CN1750495A - Optical fiber access net and its communication protecting method - Google Patents

Abstract

The invention relates to an optical fiber access network and a communication protection method thereof. The optical fiber access network includes an optical fiber communication system, a wireless communication system and a communication service switching device. When the optical fiber between the optical line terminal and the optical network unit in the optical fiber communication system When a fault occurs, the communication service switching device switches the communication service from the optical fiber communication system to the wireless communication system; after the failure of the optical fiber is removed, the communication service switching device switches the communication service from the wireless communication system back to the optical fiber communication system. The structure of the protection system of the invention is simple, and the invention can break through the limitation of resources such as pipelines and optical cables, facilitate the utilization of communication equipment, and effectively guarantee the communication services of the optical fiber communication system.

Description

Optical Fiber Access Network and Its Communication Protection Method

technical field

The present invention relates to an optical fiber access network and a communication protection method thereof, in particular to an optical fiber access network with a communication protection function capable of providing wireless communication protection when an optical fiber is disconnected and faulty, and when an optical fiber is disconnected and faulty, A communication protection method to ensure that communication services are not affected.

Background technique

The use of optical fiber access network is an inevitable trend in the development of optical fiber communication. There are usually five topological structures of optical fiber access network: single star, multi-star, tree, bus and ring. For the first four, they can be collectively referred to as star structure. Compared with the ring network and point-to-point system, the star network can save a lot of optical fibers and optical transceiver modules, and its branch structure is easier to cover, so for the optical fiber access network, the star structure is generally adopted.

In the optical fiber access network, in order to ensure the normal operation of communication services, it is usually necessary to protect the optical lines. The protection methods mainly include the following:

1. Use the same cable splitting method for protection, that is, there are main and backup fibers in the same cable. When the main fiber is cut off, the backup fiber can be used. However, when the entire cable is cut off, this method cannot Ensure the normal progress of communication services.

2. Use the same route splitting method for protection, that is, on the same pipeline or route, the main and backup optical fibers are in different optical cables, so that when the optical cable where the main optical fiber is located fails, the backup optical fiber can be activated. However, this method It can only protect general optical cable cutting failures, but cannot prevent large-scale failures, such as the accident of cutting optical cable ducts in a large area due to the construction of large machinery.

3. The protection is carried out in the way of cable splitting, that is, the main and backup optical fibers are not only different cables, but also different pipelines or routes. This approach provides maximum protection for fiber optic lines, but at a high economic cost.

However, in the existing actual protection applications, due to the limitation of pipelines, optical fiber resources and construction costs, only the above-mentioned protection methods are used to protect the optical fiber lines between the optical line terminal and the optical splitter, and the star type is rarely used. The optical fiber line between the optical splitter and the optical network unit in the network access network is protected. Once the optical fiber is broken, the network communication will be invalid.

Many tariff-sensitive users and users who need real-time network information exchange do not have strict QOS requirements for the network and can tolerate network performance degradation in a short period of time, such as network speed drops, but they cannot tolerate long-term network degradation. interruption. Therefore, it is a necessary guarantee for the smooth communication of the user network to adopt an appropriate and effective way to protect the optical fiber access network.

Contents of the invention

The main purpose of the present invention is to provide a kind of optical fiber access network and its communication for the defects of the protection mode of the above-mentioned optical fiber access network and the reason and current situation of insufficient protection of the optical fiber line of the star optical fiber access network in actual use. The protection method, the optical fiber access network and the method combine the wireless communication system and the optical fiber communication system, so that the communication services of the optical fiber communication system are effectively guaranteed.

In order to achieve the above object, the present invention provides an optical fiber access network, including an optical fiber communication system at least composed of an optical line terminal, an optical distribution network, an optical network unit, and an integrated access device at a user end, and also includes a wireless base station, the The communication connection between the wireless base station and the optical line terminal; the wireless communication connection between the wireless base station and the wireless user end equipment; the wireless user end equipment and the optical network unit are respectively connected to the communication service switching device for switching the communication line connected, the wireless client equipment is also communicatively connected to the optical network unit, and the communication service switching device is connected to the integrated access device at the user end; the optical network unit is provided with a detection module for detecting signals and A control module for sending a switching control signal to the communication service switching device. Wherein, the detection module may be connected with the control module, and the communication service switching device may be placed inside the optical network unit, that is, integrated with the optical network unit.

The optical fiber access network can protect the communication service between the optical line terminal and the optical network unit in the optical fiber communication system. Usually, the communication service is carried out in the optical fiber communication system. When the optical fiber communication system is working, the detection module detects the amplitude, power and/or energy of the signal transmitted in the optical fiber communication system. When the amplitude, power and/or energy of the signal are lower than When the threshold value is set in advance, it is considered that the optical fiber between the optical line terminal and the optical network unit in the optical fiber communication system is broken, and the communication service switching device switches the communication service in the optical fiber communication system to the wireless communication system. The transmission rate and stability are superior to wireless communication systems. When the detection module detects that the amplitude, power and/or energy of the signal from the optical line terminal is higher than the preset threshold, it is considered that the optical fiber in the optical fiber communication system After the fracture fault is eliminated, the communication service switching device switches the communication service from the wireless communication system back to the optical fiber communication system.

The invention adopts the wireless communication system to protect the optical fiber lines of the star-shaped optical fiber access network, has a simple structure, can detect faults in time and can effectively switch between communication systems, and satisfies the user's demand for network unavailable time, and Compared with the current unprotected or 1+1 wired protection scheme for optical fiber lines in the star-shaped optical fiber access network, it not only breaks through the limitations of pipeline and optical cable resources, greatly reduces investment and operation and maintenance costs, but also can The local area adopts the wireless method to quickly cover the communication area. After the optical cable is laid, the wireless communication system can be used as the protection system of the optical fiber communication system, which is conducive to step-by-step implementation and recycling of old equipment. , especially the unimpeded communication business of group users is very beneficial.

It will be further described below through specific embodiments of the present invention and accompanying drawings.

Description of drawings

Fig. 1 is the system structural diagram of optical fiber access network of the present invention;

FIG. 2 is a schematic flow diagram of switching communication services from an optical fiber communication system to a wireless communication system;

Fig. 3 is a schematic flow chart of restoring communication services from the wireless communication system to the optical fiber communication system.

Detailed ways

The main idea of the present invention is to introduce a wireless communication system to protect the optical fiber line between the optical line terminal and the optical network unit in the star-shaped optical fiber access network. The optical fiber access network with protection includes an optical fiber communication system, a wireless communication system and Communication service switching device. Under normal circumstances, the communication service is carried out in the optical fiber communication system. When the optical fiber between the optical line terminal and the optical network unit in the optical fiber communication system breaks and fails, the communication service switching device switches the communication service in the optical fiber communication system to wireless communication. System; because optical fiber communication is superior to wireless communication in terms of transmission rate and stability, after the fault of the optical fiber in the optical fiber communication system is eliminated, the communication service switching device will switch the communication service from the wireless communication system back to the optical fiber communication system.

Fig. 1 shows the system structure diagram of the optical fiber access network of the present invention, in this optical fiber access network, the optical fiber communication system at least includes optical line terminal 1, optical distribution network 2, optical network unit 3 and user end integrated access equipment. Among them, the optical line terminal 1 has interfaces with the switching network, the data network, the wireless base station 6 and the optical distribution network 2, etc., and is respectively connected to the switch, the router, the wireless base station 6 and the optical distribution network 2, etc., and provides necessary means to Transmission of various communication services; the optical distribution network 2 provides the optical network unit 3 and the optical line terminal 1 with the physical connection of the optical fiber as the transmission medium, and makes the signal transmitted in the optical fiber redistribute the power after coupling in the coupling area; The network unit 3 is provided with an interface connected to the wireless user terminal equipment 7 and an interface of the user terminal integrated access equipment 5, and is connected to the optical distribution network 2 and the communication service switching device 4 for switching communication lines, at least including The detection module 31 for detecting the signal transmitted in the signal optical fiber communication system, the alarm module 32 for generating signal loss alarm information when the detection module 31 fails to detect the signal, and for sending the switching control signal to the communication service switching device 4 A control module 33, a service interface function module 34 for sending and receiving information of the wireless client equipment 7, and a power supply and maintenance management function module 35 for powering the optical network unit 3 and comprehensive service management, wherein the detection module 31 and The alarm module 32 is connected with the power supply and maintenance management module, and can also be connected with the control module 33. Specifically, detection devices such as amplitude, power and/or energy can be used; the alarm module 32 is connected with the service interface function module 34, and the service interface function module 34 Connect with the power supply and maintenance management function module 35 and the communication service switching device 4, and communicate with the wireless client equipment 7, the control module 33 is connected with the service interface function module 34 and the power supply and maintenance management function module 35, and pass and business The interface function module 34 is connected with the communication service switching device 4. Wherein, the detection module 31 can also be integrated with the alarm module 32.

The communication service switching device 4 is used to switch the communication line, that is, to control the connection of the user terminal integrated access device 5 with the optical network unit 3 or the wireless user end device 7, so that the control communication service is performed by the optical fiber communication system or the wireless communication system The switching is controlled by the control module 33 inside the ONU 3 through the service interface function module 34, which can be placed independently of the ONU 3 or placed inside the ONU 3, that is, integrated with the ONU 3. Specifically, the switching device can be an electric switch, an optical switch, a photoelectric switch, a micromechanical switch, or an optical waveguide switch. The network unit 3 is connected, and the user terminal integrated access device 5 is connected with the wireless user terminal device 7 when the optical fiber breaks.

The wireless communication system includes a wireless base station 6 and a wireless user terminal device 7, wherein the wireless base station 6 communicates with the input end of the optical line terminal 1, communicates with the wireless user terminal device 7, and performs wireless transmission and reception and wireless resource management, etc. It can be a point-to-point system or a point-to-multipoint system, such as a WiMax system; the wireless client device 7 is provided with an interface connected to the optical network unit 3 and the user terminal integrated access device 5, and is used to carry out communication lines The switched communication service switching device 4 is connected to communicate with the optical network unit 3 to realize the information sending and receiving between the optical network unit 3 and the information transmission between the wireless base station 6 and the user terminal integrated access device 5 .

When the optical fiber communication system is working, the power meter and/or energy meter detects the power and/or energy of the signal transmitted in the optical fiber communication system. When the power and/or energy of the signal is lower than the preset threshold, it is considered that the optical fiber between the optical line terminal and the optical network unit in the optical fiber communication system is broken, and the communication service switching device switches the communication service from the optical fiber communication system to wireless communication system. Fig. 2 shows that the present invention switches the communication service from the optical fiber communication system to a specific process of the wireless communication system, and performs the following steps:

Step 201. The power meter detects that the power of the signal transmitted in the optical fiber communication system is less than the preset threshold power, and considers that the signal is lost;

Step 202. The power meter sends the signal loss information to the alarm module;

Step 203. The alarm module transmits the signal loss alarm information to the wireless client device;

Step 204. The wireless client equipment sends information requesting bandwidth allocation to the wireless base station;

Step 205. The wireless base station allocates corresponding bandwidth to the wireless client equipment, and sends confirmation information that the bandwidth has been allocated;

Step 206. The wireless client device sends request information for switching the communication service to the wireless communication system to the control module;

Step 207. The control module sends a switching control signal to the optical switch;

Step 208. The electric switch switches the communication line connected to the optical network unit to the wireless client device according to the switching control signal sent by the control module, so that the uplink signal of the communication service is switched to the wireless client device;

Step 209. The wireless client equipment transmits the uplink signal to the wireless base station;

Step 210. The wireless base station sends the downlink signal to the corresponding wireless user end equipment to complete the switching of the communication service line.

Wherein, after the power meter in the optical network unit detects that the power of the signal is less than the set threshold power, the power meter directly sends the signal loss information to the control module, and the control module controls the optical switch to switch the communication service to wireless communication The system proceeds, that is, steps 202-206 can be omitted.

After the fiber break fault between the optical line terminal and the optical network unit in the optical fiber communication system is repaired, since the downlink direction is broadcast mode, the power meter and/or energy meter can detect the power and/or power of the signal transmitted in the optical fiber communication system Or if the energy is higher than the preset threshold power, it is considered that the signal from the optical line terminal is received, and the communication service switching device switches the communication service from the wireless communication system back to the optical fiber communication system. Fig. 3 shows that the present invention switches the communication service back to a specific process of the optical fiber communication system from the wireless communication system, and performs the following steps:

Step 301. The power meter detects that the power of the signal is higher than the preset threshold power, and considers that the signal is received;

Step 302. The power meter sends the information of the received signal to the alarm module;

Step 303. The alarm module sends the signal loss alarm message to the wireless client device;

Step 304. The wireless client device sends bandwidth release request information to the wireless base station;

Step 305. The wireless base station releases the corresponding bandwidth, and sends bandwidth release confirmation information to the wireless client equipment;

Step 306. The wireless client device sends request information for switching the communication service to the optical network unit to the control module;

Step 307. The control module sends a switching control signal to the optical switch;

Step 308. The electric switch switches the communication line connected to the wireless client device to the optical network unit according to the switching control signal sent by the control module, so that the uplink signal of the communication service is switched to the optical network unit;

Step 309. The optical network unit transmits the uplink signal of the communication service to the optical line terminal, and completes switching of the communication service line.

Similarly, after the power meter in the optical network unit detects that the power of the signal is higher than the set threshold power, the power meter directly sends the information of the received signal to the control module, and the control module controls the optical switch to transmit the communication service Switch to the optical fiber communication system, that is, steps 302-306 can be omitted.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: Modifications to the specific implementation of the present invention or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, should be included in the scope of the technical solution claimed in the present invention.

Claims (10)

1. An optical fiber access network, comprising an optical fiber communication system, which is provided with an optical line terminal, an optical distribution network, an optical network unit, and an integrated access device at a user end, and is characterized in that it also includes a wireless base station, The wireless base station is connected in communication with the optical line terminal; the wireless base station is connected in wireless communication with the wireless user end equipment; the wireless user end equipment and the optical network unit are respectively connected with the communication service switching device for switching the communication line connected, the wireless client equipment is also communicatively connected to the optical network unit, and the communication service switching device is connected to the integrated access device at the user end; the optical network unit is provided with a detection module for detecting signals and A control module for sending a switching control signal to the communication service switching device. 2. The optical fiber access network according to claim 1, wherein the communication service switching device is integrated with the optical network unit. 3. The optical fiber access network according to claim 1, wherein the detection module is connected to the control module. 4. The optical fiber access network according to claim 1, 2 or 3, characterized in that, the optical network unit is also provided with an alarm module for generating signal loss alarm information when the detection module fails to detect the signal , the alarm module is connected to the service interface function module inside the optical network unit. 5. The optical fiber access network according to claim 4, wherein the alarm module and the detection module are integrated. 6. The optical fiber access network according to claim 5, wherein the detection module is an amplitude, power and/or energy detection device. 7. A communication protection method based on the optical fiber access network according to any one of claims 1-6, wherein the communication service switching device switches the communication service from the optical fiber communication system to the wireless communication system, comprising the following steps: Step 1. The amplitude, power and/or energy of the signal detected by the detection module is less than a preset threshold, and the signal loss information is sent to the control module; Step 2. The control module sends a switching control signal to the control communication service switching device; Step 3. The communication service switching device switches the communication line connected to the optical network unit to the wireless client device according to the switching control signal, so that the uplink signal of the communication service is switched to the wireless client device; Step 4. The wireless client equipment transmits the uplink signal to the wireless base station; Step 5. The wireless base station sends a downlink signal to the wireless client equipment to complete the switching of communication service lines. 8. The communication protection method for optical fiber access network according to claim 7, characterized in that, between said step 1 and step 2, the following steps are further arranged: Step 11. The detection module sends the signal loss information to the alarm module; Step 12. The alarm module generates signal loss alarm information, and transmits this information to the wireless client device; Step 13. The wireless client equipment sends information requesting bandwidth allocation to the wireless base station; Step 14. The wireless base station allocates corresponding bandwidth to the wireless client equipment, and sends confirmation information that the bandwidth has been allocated; Step 15. The wireless client device sends request information for switching the communication service to the wireless communication system to the control module. 9. The communication protection method of the optical fiber access network according to claim 7, characterized in that, after the step 5, the communication service switching device switches the communication service from the wireless communication system back to the optical fiber A communication system, the operation of which includes the steps of: Step 6. The detection module detects that the amplitude, power and/or energy of the signal from the optical line terminal is higher than the preset threshold, and sends received signal information to the control module; Step 7. The control module sends a switching control signal to the control module; Step 8. The communication service switching device switches the communication line connected to the wireless client equipment to the optical network unit according to the switching control signal, so that the uplink signal of the communication service is switched to the optical network unit; Step 9. The optical network unit transmits the uplink signal of the communication service to the optical line terminal to complete the switching of the communication service line. 10. The communication protection method of an optical fiber access network according to claim 9, characterized in that, between said step 6 and step 7, the following steps are further arranged: Step 61. The detection module sends the received signal information to the alarm module; Step 62. The alarm module sends signal loss alarm release information to the wireless client device; Step 63. The wireless client equipment sends bandwidth release request information to the wireless base station; Step 64. The wireless base station releases the bandwidth, and sends bandwidth release confirmation information to the wireless client equipment; Step 65. The wireless client equipment sends request information for restoring communication services to the optical fiber communication system to the control module.

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