodiment already described in relation to Figure 2. The embodiment described here comprises an iteration The search (or scanning) loop for BWmap reference information fields is repeated a predetermined number of times. An S20 step corresponds to an initialization step at the end of which all equipment in the PON communication network 1 is normally operational, except for the optical fiber coupling device 111, which is being activated in the communication network 1. Then, during an S21 step, the optical fiber coupling device 111 checks if it is synchronized with PHY frames transmitted by the OLT termination equipment 10. This implies that an optical signal is correctly received by the optical fiber coupling device 111 from the OLT termination equipment 10 via the ODN distribution equipment 11.If the optical fiber coupling device 111 is synchronized with PHY frames transmitted by the OLT termination equipment 10 (step S21, "yes"), the process continues sequentially by initializing an information retrieval iteration counter during step S22. If the optical fiber coupling device 111 has not yet synchronized with the PHY frames transmitted by the OLT termination equipment 10 (step S21, "no"), the process loops back to step S21, awaiting future synchronization. Following the initialization of the iteration counter during step S22, a BWmap information retrieval is performed by the optical fiber coupling device 111 during step S23 for a predetermined duration Tl. This duration Tl is, for example, 5 seconds. Depending on the variant, this duration Tl can be greater than or less than 5 seconds.During this scan at step S23, the optical fiber coupling device 111 searches for an Alloc-Id reference information field. If it then detects, at step S24, an Alloc-Id reference information field with a numeric value identifier equal to 1022 (step S24, "yes"), then the optical fiber coupling device 111, at step S25, configures its internal circuits according to a C2 configuration comprising all the parameters and values ​​of internal registers useful for the operation of the optical fiber coupling device 111 to operate according to the XGS-PON protocol, and then the process continues sequentially with a phase of acquiring an identifier of the optical fiber coupling device 111, such as the acquisition of a serial number or a unique identifier, according to the standardized process.Conversely, if a reference information field with the numerical value 1022 is not detected at step S24 (step S24, "no"), then the optical fiber coupling device 111 checks during a comparison step S241 whether the current iteration of the listening (or scanning) step is the last in the sequence of listening steps to be performed. If the current listening step iteration is not the last (step S241, "no"), then the process increments a counter n of iterations performed during a step. S242 then loops back to step S23 to perform an additional listening iteration. If the listening step iteration is the last to be performed, given the predefined maximum number of iterations (step S241, "yes"), it is checked in step 243 whether an Alloc-Id information with a numeric value identifier of 1023 has been received by the optical fiber coupling device 111. If so (step S243, "yes"), then the optical fiber coupling device 111, in step S26, configures its internal circuits according to a configuration Cl comprising all the parameters and internal register values ​​useful for the operation of the optical fiber coupling device 111 to operate according to the XG-PON protocol, and then the process continues sequentially with a serial number acquisition phase, according to the standardized process.Conversely, if a reference information field with the numerical value 1023 is not detected at step S243 (step S243, "no"), then the process loops back to step S22 to initiate a new sequence of iterations for searching for reference information fields, as described above. The numerical values ​​1023 and 1022 are cleverly and respectively considered and used here as Idl and Id2 identifiers, allowing a hybrid optical fiber coupling device, such as optical fiber coupling device 111, to be informed of the protocol(s) supported by an OLT device to which it is connected, among the XG-PON and XGS-PON protocols.

[0038] According to other embodiments, the Alloc-Id reference information field may contain identifiers with other specific numeric values, different from the numeric values ​​1022 and 1023. For example, one of these values ​​may be associated with (and representative of) another protocol or standard that may be used in the communication network, in addition to the XG-PON and XGS-PON standards and protocols. These specific values ​​may, for example, fall within the range of values ​​[1024; 16383]. Thus, according to these embodiments, the optical fiber coupling device 111, which is hybrid in the sense that it is compatible with several communication standards or protocols, is configured to efficiently determine which standard or protocols are used by the optical termination equipment OLT 10.

[0039] Figure 4 schematically illustrates an example of the internal architecture of the optical fiber coupling device 111. For illustrative purposes, Figure 4 illustrates an internal arrangement of the optical fiber coupling device 111. It should be noted that Figure 4 could also represent an internal architecture of the optical fiber coupling devices 112 and 113, or even of the OLT device 10. According to the hardware architecture example shown in Figure 4, the optical fiber coupling device 111 comprises, connected by a communication bus 120: a processor or CPU (Central Processing Unit) 101; and random access memory. RAM (Random Access Memory) 102; a read-only memory ROM (Read Only Memory) 103; a storage unit such as a hard disk drive (or a storage media reader, such as an SD card reader (Secure Digital) 104; at least one communication interface 105 enabling the optical fiber coupling device 111 to communicate with other devices to which it is connected, such as communication devices of the PON communication network 1.

[0040] The processor 101 is capable of executing instructions loaded into RAM 102 from ROM 103, external memory (not shown), a storage medium (such as an SD card), or a communication network. When the optical fiber coupling device 111 is powered on, the processor 101 is capable of reading instructions from RAM 102 and executing them. These instructions form a computer program causing the processor 101 to implement all or part of a method described in relation to [Fig. 2] or described variants of this method, such as, for example, the method described in relation to [Fig. 3].

[0041] All or part of the method described in relation to [Fig. 2] or its described variants can be implemented in software form by executing a set of instructions by a programmable machine, for example a DSP (Digital Signal Processor) or a microcontroller, or be implemented in hardware form by a dedicated machine or component, for example a FPGA (Field-Programmable Gate Array) or an ASIC (Application-Specific Integrated Circuit). In general, the optical fiber coupling device 111 comprises electronic circuitry configured to implement the methods described in relation to itself.Obviously, the optical fiber coupling device 11 I also includes all the elements usually present in a system comprising a control unit and its peripherals, such as, a power supply circuit, a power supply monitoring circuit, one or more clock circuits, a reset circuit, input / output ports, interrupt inputs, bus drivers, this list being non-exhaustive.

Claims

Demands

1. A method for configuring a fiber optic coupling device (111) configured to operate in a fiber optic communication network (1), said network (1) further comprising a fiber optic termination device (10) and a fiber optic distribution device (11), said coupling device (111) being capable of communicating with said termination device (10) via said distribution device (11), said method being carried out in said coupling device (111) and said method comprising obtaining at least one reference information field emitted by said termination device (10), and being characterized in that it comprises a step of configuring said coupling device (111) according to a first configuration (Cl) if at least one reference information field obtained includes a predefined first identifier (Idl),and in that it includes a step of configuring said coupling device (111) according to a second configuration (C2) if at least one reference information field obtained includes a second predefined identifier (Id2).

2. A configuration method according to claim 1, wherein the configuration step of said coupling device (111) according to the first configuration (C1) configures said coupling device (111) to be capable of operating communications according to a first protocol implemented by said optical fiber termination equipment (10), and wherein the configuration step of said coupling device (111) according to the second configuration (C2) configures said coupling device (111) to be capable of operating communications according to a second protocol implemented by said optical fiber termination equipment (10), the second protocol being different from the first protocol.

3. A configuration method according to claim 2, wherein said steps of obtaining said at least one reference information field and configuring said coupling device according to said first or said second configuration are subsequent to a physical synchronization step of a physical layer of the first protocol or a physical layer of the second protocol, and prior to an acquisition phase of an identifier of said coupling device (111).

4. A configuration method according to any one of claims 1 to 3, wherein said at least one reference information field obtained is an Alloc-Id type field as defined according to the ITU-T G.987 communication standard, according to the ITU-T G.9807.1 communication standard, or any of their evolutions, said first predefined identifier is the numeric value 1023 and said second predefined identifier is the numeric value 1022.

5. A configuration method according to any one of claims 1 to 4, the method comprising obtaining at least one reference information field emitted by said termination equipment (10), said at least a first reference information field comprising said first identifier (Idl), and further comprising obtaining at least a second reference information field comprising said second identifier (Id2), the method being such that said configuration step performs a configuration of said coupling device according to said second configuration (C2).

6. Fiber optic coupling device (111) configured to operate in a fiber optic communication network (1), said network (1) further comprising fiber optic termination equipment (10) and fiber optic distribution equipment (11), said coupling device (111) being configured to communicate with said termination equipment (10) via said distribution equipment (11), said coupling device (111) comprising electronic circuitry configured to obtain at least one reference information field emitted by said fiber optic termination equipment (10), and further comprising electronic circuitry configured to perform a configuration step of said fiber optic coupling device (111) according to a first configuration (Cl) if at least one reference information field obtained includes a predefined first identifier (Idl),and in that it includes a step of configuring said coupling device (111) according to a second configuration (C2) if at least one reference information field obtained includes a second predefined identifier (Id2).

7. Optical fiber coupling device (111) according to claim 6, comprising electronic circuitry configured to operate the configuration step of said coupling device (111) according to the first configuration (C1) to configure said coupling device (111) so that it is capable of operating communications according to a first protocol implemented by said optical fiber termination equipment (10) and comprising electronic circuitry to operate the configuration step of said coupling device (111) according to the second configuration (C2) to configure said coupling device (111) so that it is capable of operating communications according to a second protocol implemented by said optical fiber termination equipment (10), the second protocol being different from the first protocol.

8. Optical fiber coupling device (111) according to claim 6 or 7, further comprising electronic circuitry configured such that said steps of obtaining said at least one reference information field and of configuring said coupling device according to said first configuration (C1) or according to said second configuration (C2) are subsequent to a physical synchronization step of a physical layer of said first protocol or of a physical layer of said second protocol, and prior to an acquisition phase of an identifier of said coupling device (111).

9. Optical fiber coupling device (111) according to any one of claims 6 to 8, comprising electronic circuitry configured to perform reception and processing of said at least one reference information field of type Alloc-Id as defined according to the ITU-T G.987 communication standard, according to the ITU-T G.9807.1 communication standard, or any of their evolutions, and to perform detection of a first predefined identifier of numeric value 1023 and / or a second predefined identifier of numeric value 1022 in said at least one reference information field.

10. A device according to any one of claims 6 to 9, comprising electronic circuitry configured to perform said steps of obtaining at least one reference information field and said step of configuring said coupling device according to said first or second configuration subsequent to a step of physical synchronization with reference communication frames (PHY) as defined in the

11.

12.

13. ITU-T G.987 communication standard, according to the ITU-T G.9807.1 communication standard, or one of their evolutions, and prior to a serial number acquisition phase as defined according to the ITU-T G.987 communication standard, the ITU-T G.9807.1 communication standard, or one of their evolutions. Communication network comprising at least one optical fiber coupling device according to any one of claims 6 to 10. Product computer program characterized in that it comprises program code instructions to execute the steps of the process according to any one of claims 1 to 5, when said program is executed by a processor of an optical fiber coupling device. Information storage medium comprising a computer program product according to the preceding claim.

Images