CN110809203B

CN110809203B - System and method for expanding FTTH network by master-slave ONT

Info

Publication number: CN110809203B
Application number: CN201910977408.7A
Authority: CN
Inventors: 王斯星; 刘财根
Original assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Current assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2022-03-11
Anticipated expiration: 2039-10-15
Also published as: CN110809203A

Abstract

The invention discloses a system and a method for expanding an FTTH network by a master-slave ONT (optical line terminal), which comprises an OLT (optical line terminal), a master ONT (optical network terminal), a plurality of slave ONTs (optical network terminals), and a PON (passive optical network) system of a plurality of virtual slave ONTs from the master ONT, wherein the PON system replaces the slave ONTs to realize interaction with the OLT and data service forwarding of the OLT, and the OLT realizes the expansion of network distance through the PON system corresponding to the slave ONTs virtually formed by the master ONTs and the master ONTs.

Description

System and method for expanding FTTH network by master-slave ONT

Technical Field

The present invention relates to the field of ONTs, and in particular, to a system and method for extending an FTTH network by a master-slave ONT.

Background

The existing optical access network FTTX in China is mainly used for urban districts, small towns and places with concentrated population and dense users; but the method is not popularized in vast rural areas, and with the emphasis of governments on rural construction, the construction of three information farmers is increased, and a high-speed information network is required to cover most farmers;

because rural areas are wide and rare, the spaced line distance is long, and user points are scattered, even if FTTH optical fibers are accessed, due to the limitation of limited optical path loss budget (rural users are not concentrated and scattered, only multi-beam splitting cascade connection can be adopted, the cascade connection type is serious, ODN loss is large, optical path loss is also large, the optical power is insufficient, FTTH cannot be deployed), and many remote users cannot always cover the FTTH optical fibers;

in order to cover this part of users, the mainstream feasible solution is: purchasing a compact OLT, and moving down or sinking the OLT to a user side; the bottleneck brought by the loss of the middle light path is reduced, so that the effect can be achieved; however, in remote places, the installation condition is very poor, a centralized machine room is not available, the machine room is not standard, the power supply is troublesome, the remote maintenance is inconvenient, the engineering and operation and maintenance costs are high, resources are wasted, the investment income is too small (the compact OLT can support hundreds of users at minimum, and investments of hundreds of users for several users), and operators are often unwilling to adopt the method.

Disclosure of Invention

The invention aims to provide a system and a method for expanding an FTTH (fiber to the home) network by a master-slave ONT (optical network terminal), which adopt an expansion scheme of a terminal network, break the limitation bottleneck brought by optical loss at an edge network with lower cost and insufficient optical power by a technology and expand the access range of the edge network; the remote user can access the high-speed information network.

A system for expanding FTTH network by master-slave ONTs comprises an OLT, a master ONT, a plurality of slave ONTs and a PON system of a plurality of slave ONTs virtually formed by the master ONT, wherein the PON system replaces the slave ONTs to realize interaction with the OLT and data service forwarding of the OLT, and the OLT realizes expansion of network distance through the PON system corresponding to the slave ONTs virtually formed by the master ONT and the master ONT.

Further, the primary ONT further includes a secondary optical port, a PON chip, and a primary PON optical module, where the PON chip is connected to the secondary optical port and is used to control the primary PON optical module to transmit data to the secondary PON optical module.

Further, the transmitting parameters of the slave PON optical module are set to 1490 optical waves, and the receiving parameters are set to 1310 optical waves.

Furthermore, the primary ONT virtualizes a plurality of virtual secondary PON optical modules on one primary PON optical module, and is used for information interaction between the primary ONT and the secondary ONTs.

A method for a master-slave ONT to extend an FTTH network, comprising:

s1: the master ONT and the slave ONT establish a master-slave relationship, and the PON system corresponding to the slave ONT is virtually established on the software of the master ONT;

s2: the PON system virtualized by the main ONT replaces the slave ONT to interactively register with the OLT;

s3: the virtual PON system on the master ONT forwards data normally for the slave ONT.

Further, the step S1 includes:

connecting an optical fiber, and actively reporting PON information of the optical fiber from the ONT;

the master ONT replies the determination information, and the slave ONT replies the readiness and establishes the master-slave relationship;

and a plurality of virtual slave ONTs are established on the main ONT, and meanwhile, the PON system corresponding to the virtual slave ONTs is established on the main ONT software.

Further, the step S2 includes:

the virtual slave ONT initiates a registration process to the OLT through the PON system;

distributing ONID, measuring distance and distributing time slot, and reporting SN from ONT through PON system;

and finally, the interaction and the registration are successful.

Further, the step S2 further includes:

the main ONT replies the information acquired by the PON system to the slave ONT;

the master ONT sends a synchronization state and a heartbeat message to the slave ONT;

the slave ONTs synchronize virtual slave ONT status information.

Further, the step S3 includes:

when the PON system transmits a message using uplink time division multiplexing,

the slave ONT sends the uplink message to the master ONT on the corresponding time slot;

the main ONT transfers the received message to a virtual ONT;

the virtual ONT drives the main light module of the main ONT, which sends the data to the user terminal.

When the PON system transmits a message using downlink wavelength division multiplexing,

the primary ONT judges the received ONTID;

if the ONTID is judged to be the ONTID of the main ONT, the ONTID is forwarded to the main ONT, and the main ONT sends data to the user terminal;

if the ONTID is judged to be the ONTID of the virtual ONT, the corresponding virtual ONT is switched through the circuit, and the virtual ONT sends data to the slave ONT and then sends the data to the user application terminal from the slave ONT.

The invention has the beneficial effects that: the method adopts an expansion scheme of a terminal network, breaks the limitation bottleneck brought by light loss through a technology in an edge network with low cost and insufficient optical power, and expands the access range of the edge network; the remote user can access the high-speed information network.

Drawings

FIG. 1 is a system diagram of a master-slave ONT to extend an FTTH network;

FIG. 2 is a schematic diagram of a primary ONT configuration;

FIG. 3 is a schematic diagram of a connection configuration of a master ONT and a slave ONT;

fig. 4 is a schematic diagram of a method for extending the FTTH network from a legacy ONT.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the invention, specific embodiments thereof will now be described with reference to the accompanying drawings.

For example, as shown in fig. 1, a main ONT virtualizes a PON system with multiple slave ONTs on a set of PON hardware through a software virtualization technology, and on the main ONT, the virtualized PON system may replace the slave ONTs to implement interaction with an OLT and forwarding of data traffic of the slave ONTs; therefore, the access of the ONT beyond the optical range of the OLT is expanded within the limited optical budget range; and the coverage of the out-of-range remote users is realized.

As shown in fig. 2 and fig. 3, the master ONT is provided with a plurality of slave PON optical modules corresponding to the slave ONTs, and is used for information interaction between the master ONT and the slave ONTs; the tx parameter of the slave PON optical module is set to be 1490 light waves, and the rx parameter is set to be 1310 light waves; the main ONT further comprises a slave optical port, a PON chip and a main PON optical module, wherein the PON chip is connected with the slave optical port and used for controlling the main PON optical module to transmit data to the slave PON optical module.

As shown in fig. 4, a method for a master-slave ONT to extend an FTTH network includes:

The step S1 includes: connecting a master optical fiber and a slave optical fiber, locking the master-slave relationship, collecting slave information by the slave ONT after the optical fibers are connected, sending a certain locking interaction information to the slave ONT by the master ONT from a PON port, reporting important parameters of the PON to the master ONT after the slave ONT receives the locking information, creating a virtual ONT corresponding to the virtual ONT by the master ONT, sending a regular heartbeat message by utilizing idle and the slave ONT, and synchronizing the PON information by the slave ONT after the master ONT replaces the slave ONT to register on the OLT successfully; subsequently, synchronous operation can be started according to whether the synchronous field of the heartbeat message band exists or not; therefore, the states and information of the master ONT and the slave ONT can be consistent.

Virtualizing a plurality of non-interfering people PON systems on the software of the main ONT according to the virtual machine principle; each virtual PON system corresponds to a real slave ONT and replaces the real slave ONT; the performance requirement of the main ONT is a little higher, and one ONT suggests 2 virtual PON systems at most according to the performance of the optical modem; namely, one master ONT belt 2 left and right slave ONTs;

the step S2 includes: after the master-slave relationship is bound, the primary ONT is a virtual ONT, the primary ONT needs to exist as an independent virtual ONT on software, and the interaction between the primary ONT and the OLT is sent out by the virtual ONT and completed by the real hardware of the primary ONT; the interaction of the virtual ONT and the OLT is the same as that of the real ONT, the OLT windows, the virtual ONT reports SN, the ranging is completed independently, and the distributed ONTID independently exists in the virtual ONT software; in this way, the OLT can make the slave ONTs unaware of the existence of the slave ONTs, and the OLT assumes that the virtual ONT is also a real ONT within its optical range and can perform normal interaction processing; after the interaction between the virtual ONT and the OLT is completed, a synchronization state and a heartbeat message are sent to the slave ONT, and after the slave ONT receives the information, the state of the virtual ONT is synchronized.

The step S3 includes: as known in the PON system, uplink is time division multiplexing, downlink is wavelength division, uplink is time division slot for transmitting messages, and downlink is broadcast.

The upstream feasible principle is as follows: on the same optical module, because data is sent in time slices, when no time slot exists, the TX of the optical module is idle, if the time slices of a plurality of ONTs are all put on one optical module for use, the conflict is avoided, namely, the data sending of a plurality of virtual ONT systems can be realized on a main ONT, and the uplink is feasible;

and uplink implementation: the time of the master and slave ONTs must be synchronized very consistently, the time slots obtained from the OLT by the slave ONTs (i.e., the time slots obtained by their corresponding virtual ONTs); the slave ONT sends an uplink message to the master ONT in the corresponding time slot, the master ONT directly transfers to the corresponding virtual ONT after receiving the message from the PON port, the virtual ONT drives a master optical module of the master ONT, and data are sent to the OLT from the master optical module.

The downlink feasible principle is as follows: because the OLT is the data sent in a broadcast mode, the data all have ONTIDs, each ONT below identifies whether the data is the data of the ONT according to whether the data is the data of the ONT, if a plurality of slave ONTs are virtually simulated on the main ONT through a virtual technology, the slave ONTs can interact with the OLT to obtain different ONTIDs, and if the data of the plurality of ONTs can be identified on a receiving module of the main ONT, the data can be received by the plurality of slave ONTs at the same time, so that the downlink is also feasible.

And downlink realization: when the main ONT receives the data of the ONTID of the main ONT or the virtual ONT, if the data is the ONTID of the main ONT, the data is forwarded to the LSW switching chip or the voice or wifi chip of the main ONT, and if the data is the ONTID of the virtual ONT, the data is switched to the slave PON outlet of the corresponding virtual ONT in time through a circuit and is sent to the slave ONT from the slave PON outlet, so that the downlink data forwarding is realized.

The foregoing shows and describes the general principles and features of the invention, together with the advantages thereof. It will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A master-slave ONT expands the system of FTTH network, including OLT, main ONT and multiple slave ONTs, characterized by that, also include the PON system of multiple slave ONTs virtualized from main ONT, said PON system replaces the slave ONT to realize the interaction with OLT and data service forwarding of OLT, OLT realizes the expansion of the network distance through the PON system corresponding to slave ONT virtualized from main ONT and main ONT; the main ONT further comprises a slave optical port, a PON chip and a main PON optical module, wherein the PON chip is connected with the slave optical port and used for controlling the main PON optical module to transmit data to the slave PON optical module; the main ONT is arranged on one main PON optical module, virtualizes a plurality of virtual auxiliary PON optical modules and is used for information interaction between the main ONT and the auxiliary ONTs.

2. The system of claim 1, wherein the transmitting parameters of the slave PON optical module are set to 1490 optical waves and the receiving parameters are set to 1310 optical waves.

3. A method for a master-slave ONT to extend an FTTH network, comprising:

the step S1 includes:

a plurality of virtual slave ONTs are established on the main ONT, and meanwhile, a PON system corresponding to the virtual slave ONTs is established on the main ONT software;

the step S2 further includes:

synchronizing the virtual slave ONT state information from the slave ONT;

4. The method for extending an FTTH network by a master-slave ONT according to claim 3, wherein the step S2 comprises:

and finally, the interaction and the registration are successful.

5. The method for extending an FTTH network by a master-slave ONT according to claim 3, wherein the step S3 comprises:

the main ONT transfers the received message to a virtual ONT;

the virtual ONT drives a main light module of the main ONT, and the main light module sends data to the user terminal;

the primary ONT judges the received ONTID;

if the ONTID is judged to be the ONTID of the virtual ONT, the corresponding virtual ONT is switched to through the circuit, and the virtual ONT sends data to the slave ONT and then sends the data to the user application terminal from the slave ONT.