Method for routing data in an optical access network, selector, optical line termination equipment, corresponding computer program product

Abstract

Data routing method in an optical access network, selector, optical line termination equipment, corresponding computer program product. The invention relates to a data routing method (Data) intended to be implemented by an optical access network comprising at least one multi-port optical line termination device, a point-to-point connection between a first port of the optical line termination device and a point-to-point optical network unit (PtP ONU) allowing point-to-point connectivity of a first client and a point-to-multipoint connection between a second port of the optical line termination device and at least one point-to-multipoint optical network unit (PON ONU) allowing point-to-multipoint connectivity of a plurality of second clients including at least one second client.The process includes: routing (11) data from the first customer using point-to-point connectivity, routing (12) data from the second customer using point-to-multipoint connectivity, and, with the first and second customers forming a single customer: a first switchover (13, Y) from the routing of the customer's data using the primary point-to-point connectivity to routing using the secondary point-to-multipoint connectivity, based (13) on at least one first operating indicator (indicPtP) of the point-to-point connection to obtain dual customer access. Figure 3 for the abbreviation.

Description

Description Title of the invention: Method for routing data in an optical access network, selector, optical line termination equipment, corresponding computer program product Scope of the invention

[0001] = The field of the invention is that of optical telecommunication (by fiber optical) and optical access networks including a "optical network" type component passive” (PON, “Passive Optical Network”). Within this field, the invention is relates more specifically to a data routing process intended for a such an optical access network. It applies in particular to termination equipment of optical line.

[0002] = A passive optical network (PON) designates a principle of transport using optical fiber used in optical access networks (FTTx, "Fiber To The x"). It is characterized by a passive point-to-multipoint fiber architecture (multiple users share a single connection) (same fiber optic cable and there is no active equipment between the exchange and the subscribers) enabling point-to-multipoint connectivity, there are different network standards PON, including GPON (ITU-T G.984 standard), XGS-PON (ITU-T standard G.9807), NG-PON2 (ITU-T G.989 standard), HS-PON (ITU-T G.9804 standard), etc. These different access networks are called PON networks or PON-type networks. Anterior artery

[0003] — An optical access network with a PON-type portion, schematically illustrated by [Fig.1] and [Fig.2] include optical line termination (OLT) equipment. "Optical Line Termination") which is connected on one side to network units optical (ONU, "Optical Network Units") called PON ONU via one or more networks point-type optical distribution network (ODN) multipoint allowing point-to-multipoint connectivity and other parts at least an optical network unit (ONU) point-to-point (PtP) via a single-customer dedicated fiber enabling point-to-point connectivity.

[0004] The OLT equipment is the network-side termination equipment providing the interface with dedicated optical fibers and with optical fibers from one or more networks ODN. In France, it is generally located in the optical connection node. (NRO) and often located in a so-called central building. I] traditionally has a chassis with cards, PON Card, PtP Card, each containing ports optical. An optical port can address several dozen clients, commonly 64, via an ODN network which includes a splitter / combiner (S / C) 1! :N (one to N). An OLT system can, for example, include more than a hundred Optical ports are each connected to an ODN to address several thousand ONUs, with the restriction that one or more optical ports may be reserved for one or more PtP ONUs for point-to-point connectivity. Typically, at least one card with multiple optical ports is dedicated to PtP ONUs. Each ONU unit provides the user-side interface. It converts the optical signal received via an optical fiber into an electrical signal sent to a customer. It is also sometimes called an "Optical Network Termination" (ONT). Each ODN network provides the optical transmission medium for the physical connection of a plurality of ONU units, known as PON ONUs, to the OLT equipment, with a range limited, for example, to 20 km. The ODN network provides the optical channel for the transmission of optical signals between the OLT and the PON ONUs in both the downlink and uplink directions. A given ODN network therefore establishes a transmission channel between the given port of the OLT equipment and each of the addressed ONU PON units, used both in the downstream direction (referenced "D" on [Fig.1] for "downstream", i.e. "OLT to ONU PON") and in the upstream direction (referenced "U" on [Fig.1] for "upstream", i.e. "ONU PON to OLT"). Although an optical fiber is generally dedicated to a single direction, either downstream or upstream, in the core network, a single optical fiber is used for both downstream and upstream in the case of a PON access network between the OLT and a splitter point, also known as a shared access point. This shared access point corresponds, in the downstream direction, to the splitting of the optical fiber into several optical fibers implemented by a splitter (S / C), and in the upstream direction, to the regrouping of optical fibers from the different PON ONUs into a single fiber implemented by the same device, called a combine (S / C). This splitter / combiner device is passive; it divides the downstream signal power into an equal number of output optical fibers. Depending on deployment constraints, several splitters / combiners may be used sequentially. The concept of customer covers residential customers, business customers, companies, and radio (mobile) sites connected via fiber optics. Dedicated fiber optic is generally reserved for serving a radio site or for serving a business due to its installation cost. As with [Fig.1], the optical access network schematically illustrated by [Fig.2] includes a PON part and a part with an optical fiber dedicated to a single customer. The PON section connects a port, the PON port, of the OLT equipment to multiple clients using point-to-multipoint connectivity. This section includes a primary optical fiber, a splitter / combiner (S / C), a plurality of secondary optical fibers, and a plurality of PON ONUs. The primary fiber connects a port, the PON port, to the splitter / combiner. The plurality of secondary fibers connect The spark gap / combiner S / C has a plurality of ONU PONs. Each ONU PON serves one customer. The customer-dedicated fiber connects a port, PtP port, to a SW gateway (cell site gateway / Ethernet switch) via a PtP ONU to serve that customer. Dedicated fiber serves a single customer via point-to-point connectivity. This customer, whether a business or a radio site, requires very high service availability, i.e., connectivity close to permanent availability. For various reasons, a break may occur in the connection between the OLT equipment and the customer. Such a break may result, in particular, from a break in the dedicated fiber, a failure in the PtP ONU, etc. To increase the reliability of service availability for the customer, one solution involves a dual customer connection using a second dedicated fiber, ideally with different infrastructure equipment (fiber cable, cable tray, boxes, optoelectronic cards, electronic boards, etc.). However, this solution is very expensive. Description of the invention The invention offers a double supply solution that is less expensive than the prior art. The invention relates to a data routing method intended to be implemented by an optical access network comprising at least one multi-port optical line termination device, a point-to-point connection between a first port of the optical line termination device and a point-to-point optical network unit enabling point-to-point connectivity for a first client, and a point-to-multipoint connection between a second port of the optical line termination device and at least one point-to-multipoint optical network unit enabling point-to-multipoint connectivity for a plurality of second clients, each including at least one second client. This method comprises: data routing from the first customer according to point-to-point connectivity point, data routing from the second client according to multipoint connectivity tipoints and And, since the first customer and the second customer form a single customer, the process further includes: an initial switchover of customer data routing according to the primary point-to-point connectivity to a routing according to the secondary point-to-multipoint connectivity, based on at least one first point-to-point connection operation indicator to obtain a double customer supply. The invention further relates to an optical access network comprising at least one optical line termination device, a point-to-point connection between a first port of the optical line termination device and a point-to-point optical network unit for routing data from a first client via point-to-point connectivity, and a point-to-multipoint connection between a second port of the optical line termination device and at least one point-to-multipoint optical network unit for routing data from a plurality of second clients, each including at least one other client, via point-to-multipoint connectivity. Since the first client and the at least one second client constitute a single client, this access network further comprises: a routing selector connected to the customer, to the optical network unit point-to-point and point-to-multipoint optical network unit for switching the routing of customer data according to so-called point-to-point connectivity primary to a routing according to point-to-multipoint connectivity, known as se- secondary, based on at least one initial indicator of the functioning of the point-to-point connection to obtain a double supply to the customer. The invention further relates to a routing selector intended to be connected to a customer, intended to be connected to a point-to-point optical network unit for a point-to-point connection between a first port of an optical line termination device of an optical access network and the customer to route customer data via point-to-point connectivity, and intended to be connected to a point-to-multipoint optical network unit for a point-to-multipoint connection between a second port of the optical line termination device and at least one other customer to route customer data via point-to-multipoint connectivity. This selector is capable of switching from routing customer data via primary point-to-point connectivity to routing via secondary point-to-multipoint connectivity based on at least one indicator of the point-to-point connection's operation, thus providing dual customer access. The invention further relates to a multi-port optical line termination device for an optical access network, intended to be connected to a point-to-point optical network unit via a first port to carry data from a first client via point-to-point connectivity, and intended to be connected to a plurality of point-to-multipoint optical network units via a second port for transmitting data from a plurality of second clients including the first client via point-to-multipoint connectivity. This device is adapted to switch the routing of data from the first client via point-to-point connectivity to routing via point-to-multipoint connectivity based on at least one first indicator of point-to-point connectivity operation. Thus, according to the invention, in the event of a failure of the primary point-to-point connection, the customer can be advantageously served via the secondary point-to-multipoint connection. The customer is connected first via point-to-point connectivity and, as a backup, via point-to-multipoint connectivity. The connection via the secondary point-to-multipoint connection thus provides a backup mode for the primary point-to-point connection. The switchover between the two modes can occur via a switch between the two types of connectivity depending on the performance of the primary point-to-point connection. An OLT port connected to a primary point-to-point connection is thus backed up by another OLT port connected to a secondary point-to-multipoint connection. According to one embodiment of the invention, the at least first operating indicator is a performance indicator relating to an Ethernet-type data routing protocol. According to one embodiment of the invention, the at least first indicator of operation relates to a so-called physical protocol layer of data transmission. According to one embodiment, the invention further includes a second switching of customer data routing via secondary multipoint connectivity to routing via primary point-to-point connectivity, based on at least a second point-to-point connection operation indicator. In this mode, if the primary point-to-point connection returns to satisfactory operation, the data flow is switched from routing via the secondary point-to-multipoint connection to routing via the primary point-to-point connection. The operational indicator used to decide on the switchover is typically related to the performance of the primary point-to-point connection. This operational indicator ensures that connectivity can be restored via the primary point-to-point connection. According to one embodiment, the same operating indicator is used for the first and second switching. According to one embodiment, the invention further comprises: routing of data from multiple secondary clients depending on of a data classification, of a point-to-point connection parameterization point and multipoint connection settings. In this mode, data destined for the second client is routed using point-to-multipoint backup connectivity, taking into account a traffic classification of the second clients based on a priority indicator. Thus, by respecting the respective priorities of these second clients, the impact of routing the second client's data on the remaining bandwidth for routing data to other second clients is limited and controlled. According to one embodiment of the invention, the point-to-multipoint connection connects the second port of the optical line termination device to a plurality of point-to-multipoint optical network units to route data from the plurality of second customers, the routing of data from the plurality of second customers other than the customer being independent of the routing selector connected to the customer. According to this mode, the second OLT port can be solely dedicated to protecting a plurality of point-to-point connections to the plurality of second customers or can be used to serve a residential market with residential customers while having at least one point-to-multipoint optical network unit dedicated to backing up at least one point-to-point connectivity. According to one embodiment, an optical line termination device according to the invention further comprises a data routing selector and a microprocessor to command the routing selector to switch the data routing of the first customer according to point-to-point connectivity to routing according to point-to-multipoint connectivity based on the first operating indicator. List of figures Other features and advantages of the invention will become clearer upon reading the following description of embodiments, given by way of simple illustrative and non-limiting examples, and the accompanying drawings, among which: [Fig.1] The [Fig.1] already described in relation to prior art, is a diagram of an optical access network, [Fig.2] The [Fig.2] already described in relation to prior art, is a 2nd diagram of an optical access network, [Fig.3] [Fig.3] is a flowchart of one embodiment of a conveying method according to the invention, [Fig.4] [Fig.4] is a diagram of a first embodiment of the invention, [Fig. 5] [Fig. 5] is a diagram of a second embodiment of the invention, [Fig. 6] [Fig. 6] is a diagram of an OLT optical termination equipment according to the invention, [Fig. 7] [Fig. 7] is a diagram of UN equipment according to the invention. Description of particular embodiments A flowchart of an embodiment of a conveying process according to the invention is illustrated by [Fig.3]. An implementation of the invention requires distinguishing a first customer that can be connected, as well as a plurality of potential second customers that can be connected. Among this plurality, at least one second customer is identified. The data routing method 10 according to the invention is intended to be implemented by a multi-port OLT optical termination device or by a ONU device comprising a PON ONU unit and a PtP ONU unit of an optical access network. This optical access network comprises at least the OLT optical line termination device, a point-to-point connection, and a point-to-multipoint connection. The point-to-point connection is established between a first port of the optical line termination device (OLT) and a point-to-point optical network unit (PtP ONU). This connection enables point-to-point connectivity for the first customer. The point-to-multipoint connection is established between a second OLT port and at least one point-to-multipoint optical network unit (PON). This connection enables point-to-multipoint connectivity for multiple second clients. An optical network unit ONU PON or ONU PtP designates a "customer" equipment, i.e., installed at the customer's premises or very close to that customer's premises. Routing process 10 includes: the routing of 11 data intended for the first customer according to the point-to-point connectivity, the routing of 12 data points intended for the second client according to the multipoint connectivity. The quality of the point-to-point connection is monitored by tracking a primary operational indicator, IndicPtP. This primary IndicPtP indicator can be associated with the physical layer or another layer. The link to the physical layer can be direct and related to the optical transceiver. For example, the indicator can reflect the optical power of the received data, RSSI (Received Signal Strength Indication), either by the OLT or by a ONU and possibly reported back to the OLT. This primary IndicPtP indicator can be a performance indicator. The operating indicator IndicPtP is retrieved, for example, by a control device. This control device compares the indicator to a threshold. As long as the threshold S is not crossed (output branch N of test 13), there is no switchover and Routing 11 continues with the primary point-to-point link. When the threshold S is crossed, the test's output branch Ÿ, the routing switches. Thus, routing 11 of the data destined for the first customer via the primary point-to-point connectivity switches to routing 12 via the secondary point-to-multipoint connectivity when this first customer, then identified as a second customer, is also served via a point-to-multipoint connection. According to the implementation of the invention, the first customer and the second customer form only one customer, i.e. the first customer benefits from a double supply thanks to a point-to-multipoint connection which ensures a very strong improvement in the reliability of its connectivity via the optical access network. In the case of a performance indicator, it may relate to an Ethernet-type data routing protocol. This indicator may be based on Ethernet-level OAM (Operations, Administration, and Management) data. Thus, such an indicator can detect a loss of link continuity (LOC), a loss of signal (LOS), or a loss of received frames (LOF). Test 13 may, in these cases, consist of monitoring a change in the performance indicator's state or comparing a counter of observed losses over a given time period to a threshold. When the state change occurs or when the threshold S is crossed (exit branch Y of the test), the failover takes place. The threshold value is part of the configuration of the PtP link to be rescued. In one embodiment, the routing switchover follows or coincides with the triggering of a test-related alarm. The alarm can be used to cause the OLT to wake up the ONU PON unit if it is in a standby state. In one embodiment, the OLT activates the bidirectional OLT-ONU PON link, which constitutes the secondary point-to-multipoint link, using network parameters (addressing, quality of service, etc.) related to the configuration of the primary point-to-point (PtP) link. These parameters must also take into account the other clients (multiple secondary clients) of this point-to-multipoint link. These parameters are dependent on the configuration of each multipoint link within this point-to-multipoint link. Thus, based on the respective parameters of the multipoint links within this point-to-multipoint link, a prioritization is defined between the different flows of the different secondary clients to route the traffic between the OLT and the ONU PON. For example, the prioritization between flows takes into account the priorities of the destination IP or MAC addresses (of the multiple secondary clients) as well as a tag on the flows that reflects a QoS level assigned to them. After the switchover, the process 10 includes monitoring 14 of a second An indicator of the primary point-to-point link's operation is used to detect the restoration of its proper functioning. In one embodiment, this second indicator is identical to the first operating indicator, IndicPtP. Thus, the switching criteria from the primary link to the secondary link and from the secondary link to the primary link are identical, simplifying the implementation of the invention. When the threshold S is crossed (output branch N of test 14), there is a new switching of the routing. Thus, the routing 12 of data destined for the first client, using the secondary point-to-multipoint connectivity in a backup mode, is switched to a routing 11 using the primary point-to-point connectivity. As long as the threshold S is not crossed (output branch Y of test 14), there is no further switching, and the routing 12 continues with the secondary point-to-multipoint link. After the next failover, that is, when the primary link's operation again meets the criterion (threshold), the client's traffic is once again routed through the point-to-point link. The PON ONU can then release the resources monopolized for the activation of the secondary link. More specifically, the bidirectional OLT-PON ONU providing the secondary link can be released, and this PON ONU can be put into standby mode if it is not serving any clients other than the first client. A first implementation mode of the invention is illustrated by [Fig.4]. According to this mode, the optical access network 20 comprises at least one optical line termination device (OLT), a point-to-point connection and a point-to-multipoint connection. The point-to-point connection is made between a first port of the OLT and a point-to-point optical network unit (PtP ONU) to route data destined for a first customer via point-to-point connectivity. The point-to-multipoint connection is established between a second OLT port and a plurality of ONU PON optical point-to-multipoint network units to carry data destined for a plurality of second customers via point-to-multipoint connectivity. This plurality of ONU PON optical point-to-multipoint network units includes at least one ONU PON optical point-to-multipoint network unit destined for a second customer, the at least second customer of the plurality of second customers. The invention takes place in the context where the first customer and the second customer form only one customer. The access network is unique in that it also includes a routing selector that can be embedded in a cell site gateway / switch (SW). The routing selector is connected to the customer, the point-to-point optical network unit (PtP ONU), and the point-to-multipoint optical network unit (ONU). PON. This selector allows switching the routing of data destined for the customer from primary point-to-point connectivity to secondary point-to-multipoint connectivity, thus providing dual customer access. This switchover is performed according to the previously described procedure. In one embodiment, the access network includes a second routing selector embedded in the OLT. This second selector allows switching, at the OLT level, between primary point-to-point connectivity and secondary point-to-multipoint connectivity, thus providing dual customer access. This switchover is performed according to the previously described procedure. Depending on the specific deployment, the client may be a site hosting a base station. Such a base station requires very high connectivity reliability. Protecting the point-to-point link with a multipoint link allows for a satisfactory level of reliability at significantly lower costs than protection achieved via a second point-to-point link. According to the mode illustrated in [Fig. 4], the point-to-multipoint link is dedicated solely to backup point-to-point links. This mode provides a single backup solution for multiple point-to-point links and reduces the need for ports in active equipment such as OLTs and ONU PON units. This mode is particularly well-suited for business customers with very high connectivity requirements. A second implementation of the invention is illustrated in [Fig. 5]. Unlike the implementation illustrated in [Fig. 4], the point-to-multipoint link is not solely dedicated to providing backup for point-to-point links. In this second implementation, the point-to-multipoint link is also used as the primary link for a plurality of secondary customers who are not served by a point-to-point link but only by this point-to-multipoint link. These secondary customers typically belong to the residential market, which is less demanding in terms of reliability than the business market. According to this implementation, one or more PON ONU units can be dedicated to protecting point-to-point links. Thus, the point-to-multipoint link can simultaneously provide connectivity for residential customers and backup connectivity for customers who are generally business customers, since they also benefit from a point-to-point link. Figure 6 is a diagram of an OLT device according to the invention. The OLT equipment comprises one or more PON Cards or PtP Cards, each with one or more optical ports and an SEL_OLT selector for data destined for or originating from a client. For a given optical port on a card, that card includes at least one multiplexer-demultiplexer. Mux / Demux of upstream and downstream flows, a receiver Rx of upstream data from a client and a transmitter Tx of downstream data to be transmitted to a client. The OLT is designed to be connected to a point-to-point optical network unit (ONU PtP) via a first port and a first optical fiber to carry data destined for or originating from a first customer using a point-to-point (c_PtP) connection. The OLT is also designed to be connected to multiple point-to-multipoint optical network units (ONU PON) via a second port to transmit data destined for or originating from multiple secondary customers, including the first customer, using a point-to-multipoint (c_PtMP) connection. The OLT equipment further comprises a microprocessor uP or equivalent, such as a microprogrammed electronic component, the operation of which is controlled by the execution of a program Pg whose instructions enable the implementation of a routing method according to the invention. The program Pg is, for example, stored in a MEM memory. The microprocessor uP controls the SEL_OLT routing selector and at least the various components associated with a given optical port via control signals: the receiver Rx, the transmitter Tx, and the multiplexer / demultiplexer Mux / Demux. The microprocessor uP remotely controls the ONUs via an exchange protocol that is generally transmitted within the frames (known as the In-band protocol). The microprocessor uP receives a local IndicPtP indicator of the point-to-point connectivity c_PtP from the receiver Rx or transmitter Tx. This indicator is, in one embodiment, an indicator of the optical power RSSI received at the OLT. In another embodiment, a remote PtP link indicator is transmitted from the PtP ONU. By executing instructions from the Pg program, the microprocessor uP toggles the SEL_OLT routing selector based on the value of the local and / or remote IndicPtP status indicator. Thus, when this indicator changes state or crosses a threshold, the downstream data destined for the client and routed via the primary point-to-point connectivity is routed after switching to the secondary point-to-multipoint connectivity. The upstream data from the client is routed using the same connectivity as the downstream data. When the status indicator of the backup point-to-point link shows that this link has returned to acceptable operation, data is once again routed via this link. According to one embodiment of OLT, the SEL_OLT selector is essentially implemented functionally by exploiting the destination address or of data provenance i.e. if this address corresponds to that of the client whose point-to-point link needs to be rescued, this data is routed via the multipoint link. Figure 7 is a diagram of an embodiment of a ONU according to the invention. Each PtP ONU, or PON ONU, can be implemented as an interface between a home or business gateway and the optical fiber used for point-to-point or point-to-multipoint connectivity. Each interface can be part of this gateway or incorporated into a separate enclosure. In one embodiment, the ONU equipment combines the two PtP and PON ONU units. Such a combination can be advantageous for reducing the cost and energy consumption of the backup solution according to the invention. The functional blocks of this ONU equipment, which operate for both the point-to-point (PtP) and point-to-multipoint (PtMP) links, are shown in [Fig. 7]. Among these blocks, the PMD PtP and PMD PtMP PON blocks include the optoelectronic components, including the optical transmitters and receivers for interconnection with each of the two optical fibers. The ONU equipment also includes a storage space or MEM memory and a SEL_CLI routing selector. The ONU equipment further comprises a computing unit such as an HP microprocessor or equivalent microprogrammed electronic component whose operation is controlled by the execution of a program Pg whose instructions enable the implementation of a routing method according to the invention. The program Pg is, for example, stored in MEM memory. The first optical fiber of the point-to-point (PtP) link connects the ONU equipment to a PtP port on the OLT. The second optical fiber of the point-to-multipoint (PtMP) link connects the ONU equipment to a PtMP port on the OLT via a splitter / combiner (S / C). Each implemented interface corresponding to one of the ONU PtP and ONU PON units must include several protocol layers: a physical layer (PHY layer) with, for a point-to-point PtP link or for a point-to-multipoint link conforming to an IEEE standard, the three sub- diapers: PMD Physical Medium Dependent PMA Physical Medium Attachment PCS Physical Coding Sublayer and with, for a point-to-multipoint link conforming to an ITU standard, the two sublayers: PMD Physical Medium Dependent TC Transmission Convergence a data link layer for physical addressing with the sub- MAC (Medium Access Control) and LLC (Logical Link Control) layers a network layer that determines routing and logical addressing. The functions corresponding to these protocol layers can be stored in MEM memory as specific program instructions and data and / or parameters. Thus, the execution of these specific instructions by the microprocessor uP activates the protocol layers necessary for implementing the point-to-point (PtP) and / or point-to-multipoint (PtMP) links. By executing specific instructions in the Pg program, the microprocessor uP toggles the SEL_CLI routing selector based on the value of the local or remote IndicPtP functionality indicator transmitted by the OLT. Thus, when this indicator, depending on its nature, changes state or crosses a threshold, the downlink data destined for the client and routed via the primary point-to-point connectivity is routed after switching to the secondary point-to-multipoint connectivity. The uplink data from the client is routed using the same connectivity as the downlink data. When the functionality indicator of the failed point-to-point link shows that this link has returned to acceptable operation, data is once again routed via this link. In one embodiment, the microprocessor uP further considers an operating indicator IndicPtMP of the point-to-multipoint link to decide when to switch over the routing. According to this embodiment, the switchover cannot occur until the operating indicator IndicPtMP shows satisfactory operation of the point-to-multipoint link. The switchover is accompanied by the activation of the protocol layers necessary for the selected routing link. According to one embodiment of the UN equipment, the SEL_CLI selector is essentially implemented functionally, by exploiting the destination or origin address of the data, i.e. if this address corresponds to that of the client whose point-to-point link must be rescued, this data is routed via the point-to-multipoint link. According to one embodiment, the implementation process on the UN equipment side is as follows. Initially, the ONU is connected to the OLT via both fibers, only the primary point-to-point link is active for traffic flow, and the ONU is configured with the associated protocol layers. The PMD PtP and PMD PtMP PON blocks are powered even though data is only flown over the link. Point-to-point. This allows the ONU's microprocessor (uP) to retrieve information not only about the status of the point-to-point link but also about the status of the point-to-multipoint (PtMP) link by receiving the downlink optical signal, even if it does not carry data. Indeed, when the operating indicator (IndicPtP, or IndicP(MP)) corresponds to the RSSI, its value indicates whether the physical PtP or PtMP link is properly connected to the corresponding port on the OLT. When the state of the PtP link degrades and the IndicPtP operating indicator crosses a threshold or changes state, then the microprocessor uP commands the switching of the routing selector SEL_CLI to rescue the PtP link with the PtMP link and executes the specific instructions associated with the functions corresponding to the protocol layers of this PtMP rescue link. According to one embodiment, a control exchange occurs with the OLT for the registration of the client in association with the backup link before the data flow intended for the client is actually routed via the backup link. When the state of the PtP link improves and the IndicPtP operating indicator crosses the threshold or changes state, then the microprocessor uP commands the switching of the routing selector SEL_CLI to resume routing the data stream via the PtP link and executes the specific instructions associated with the functions corresponding to the protocol layers of this PtP link. Thus, the invention further relates to a computer program on an information medium, this program comprising program instructions adapted to the implementation of a method according to the invention when said program is loaded and executed in an optical line termination (OLT) device. And, the invention further relates to an information carrier comprising program instructions adapted to the implementation of a method according to the invention, when this program is loaded and executed in an optical line termination device OLT.

Claims

Demands

1. Method (10) of data routing (Data) intended to be put into operated by an optical access network comprising at least one device multi-port optical line termination (OLT) network, a rac- point-to-point rope between a first port of the ter- device Optical line termination (OLT) and a point-to-point optical network unit point (ONU PtP) enabling point-to-point connectivity of a first client and a point-to-multipoint connection between a second port of the optical line termination (OLT) device and at least one unit of point-to-multipoint optical network (ONU PON) enabling a multipoint connectivity of a plurality of secondary clients including at least one second customer, including: routing (11) of data from the first customer according to the point-to-point connectivity, routing (12) of data from the second client according to the multipoint connectivity and characterized in that it further includes the first client and the second client constituting only one client: a first switchover (13, Y) of the routing of customer data according to the so-called point-to-point connectivity primary to a routing according to multipoint connectivity secondary tipoints, based (13) on at least one first in- operating indicator (indicPtP) of the point-to-point connection point to obtain a double customer connection.

2. A method (10) according to claim 1, wherein the at least first indicator (IndicPtP, LOC, LOS, LOF) of operation is an in- performance indicator for an Ethernet-type protocol data routing.

3. A method (10) according to claim 1, wherein the at least first The functionality indicator (IndicPtP, RSSI) is relative to a layer physical protocol for data transmission.

4. A method (10) according to any one of claims 1 to 3, further comprising: a second switchover (14, N) of the routing of customer data according to point-to-multipoint connectivity subordinate to routing based on point-to-point connectivity primary point, based (14) on at least a second indicator operating (IndicPtP) of the point-to-point connection.

5. A method (10) according to claim 4, wherein the same indicator the operating principle is used for the initial switching and the second switchover.

6. A method (10) according to any one of claims 1 to 5, further comprising: routing of data from the plurality of seconds clients based on a data classification, a pa- mapping of the point-to-point connection and its parameters of point-to-multipoint connection.

7. Optical access network (20) comprising at least one ter- device Optical line (OLT) mining, a point-to-point connection between a first port of the optical line termination (OLT) device and a point-to-point optical network unit (PtP ONU) to carry data from a first customer via point-to-point connectivity, and a multipoint connection between a second port of the device optical line termination (OLT) and at least one network unit Optical point-multipoint (ONU PON) for data transmission of a plurality of second customers including at least one second client according to a point-to-multipoint connectivity, the access network being characterized in that it also includes the first customer and at least second customer forming only one customer: a routing selector (SEL_CLI) connected to the customer, at the point-to-point optical network unit (PtP ONU) and the unit of point-to-multipoint optical network (ONU PON) for switching the routing of customer data according to connectivity primary point-to-point routing, known as primary routing, follows the secondary multipoint connectivity, based on minus a first operating indicator (IndicPtP) of the point-to-point connection to obtain a double water supply of the client.

8. Optical access network (20) according to claim 7, wherein the The multipoint connection connects the second port of the device. Optical line termination (OLT) to a plurality of network units optical point-multipoint (ONU PON) for transmitting data from the plurality of second clients, the routing of data from the plurality of secondary clients other than the client being independent of the routing selector connected to the customer.

9. Routing selector (SEL_CLI) intended to be connected to a customer, intended to be connected to a point-to-point optical network unit (ONU PtP) for a point-to-point connection between a first port of an optical line termination (OLT) device of a network optical access and the client to route client data according to point-to-point connectivity and intended to be connected to a unit of point-to-multipoint optical network (ONU PON) for a connection multipoint connection between a second port of the termination device Optical Line Terminal (OLT) and at least the customer to route the data from the client using point-to-multipoint connectivity, capable of switching an ache- mining of customer data according to so-called point-to-point connectivity primary to a routing according to point-to-multipoint connectivity secondary based on at least one operating indicator (IndicPtP) of the point-to-point connection to obtain a double customer supply.

10. Multi-port Optical Line Termination (OLT) Device intended for an optical access network, intended to be connected to a unit point-to-point optical network (PtP ONU) via a first port for route data from a first customer via point-to-point connectivity at a point, intended to be connected to a plurality of optical network units multipoint (ONU PON) via a second port to transmit data from a plurality of second customers including the first client using point-to-multipoint connectivity, suitable for switching the routing of data from the first customer according to connectivity Point-to-point to routing based on point-to-multipoint connectivity based on at least one initial operating indicator (indicPtP) of point-to-point connectivity.

11. | Optical line termination (OLT) device according to claim previous including a routing selector (SEL_OLT) of data and a microprocessor (uP) to control the selector routing (SEL_OLT) to switch data routing from the first customer according to point-to-point connectivity to a routing depending on point-to-multipoint connectivity based on the first indicator operating (indicPtP).

12. Computer program on an information carrier, said program including program instructions adapted for implementation of a method according to any one of claims 1 to 6 when said program is loaded and executed in a termination device optical line technology (OLT).

13. Information carrier containing program instructions adapted to the implementation of a process according to any of the re- demands | to 6, when said program is loaded and executed in an optical line termination (OLT) device.