CN1964241A - Optical fiber communication network system and access device and method for node at the above system - Google Patents

Abstract

The invention discloses a node access device in an optical fiber network, comprising: an optical switching module, used to disconnect the node from the network according to the bypass switching instruction of the optical switching control module, and directly connect the optical fibers on both sides of the node ; An optical switching control module, configured to send a bypass switching instruction to the optical switching module. The invention also discloses a method for node access in an optical fiber network, including: step A, monitor whether the node needs to be disconnected from the network, if so, execute step B, otherwise return to execute step A; step B, connect the node Disconnect from the network and directly connect the fibers on either side of the node. Finally, the invention discloses an optical fiber communication system using the node access device and method. By adopting the technical solution disclosed in the present invention, when a node goes offline, the optical fibers on both sides of the node can be connected, so that the communication path passing through the node will not be interrupted due to the node going offline, thereby ensuring the communication of other nodes in the network stability.

Description

An optical fiber communication network system and its node access device and method

technical field

The invention relates to optical fiber communication technology, in particular to a node access device and method in an optical fiber network, and an optical fiber communication network system using the access device and method.

Background technique

In fiber optic communications, interruptions in communication paths are often caused by fiber failures or node dropouts. Existing optical fiber communication is usually used in MAN or WAN, and for MAN or WAN, the equipment at each node generally has good power supply conditions and disaster recovery solutions, and it is not easy for nodes to go offline. Therefore, the prior art mainly aims at maintaining services of other nodes from being interrupted when a communication path is interrupted due to a fiber failure. In order to achieve this goal, the existing technology increases the number of optical fibers when establishing a network and introduces backup optical fibers, such as dual-fiber or four-fiber; it is matched with a network protocol with self-healing characteristics, which automatically activates the backup when the working optical fiber fails Optical fiber, such as the network switching protection mechanism in SDH/SONET system. These technologies have a good effect on dealing with the interruption of the communication path caused by the failure of the optical fiber, so that the metropolitan area network or wide area network has relatively good reliability.

However, as optical fiber communication is more and more used in access networks, communication path interruptions caused by node dropouts are becoming more and more common. This is because the power supply conditions of each node in the access network are very different, and it is usually only turned on when in use; at the same time, it is not economically feasible to establish a disaster recovery backup for each node, so it is easy for nodes to go offline Case. For a node that goes offline, all communication paths passing through the node are completely interrupted, which is equivalent to the failure of both the working optical fiber and the backup optical fiber. In most cases, even if switching protection is performed, the work of other nodes cannot be maintained.

Figure 1 shows the situation that a node goes offline in a dual-fiber ring network. In a dual-fiber ring network, there are two rings where signals flow in opposite directions, which are called clockwise rings and counterclockwise rings. Taking node A as an example, node A needs to communicate with access point D in order to be able to access a wide area network or a metropolitan area network. During normal operation, the data sent from node A to access point D passes through node B and node C in turn to reach access point D through a clockwise ring; while the data sent from access point D to node A passes through node C in turn through a counterclockwise ring and node B reaches node A. If node B goes offline, the switching protection mechanism in the protocol allows the data sent by node A to access point D to pass through node G, node F and node E in turn through the counterclockwise ring; while the data sent by access point D to node A Go through node E, node F and node G sequentially through a clockwise loop. In this way, except for the faulty node, other nodes can still communicate normally. However, if both node B and node G are offline, node A cannot communicate with access point D no matter through the clockwise ring or the counterclockwise ring. If the dual-fiber is changed to four-fiber, or to a single-fiber capable of bidirectional transmission, the conclusion is the same.

Figure 2 shows the situation that a node in a four-fiber chain network goes offline. In the four-fiber chain network, if a node goes offline, all communication paths through it will be interrupted, so all nodes on the side away from the access point cannot communicate with the access point, resulting in service interruption of these nodes. For example, when node C goes offline, services of node A and node B are interrupted.

It can be seen that, in the prior art, when a node goes offline, all communication paths passing through the node will be interrupted, so that some other nodes cannot communicate normally, resulting in service interruption of these nodes.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a device and method for node access in an optical fiber network and an optical fiber communication network system using the access device and method, so as to avoid The communication path is completely interrupted, which affects the normal communication of other nodes.

In order to achieve the above object, the present invention provides a node access device in an optical fiber network, which device includes the following modules:

The optical switching module is used to disconnect the node from the network according to the bypass switching instruction of the optical switching control module, and directly connect the optical fibers on both sides of the node when the node is disconnected from the network;

The optical switching control module is configured to send a bypass switching instruction to the optical switching module.

Wherein, the optical switching control module is further used to issue an access switching instruction to the optical switching module, and the optical switching module is further used to connect the node to the network and disconnect the nodes on both sides according to the access switching instruction of the optical switching control module. Fiber optic direct connection.

Wherein, the optical switching module includes a first optical switch, a second optical switch, a third optical switch, and a fourth optical switch, and each optical switch has four interfaces, which are optical fiber interface, optical switch interface, back-end interface and Control interface; the optical fiber interfaces of the first optical switch and the second optical switch are respectively connected to the east optical fibers on both sides of the node, and the optical switch interfaces of the first optical switch and the second optical switch are connected; the optical switch interfaces of the third optical switch and the fourth optical switch The optical fiber interfaces are respectively connected to the west optical fibers on both sides of the node, and the optical switch interfaces of the third optical switch and the fourth optical switch are connected; the back-end interface of each optical switch is connected to the back-end processing module on the node; The control interfaces are all connected to the optical switch control module; the optical fiber interface of each optical switch is connected with the optical switch interface or the back-end interface of the optical switch inside the optical switch.

Wherein, the optical switching module includes a first optical switch and a second optical switch, and each optical switch has four interfaces, which are respectively an optical fiber interface, an optical switch interface, a back-end interface and a control interface; the first optical switch and the second optical switch The optical fiber interfaces of the optical switches are respectively connected to the optical fibers on both sides of the node, and the optical switch interfaces of the two optical switches are connected; the back-end interface of each optical switch is connected to the back-end processing module on the node; the control interface of each optical switch is It is connected to the optical switch control module; the optical fiber interface of each optical switch is connected with the optical switch interface or the back-end interface of the optical switch inside the optical switch.

Wherein, the optical switching control module is connected to the node power supply and sends a switching instruction according to the state of the node power supply. When the node power supply is interrupted, the optical switching control module sends a bypass switching instruction, and the node is bypassed by the optical switching module; The switching control module issues an access switching command, and the optical switching module connects the nodes.

Wherein, the node power supply includes a node main power supply and a node backup power supply, the node power supply interruption means that the node main power supply and the node backup power supply are all interrupted, and the node power supply recovery is the recovery of any one or both of the node main power supply and the node backup power supply. All recovered.

Wherein, the node access device further includes:

The timer module is used to start counting when the power is restored, and judge whether the power is not interrupted again within a predetermined time, and if so, let the optical switching control module send an access switching command to the optical switching module.

The present invention also provides an optical fiber communication network system, the system includes nodes connected through an optical fiber communication channel, and further includes a node access device, the device includes:

The optical switching module is used to disconnect the node from the network according to the bypass switching instruction of the optical switching control module, and directly connect the optical fibers on both sides of the node when the node is disconnected from the network;

The optical switching control module is configured to send a bypass switching instruction to the optical switching module.

The system further includes:

The network management device is used to send a device network management signal to the node.

Wherein, the communication channel between the network management device and the node is an optical fiber communication channel.

Wherein, the communication channel between the network management device and the node is an additional network management communication channel established for network management communication.

The present invention also provides a method for node access in an optical fiber network, the method comprising:

Step A, monitor whether the node needs to be disconnected from the network, if so, execute step B, otherwise return to execute step A;

Step B, disconnect the node from the network, and directly connect the optical fibers on both sides of the node.

Wherein, after step B, further include:

Step C, monitor whether the node needs to be connected to the network, if so, execute step D, otherwise return to execute step C;

Step D, connect the node to the network and disconnect the direct connection of the optical fibers on both sides of the node, and return to step A.

Wherein, whether the monitoring needs to disconnect the node from the network is:

Monitor whether the node power supply is working normally. If the node is not working properly, it is considered that the node needs to be disconnected from the network.

Wherein, whether the monitoring needs to disconnect the node from the network is:

It is monitored whether the equipment network management signal indicating to disconnect the node from the network is received, and if received, it is considered that the node needs to be disconnected from the network.

Among them, whether the monitoring needs to connect the node to the network is:

Monitor whether the node power supply returns to normal operation. If the node power supply returns to normal operation, it is considered that the node needs to be connected to the network.

Among them, whether the monitoring needs to connect the node to the network is:

Monitor whether the equipment network management signal indicating to connect the node to the network is received, and if received, it is considered that the node needs to be connected to the network.

Wherein, further include between step C and step D:

Step E1, start the timer;

Step E2, judging whether the timer reaches the preset time value, if so, execute step D, otherwise execute step E3;

Step E3, monitor whether the node power supply is working normally, if so, return to step E2, otherwise, execute step E4;

Step E4, stop the timer and reset the timer value to the initial value, return to step C.

Wherein, the node power supply includes a node main power supply and a node backup power supply.

Wherein, the normal operation of the node power supply is: any one of the node main power supply and the node backup power supply works normally, or both the node main power supply and the node backup power supply work normally.

Using the node access device and method provided by the present invention and the optical fiber communication network system using the access device and method can connect the optical fibers on both sides of the node when the node is offline, so that the communication path passing through the node It will not be interrupted due to node disconnection, thus ensuring the stability of communication with other nodes in the network. Moreover, even if the power supply of the node is normal, if the node fails, the network management can issue a command to bypass or connect the node forcibly, so that it is more convenient for the network management to manage the access network. At the same time, if the redundant configuration is adopted, frequent changes in the network structure caused by the frequent connection or interruption of the power supply of the node equipment can also be avoided.

Description of drawings

FIG. 1 is a schematic diagram of node disconnection in a dual-fiber ring network in the prior art.

Fig. 2 is a schematic diagram of a node disconnection in a four-fiber chain network in the prior art.

Fig. 3 is a block diagram of Embodiment 1 of a node access device provided by the present invention.

Fig. 4 is a block diagram of Embodiment 2 of the node access device provided by the present invention.

Fig. 5 is a flow chart of the node access method provided by the present invention.

Fig. 6 is a schematic diagram of an optical fiber communication network system provided by the present invention.

Detailed ways

The node access device and method provided by the present invention and the optical fiber communication network system using the access device and method can bypass the node and connect the optical fibers on both sides of the node when the node is offline, so that the optical fiber The disconnection of any node in the network will not cause communication interruption of other nodes.

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 3 . FIG. 3 is a block diagram of Embodiment 1 of a node access device provided by the present invention. This embodiment is used in a dual-fiber network. The node access device provided by the present invention includes the following modules:

The optical switching module 301 includes an optical switch 302, an optical switch 303, an optical switch 304, and an optical switch 305, and is used to bypass or connect the node device to the network according to the control of the optical switch control module, and connect the two nodes to the network when the node device is bypassed. The optical fiber on the side is directly connected;

The optical switching control module 306 is configured to switch the state of the optical switching module 301 according to an external signal.

Each optical switch includes four interfaces, namely an optical fiber interface, an optical switch interface, a back-end interface and a control interface. The optical fiber interface is connected to the external optical fiber; the optical switch interface is connected to another optical switch inside the node access device; the back-end interface is connected to the back-end processing interface of the device, and further connected to the back-end processing module on the node; the control interface is connected to To the optical switch control module, used for receiving control information to switch the internal connection of the optical switch.

When the node works normally, the back-end interface A1 in the optical switch 302 is connected to the fiber interface A2, the back-end interface B1 in the optical switch 303 is connected to the fiber interface B2, and the back-end interface C1 in the optical switch 304 is connected to the fiber interface C2. The back-end interface D1 in the optical switch 305 communicates with the optical fiber interface D2. The optical switch interface A3 of the optical switch 302 is connected to the optical switch interface B3 of the optical switch 303 , and the optical switch interface C3 of the optical switch 304 is connected to the optical switch interface D3 of the optical switch 305 . The received data packets on the eastbound optical fiber enter the optical switch 302 through the optical fiber interface A2 of the optical switch 302 from the eastbound optical fiber input interface of the access device, and enter the node through its back-end interface A1 for back-end processing; The data packet is sent by the node, enters the optical switch from the back-end interface B1 of the optical switch 303, and then outputs to the east optical fiber through the optical fiber interface B2 of the optical switch 303 through the east optical fiber output interface of the access device. The westward optical fiber input interface of the receiving data packet access device on the westward optical fiber enters the optical switch 305 through the optical fiber interface D2 of the optical switch 305, and enters the node through its back-end interface D1 for back-end processing; the sending data packet on the westward optical fiber is sent by the node It is transmitted from the rear interface C1 of the optical switch 307 into the optical switch, and then output to the west optical fiber through the optical fiber interface C2 of the optical switch 307 through the west optical fiber output interface of the access device. Whether the data packet to be sent by the node enters the east-bound fiber or the west-bound fiber is determined by the back-end processing module on the node.

When the node is bypassed, the optical fiber interface A2 of the optical switch 302 is disconnected from the rear-end interface A1, and the optical fiber interface A2 is connected to the optical switch interface A3; the optical fiber interface B2 of the optical switch 303 is disconnected from the rear-end interface B1, and the optical fiber interface B2 It communicates with the optical switch interface B3. In this way, the optical signal on the eastbound fiber re-enters the eastbound fiber from the fiber interface A2 of the optical switch 302 through its optical switch interface A3, then through the optical switch interface B3 and the fiber interface B2 of the optical switch 303. This is equivalent to directly connecting the eastbound optical fibers on both sides of the node, and at the same time the node is disconnected from the optical fiber, thereby realizing the bypass of the node on the eastbound optical fiber. The optical fiber interface C2 of the optical switch 304 is disconnected from the back-end interface C1, and the optical fiber interface C2 is connected to the optical switch interface C3; the optical fiber interface D2 of the optical switch 305 is disconnected from the back-end interface D1, and the optical fiber interface D2 is connected to the optical switch interface D3. In this way, the optical signal on the west optical fiber re-enters the west optical fiber from the optical fiber interface D2 of the optical switch 305 through its optical switch interface D3 and then through the optical switch interface C3 and optical fiber interface C2 of the optical switch 304 . This is equivalent to directly connecting the west-bound optical fibers on both sides of the node, and at the same time the node is disconnected from the optical fiber, thereby realizing the bypass of the node on the west-bound optical fiber.

The optical switching performed by the optical switching module is controlled by the optical switching control module. In addition to controlling the interface of the optical switching module, the optical switching module also has a power supply interface and/or an equipment network management interface. The power supply interface is connected to the power supply of the node equipment, and the equipment network management interface is connected to the network management communication line. When the power supply of the node is normal, the power supply of the node access device is also normal. At this time, the optical switch can be switched by the equipment network management signal received from the equipment network management interface. When the power supply of the node is interrupted, the power supply of the node access device is interrupted accordingly, and the optical switch enters a default state, that is, the optical fiber interface is connected to the optical switch interface, thereby bypassing the node.

There are two sources of equipment network management signals, one is to form a separate network management network through another communication line; the other is to use the existing optical fiber to use the normal communication mode when the node is working normally, and to use the normal communication mode when the node is bypassed. By adding low-frequency, low-power communication signals to the light, it is extracted by an optical splitter as a one-way communication from the network management to the node access device. For example, a 2MHz low-frequency signal with a wavelength of 1510nm is added to the optical fiber, and it is separated and detected by a 1:99 optical splitter in front of the access device, or directly detected by a power detector, and sent to the equipment network management of the access device interface and further into the control panel of the access device. The control board decides when to switch the optical switch based on the received information, and connect the node equipment to the network or bypass it.

In view of the possibility that the node power supply is frequently interrupted and connected in a short period of time, in order to avoid frequent changes of the network topology due to this situation in a short period of time, the following two redundant configurations can be used. The first is to equip the nodes with a backup power supply or an emergency power supply. At the same time, the power interface of the optical switch switching control module is not only connected to the node main power supply, but also connected to the node backup power supply or emergency power supply. When the main power supply of the node is interrupted, it can be short Time to keep nodes online without bypassing them. The other is to control the optical switching module to delay for a certain period of time when the power supply of the node is restored, and then switch to connect the node. If the power supply of the node is interrupted again within the delay time, the node will be disconnected from the network until the power supply of the node is stable. To realize the delay, the device network management signal can be used, or a timer can be added inside the node access device.

Please refer to FIG. 4 , which is a block diagram of Embodiment 2 of a node access device provided by the present invention. This embodiment is used in a single-fiber bidirectional network.

In a single-fiber bidirectional network, each optical fiber can transmit optical signals in two directions at the same time, which is usually realized by technologies such as wavelength division multiplexing and space division multiplexing. The node access device for single-fiber bidirectional network provided by the present invention includes:

The optical switching module 401 includes an optical switch 402 and an optical switch 403, which are used to bypass or connect the node equipment to the network according to the control of the optical switching control module, and directly connect the optical fibers on both sides of the node when the node is bypassed;

The optical switching control module 404 is configured to switch the state of the optical switching module 401 according to an external signal.

Each optical switch includes four interfaces, namely an optical fiber interface, an optical switch interface, a back-end interface and a control interface. The optical fiber interface is connected to the external optical fiber; the optical switch interface is connected to another optical switch inside the node access device; the back-end interface is connected to the back-end processing interface of the device, and further connected to the back-end processing module on the node; the control interface is connected to To the optical switch control module, used for receiving control information to switch the optical switch.

During normal operation, the back-end interface E1 in the optical switch 402 is connected to the optical fiber interface E2, the back-end interface F1 in the optical switch 403 is connected to the optical fiber interface F2, and the optical switch interface E3 of the optical switch 402 is connected to the optical switch interface F3 of the optical switch 403. connected. The optical fiber on the west side, that is, the optical fiber connected to the optical fiber interface E2 of the optical switch 402, the received data packet on the optical switch 402 enters the optical switch 402 from the optical fiber interface E2 of the optical switch 402, and enters the node through its back-end interface E1 for back-end processing; The sending data packet on the optical fiber is sent by the node, enters the optical switch from the back-end interface E1 of the optical switch 402, and then outputs to the west optical fiber through the optical fiber interface E2 of the optical switch 402. The optical fiber on the east side, that is, the optical fiber connected to the optical fiber interface F2 of the optical switch 403, the received data packet on the optical switch 403 enters the optical switch 403 from the optical fiber interface F2 of the optical switch 403, and enters the node through its back-end interface D1 for back-end processing; The sending data packet on the optical fiber is sent by the node, enters the optical switch from the back-end interface F1 of the optical switch 403, and then outputs to the west optical fiber through the optical fiber interface F2 of the optical switch 403. Whether the data packet to be sent by the node enters the west fiber or the east fiber is determined by the back-end processing module.

When switching to bypass the node, the optical fiber interface E2 of the 402 of the optical switch is disconnected from the back-end interface E1, and the optical fiber interface E2 is connected to the optical switch interface E3; the optical fiber interface F2 of the 403 of the optical switch is disconnected from the back-end interface F1, The optical fiber interface F2 communicates with the optical switch interface F3. In this way, it is equivalent to directly connecting the east fiber and the west fiber, and the node is disconnected from the fiber, thereby realizing the bypass of the node.

The implementation manner of the optical switching control module is the same as that in the first embodiment.

Please refer to FIG. 5 , which is a flowchart of a node access method provided by the present invention.

Step 501, connect the node to the network.

Step 502, monitor whether the main power supply and backup power supply of the node are not working properly, if so, go to step 503, otherwise go to step 502 to continue monitoring. Abnormal operation refers to interruption of power supply.

Step 503, disconnect the node from the network, and connect the optical fibers on both sides of the node. For a single-fiber network, the fibers on both sides of the node are directly connected; for a dual-fiber network, the eastbound fibers on both sides of the node are directly connected, and the westbound fibers on both sides of the node are directly connected.

Step 504, monitor whether the main power supply and backup power supply of the node are not working normally, if so, execute step 504 to continue monitoring, otherwise execute step 505.

Step 505, start a timer.

Step 506, judging whether the timer reaches a preset time. If yes, it is considered that the power supply has been stabilized, and step 507 is executed; otherwise, step 508 is executed.

In step 507, the node is connected to the network, and the direct connection of the optical fibers on both sides of the node is disconnected, and the execution returns to step 502.

Step 508 , monitor whether the main power supply and backup power supply of the node are working abnormally, if so, consider that the current power supply is unstable, and execute step 509 , otherwise return to execute step 506 .

Step 509 , stop the timer and reset the timer to an initial value, and return to step 504 .

During normal operation of the main power supply and/or backup power supply of the node, the node can also be disconnected from the network according to the equipment network management signal and the optical fibers on both sides of the node can be connected. The equipment network management signal can be transmitted through a dedicated equipment network management signal channel, or can be transmitted through an existing optical fiber communication channel.

Please refer to FIG. 6 , which is a schematic diagram of an optical fiber communication network system provided by the present invention.

The system includes node A, node B, node C, node D, node E, node F, node G and the access device A1, access device B1, access device C1, access device E1, The access device F1 and the access device G1 are connected by optical fibers to form a bidirectional ring network. When a node is disconnected from the network, only the connection between the node and the corresponding access device is disconnected, and the access device can keep the optical fibers on both sides connected, thus ensuring the integrity of the communication path in case of node failure. Node D is the access point connecting the access network and the metropolitan area network, and usually adopts a special disaster recovery system. Generally speaking, the network management equipment is also located at node D. The equipment network management signals sent by the network management equipment to other nodes can be transmitted through optical fiber communication channels or through dedicated network management communication channels.

It should be noted that although the node access device and method provided by the present invention are mainly aimed at node access in an access network, they are not limited to be used in an access network. In other occasions where some other nodes cannot communicate normally due to node disconnection, the node access device provided by the present invention can be used.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (20)

1, the node access device in a kind of fiber optic network is characterized in that, this device comprises with lower module:

The light handover module is used for according to the bypass switching command of light switching controls module node being disconnected from network, and the optical fiber of node both sides directly is communicated with when network disconnects at node;

Light switching controls module is used for sending the bypass switching command to the light handover module.

2, the node access device in the fiber optic network according to claim 1, it is characterized in that, described smooth switching controls module is further used for sending the access switching command to the light handover module, and described smooth handover module is further used for according to the direct connection with node access network and disconnected node two side optical fibers of the access switching command of light switching controls module.

3, the node access device in the fiber optic network according to claim 1, it is characterized in that, described smooth handover module comprises first optical switch, second optical switch, the 3rd optical switch and the 4th optical switch, each optical switch has four interfaces, be respectively optical fiber interface, optical switch interface, back end interface and control interface; The optical fiber interface of first optical switch and second optical switch is the east orientation optical fiber of connected node both sides respectively, and the optical switch interface of first optical switch and second optical switch links to each other; The west of the optical fiber interface difference connected node both sides of the 3rd optical switch and the 4th optical switch is to optical fiber, and the optical switch interface of the 3rd optical switch and the 4th optical switch links to each other; The back end interface of each optical switch all is connected to the back end processing module on the node; The control interface of each optical switch all is connected to light switching controls module; The optical fiber interface of each optical switch links to each other with the optical switch interface or the back end interface of this optical switch in this optical switch inside.

4, the node access device in the fiber optic network according to claim 1, it is characterized in that described smooth handover module comprises first optical switch and second optical switch, each optical switch has four interfaces, be respectively optical fiber interface, optical switch interface, back end interface and control interface; The optical fiber interface of first optical switch and second optical switch is the optical fiber of connected node both sides respectively, and the optical switch interface of two optical switches links to each other; The back end interface of each optical switch all is connected to the back end processing module on the node; The control interface of each optical switch all is connected to light switching controls module; The optical fiber interface of each optical switch links to each other with the optical switch interface or the back end interface of this optical switch in this optical switch inside.

5, the node access device in the fiber optic network according to claim 1 and 2, it is characterized in that, described smooth switching controls module is connected to node power and sends switching command according to the state of node power, interrupt time switching controls module when node power and send the bypass switching command, by the light handover module with the node bypass; Recover time switching controls module when node power and send the access switching command, node is inserted by the light handover module.

6, the node access device in the fiber optic network according to claim 4, it is characterized in that, described node power comprises node main power source and node stand-by power supply, it is that node main power source and node stand-by power supply all interrupt that described node power is interrupted, and it is that any one recovery or two recover in node main power source and the node stand-by power supply that described node power is recovered.

7, according to the node access device in claim 5 or the 6 described fiber optic networks, it is characterized in that described node access device further comprises:

The timer module is used for picking up counting when power up, and judges whether that power supply interrupts once more in the given time, inserts switching command to the light handover module if then allow light switching controls module send.

8, a kind of Networks of Fiber Communications system comprises the node that connects by fiber optic communication channel, it is characterized in that this system further comprises node access device, and this device comprises:

The light handover module is used for according to the bypass switching command of light switching controls module node being disconnected from network, and the optical fiber of node both sides directly is communicated with when network disconnects at node;

Light switching controls module is used for sending the bypass switching command to the light handover module.

9, Networks of Fiber Communications according to claim 8 system is characterized in that this system further comprises:

Network Management Equipment is used for sending equipment webmaster signal to node.

10, Networks of Fiber Communications according to claim 8 system is characterized in that the communication channel between described Network Management Equipment and the node is a fiber optic communication channel.

11, Networks of Fiber Communications according to claim 8 system is characterized in that, the communication channel between described Network Management Equipment and the node is to be the extra network management communication channel of setting up of network management communication.

12, the method that node inserts in a kind of fiber optic network is characterized in that this method comprises:

Steps A, whether monitoring needs node is disconnected from network, if execution in step B then, otherwise return execution in step A;

Step B disconnects node from network, and the optical fiber of these node both sides is directly coupled together.

13, the method that node inserts in the fiber optic network according to claim 12 is characterized in that, further comprises after step B:

Step C, whether monitoring needs the node access network, if execution in step D then, otherwise return execution in step C;

Step D with the direct connection of node access network and disconnected node two side optical fibers, returns execution in step A.

14, the method that node inserts in the fiber optic network according to claim 12 is characterized in that whether described monitoring needs is broken as node from network:

Whether the monitoring node power supply operate as normal, thinks and node need be disconnected from network if node work is undesired.

15, the method that node inserts in the fiber optic network according to claim 12 is characterized in that whether described monitoring needs is broken as node from network:

The monitoring whether receive indication with node from the equipment webmaster signal that network disconnects, node need be disconnected from network if receive then think.

16, the method that node inserts in the fiber optic network according to claim 13 is characterized in that, described monitoring whether need with the node access network be:

Whether the monitoring node power supply recovers operate as normal, if recover operate as normal then think need be with the node access network for node power.

17, the method that node inserts in the fiber optic network according to claim 13 is characterized in that, described monitoring whether need with the node access network be:

Whether monitoring receives the equipment webmaster signal of indication with the node access network, need be with the node access network if receive then think.

18, the method that node inserts in the fiber optic network according to claim 16 is characterized in that, further comprises between step C and the step D:

Step e 1 starts timer;

Step e 2 judges whether timer arrives predefined time value, if execution in step D then, otherwise execution in step E3;

Whether step e 3, monitoring node power supply operate as normal, if then return execution in step E2, otherwise execution in step E4;

Step e 4, stopping timer and resetting timer value is initial value, returns execution in step C.

19, the method that inserts according to node in claim 14 or the 16 or 18 described fiber optic networks is characterized in that described node power comprises node main power source and node stand-by power supply.

20, the method that node inserts in the fiber optic network according to claim 19, it is characterized in that, described node power operate as normal is: node main power source and any one operate as normal of node stand-by power supply, or node main power source and node stand-by power supply operate as normal all.

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