CN1874201B - Optical network protection triggering method and device under sharing configuration of receiving equipment - Google Patents

Abstract

The invention discloses a method and device for triggering optical network protection under the shared configuration of receiving equipment. The method includes: selecting a single board to connect a working channel or a protection channel to a service receiving device, and the automatic protection switching controller according to the optical detection point of the working channel , the detection results of the optical detection point of the protection channel and the service signal detection point of the receiving device, judge whether the working channel and the protection channel fail, and control the switching of the selection board in the following manner: if the working channel If the working channel is good, the switching remains on the working channel; if the working channel fails and the protection channel is good, the switching remains on the protection channel; if the working channel fails and the protection channel fails, the switching remains on the working channel. The invention can effectively distinguish the recovery signal caused by switching and the recovery signal caused by the restoration of the working path, so as to avoid the wrong operation of the system.

Description

Optical network protection triggering method and device under sharing configuration of receiving equipment

technical field

The invention relates to the field of optical communication, in particular to the realization technology of optical transmission network protection switching using WDM (Wavelength Division Multiplexing) technology.

Background technique

In the current application of OTN protection switching, there are two system configuration modes for receiving equipment of protected service signals: redundant configuration of receiving equipment and shared configuration of receiving equipment, as shown in Figure 1 and Figure 2 respectively. For the receiving device redundancy configuration mode shown in Figure 1, a service signal receiving device 101 is configured on each of the working path and the protection path, which can detect the quality of the service signal on the path where it is located, respectively APS (Automatic Protection Switching) of the system , automatic protection switching) controller 102 (used to implement the APS protocol algorithm processing function) provides trigger signals for protection switching and restoration. For the shared configuration mode of receiving equipment shown in Figure 2, the service signals from the working channel and the protection channel first pass through the protection execution device (corresponding to the protection selection switch 103 in the figure) for signal selection and then arrive at the receiving device 101, that is, the working channel and the protection channel. The protection path shares the same receiving device, which is used to detect the service signal quality status on the current path, and provide the system APS controller with a trigger signal for protection switching and restoration. For the application in FIG. 1 , since the working channel and the protection channel have independent signal detection capabilities, there is no problem of coordinated processing of protection switching trigger criteria. However, for the configuration application of the shared receiving device shown in Figure 2, the service receiving device will detect signal recovery immediately after the switching of the system working path failure, but it should not trigger the protection recovery of the system (return to the working path ) operation; after the service signal is switched to the protection channel, the receiving device can only detect the signal status of the protection channel, and it will be difficult for the system to effectively restore the protection state after the working channel is normal.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and device for triggering optical network protection under the shared configuration of receiving equipment, so as to solve the problem that the existing technology cannot effectively distinguish the recovery signal caused by switching and the recovery signal caused by the repair of the working path. Technical problems to avoid erroneous operation of the system.

In order to achieve the above object, the present invention provides a method for triggering optical network protection under the shared configuration of receiving equipment. The channel light detection point, the protection channel light detection point, and the detection results of the service signal detection point of the receiving device determine whether the working channel and the protection channel fail, and control the selection board to switch in the following manner: One, if the working channel is good, the switch remains in the working channel; the second way, if the working channel fails and the protection channel is good, then the switching remains in the protection channel; the third way, if the working channel channel failure, if the protection channel fails, then the switching remains in the working channel.

The above method is characterized in that, using the alarm information and alarm disappearance information of the optical detection point of the working channel and the optical detection point of the protection channel to determine the transition of the good or fault state of the working channel and the protection channel, The status change is further confirmed by using the alarm information and alarm disappearance information of the service signal detection point.

The above-mentioned method is characterized in that, when the working channel is good and the switching remains at the initial condition of the working channel, the second method further includes the following steps:

Step a1, if the service signal detection point detects a signal failure, it means that the working channel has a failure, and the receiving device sends a switching trigger message to the switching controller;

Step b1, the switching controller sends a command message to the selected single board to perform a protection switching operation, connects the receiving device through the protection channel, and starts a timer with a time length of T at the same time;

Step c1, within the time T of the timer, if the switching controller receives the alarm disappearance message reported by the service receiving device, it means that the protection channel is good, and the connection of the protection channel is maintained.

The above-mentioned method is characterized in that, when the working channel is good and the switching remains at the initial condition of the working channel, the third method further includes in the step c1: within the time T of the timer, if If the switching controller does not receive the alarm disappearance message reported by the service receiving device, it means that the protection channel also fails, and then performs a recovery operation to re-maintain the connection of the working channel.

The above-mentioned method is characterized in that, when both the working channel and the protection channel fail, switching remains under the initial condition of the working channel, and the first method includes: if the switching controller receives the The alarm disappearance signal detected by the service signal detection point indicates that the status of the working channel is changed to good, and the connection of the working channel is continued.

The above-mentioned method is characterized in that, when both the working channel and the protection channel fail, the switching remains under the initial conditions of the working channel, and the second method includes:

Step a2, on the premise that the switching controller does not receive the alarm disappearance signal detected by the service signal detection point, if the switching controller receives the alarm disappearance message reported by the protection channel optical detection point, then Indicates that the status of the protection channel is changed to good;

Step b2, the switching controller sends a command message to the selected single board to perform a protection switching operation, connects the receiving device through the protection channel, and starts a timer with a time length of T at the same time;

Step c2, within the time T of the timer, if the switching controller receives the alarm disappearance message reported by the service receiving device, it means that the protection channel is good, and the connection of the protection channel is maintained.

The above-mentioned method is characterized in that, when both the working channel and the protection channel fail, the switching remains under the initial conditions of the working channel, and the third method further includes in the step c2: If the switching controller does not receive the alarm disappearance message reported by the service receiving device within the time T of the switch, it means that the protection channel is still faulty, and then performs a recovery operation to maintain the connection of the working channel again.

The above-mentioned method is characterized in that, when the working channel fails, the protection channel is good, and switching remains under the initial conditions of the protection channel, and the third method includes: if the switching controller receives the protection channel When the alarm reported by the optical detection point of the channel generates a message, the switching controller sends a command message to the selected single board to perform a switching recovery operation, and restore the connection to the working channel.

The above-mentioned method is characterized in that, when the working channel fails, the protection channel is good, and the switching remains under the initial condition of the protection channel, and the first method includes:

Step a3, on the premise that the switching controller does not receive the alarm generation message detected by the service signal detection point, if the switching controller receives the alarm disappearance message reported by the optical detection point of the working channel, then Indicates that the status of the working channel is changed to good;

Step b3, the switching controller sends a command message to the selected single board to perform a protection recovery operation, connects the receiving device through the working channel, and starts a timer with a time length of T at the same time;

Step c3: within the time T of the timer, if the switching controller receives the alarm disappearance message reported by the service receiving device, it confirms that the working channel is good, and keeps the connection of the working channel.

The above-mentioned method is characterized in that, when the working channel fails, the protection channel is good, and the switching remains under the initial condition of the protection channel, and the second method further includes in the step c3: Within the time T, if the switching controller does not receive the alarm disappearance message reported by the service receiving device, the working channel is still faulty, and the switching controller controls the selected single board to perform the switching operation, switching to the protection channel and maintain the connection of the protection channel.

The above method is characterized in that the length of the time T is greater than or equal to the sum of the maximum time required for the selected board to perform switching and the maximum time required for the receiving device to detect and confirm that the alarm disappears.

In order to better realize the purpose of the present invention, the present invention also provides an optical network protection trigger device under the shared configuration of receiving equipment, which is characterized in that it includes a selection board, service receiving equipment and an automatic protection switching controller; The selection single board connects the working channel or the protection channel to the receiving device; the switching controller is used for: according to the detection results of the working channel optical detection point, the protection channel optical detection point and the service signal detection point of the receiving device, Judging whether the working channel and the protection channel are faulty, and controlling the selection board to switch in the following manner: if the working channel is good, the switch remains on the working channel; if the working channel fails, the If the protection channel is good, the switching remains on the protection channel; if the working channel fails and the protection channel fails, the switching remains on the working channel.

The technical effect of the present invention is that: the present invention can effectively distinguish the recovery signal caused by the switching and the recovery signal caused by the repair of the working path for the situation that the receiving equipment shares the configuration, and avoids the erroneous operation of the system.

Description of drawings

FIG. 1 is a schematic diagram of a redundant configuration of a receiving device;

FIG. 2 is a schematic diagram of receiving device sharing configuration;

Fig. 3 is a flow chart of triggering the shared receiving device protection provided by the present invention;

Fig. 4 is a schematic diagram of an application example of 1+1 protection provided by the present invention.

Detailed ways

The specific technical implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and application examples.

The present invention proposes a corresponding solution to the problem of reliable triggering of system protection switching under the configuration application situation of shared receiving equipment. Figure 3 is a flowchart of triggering protection of shared receiving equipment.

1) First, it is necessary to comprehensively share the trigger information of each detection point that can be provided by the protection device. The device shown in Figure 2 can provide the following three detection points: service signal detection point, working channel optical detection point, and protection channel optical detection point.

2) When the "service signal detection point" detects a signal failure, the OTU sends an APS trigger message to the APS controller through the communication control bus, and the APS controller sends a command message to the protection selection switch module through the communication control bus to perform protection switching operations ; At the same time, start a timer with a time length of T, and the time length of T should not be less than the sum of "the maximum time T1 required for the protection selection switch to perform switching" and "the maximum time T2 required for the OTU detection confirmation alarm to disappear".

3) During the time from the start of the timer to the end of the timer, if the APS controller receives the alarm disappearance message reported by the service receiving equipment, the protection selection switch remains in the protection switching state; if the APS controller does not receive the alarm disappearance reported by the service receiving equipment message, it is determined that there is a fault in the protection path, and the APS controller sends a command message to the protection selection switch through the communication control bus to perform the operation of returning to the working path.

After step 3), if the state of the optical switch is the working channel state (the alarm state of the corresponding service receiving equipment is always in the state of alarm generation), then proceed as follows:

4) Afterwards, if the APS controller receives the alarm disappearance signal detected by the "service signal detection point", it can determine that the alarm of the working channel has disappeared, and the state of the protection selection switch continues to maintain the state of the working channel. Return to the processing status of step 1).

5) Thereafter, under the premise that the APS controller does not receive the alarm disappearance signal detected by the "service signal detection point", when the APS controller receives the alarm disappearance message reported by the "protection channel optical detection point", the APS controller Control the protection selector switch to perform the protection switching operation, and start a timer with a time length of T (the time length of T is set as specified in the previous step 2) at the same time. During the time from timer start to timing end, if the APS controller receives the alarm disappearance message reported by the service receiving equipment, then the protection selection switch maintains the protection switching state, and then the processing steps continue to step 6); if no service is received When the alarm disappearance message reported by the receiving device is determined, there is still a fault in the protection channel, and the APS controller sends a command message to the protection selection switch through the communication control bus to perform a recovery operation, return to the working channel, and the processing steps return to step 4).

After step 3), if the state of the optical switch remains in the state of the protection channel (the alarm state corresponding to the working channel is in the state of alarm generation), then proceed as follows:

6) If the APS controller receives the alarm message reported by the "protection channel optical detection point", the APS controller sends a command message to the protection selection switch through the communication control bus to perform switching and recovery operations and restore to the working channel. Processing steps go to step 4).

7) On the premise that the APS controller does not receive the alarm generation message reported by the "protection channel optical detection point", when the APS controller receives the alarm disappearance message reported by the "working channel optical detection point", the APS controller will Send a command message through the communication control bus to the protection selection switch to perform the protection recovery operation, and start a timer with a time length of T at the same time. The time length of T is set with the previous step 2). Within a certain period of time, if the APS controller receives the alarm disappearance message reported by the service receiving equipment, the control protection selection switch remains in the recovery state, and the processing steps return to step 1); if the APS controller does not receive the alarm disappearance message reported by the service receiving equipment, it is determined If there is still a fault in the working channel, the APS controller controls the protection selection switch to perform a switching operation, switching to the protection channel, and the processing steps return to step 6).

As shown in Figure 4, it is a schematic diagram of the application of point-to-point 1+1 protection in the optical transmission system, in which the service signal is divided into two parts at the source node and transmitted to the destination node along the working channel The selection board (OP board) receives service signals from the working channel and the protection channel respectively. The OP board itself provides optical power detection for the working channel and the protection channel. After the OP board, the selected service signal is sent to The connected service receiving board OTU, the OTU board can perform real-time detection of alarms such as loss of signal (LOS), loss of frame (LOF), and bit error limit (BER) of the service signal and report to the APS controller board, Then the APS control board sends a switch switching operation to the APS execution board (OP board) according to the protection protocol algorithm.

When only position ① fails, the OTU detects the LOS alarm and generates a message, and sends a message to the APS control board through the control bus, and the APS control board controls the APS to execute the board OP to perform protection switching operations, and at the same time start the timer T=T1 +T2＝50ms+300ms＝350ms, where T1 is the maximum time required for the OP board to perform switching, and T2 is the maximum time required for the OTU board to detect and confirm that the alarm disappears; within the T timing time range, the APS control board receives the OTU Detect and report that the signal returns to normal, and control the OP to maintain the protection switching state. After the fault at position ① is repaired, the optical detection point of the OP working channel detects that the optical power returns to normal and reports to the APS control board, and the APS control board controls The OP board executes the operation of returning to the working channel, and at the same time starts the timer T (the value of T is 350ms). Within the time limit of T, the APS control board receives the signal returned to normal after the OTU detection report, and then controls the OP to maintain the working state. path status.

When a fault occurs at position ①, the OTU signal detection point detects a signal fault and reports a Loss of Signal (LOS) alarm on the APS control board, and the APS control board controls the OP board to switch to the protection channel. When a fault occurs at position ②, after receiving the protection channel optical power alarm signal from the OP, the APS control board will immediately control the OP board to perform recovery operations, and the OP will return to the working channel state. After the fault at position ② is repaired, the optical detection point of the OP protection channel detects that the optical power returns to normal and reports to the APS control board, and the APS control board controls the OP board to switch to the protection channel, and starts the timer T( T takes a value of 350ms), and within the T timing time range, the APS control board receives the OTU detection report signal recovery message, and then controls the OP to maintain the protection path state.

When only position ② fails, the APS control board of the system only needs to mark the alarm status of the protection channel as "alarm generation", and the APS control board will not control the OP board to perform any operations, and the OP remains in the working channel state. When a fault occurs at position ②, the APS control board of the system only needs to mark the alarm status of the protection channel as "alarm generation", and then when a fault occurs at position ①, the APS control board receives the alarm signal of the optical power failure of the protection channel of the OP Afterwards, the OP board will be controlled to perform recovery operations, and the OP board will be restored to the working channel state. After the fault at position ② is repaired, the optical detection point of the OP protection channel detects that the optical power returns to normal and reports to the APS control board, and the APS control board controls the OP board to switch to the protection channel, and starts the timer T( T takes a value of 350ms), and within the T timing time range, the APS control board receives the OTU detection report signal recovery message, and then controls the OP to maintain the protection path state.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the implementation scope of the present invention; all equivalent changes and modifications made according to the present invention are covered by the patent scope of the present invention.

Claims (9)

1. A method for triggering optical network protection under shared configuration of receiving equipment, characterized in that a single board is selected to connect a working channel or a protection channel to a service receiving device, and the automatic protection switching controller is based on the optical detection point of the working channel, the protection channel Based on the detection results of the light detection point and the service signal detection point of the receiving device, it is judged whether the working channel and the protection channel are faulty, and the switching of the selection board is controlled in the following manner: Mode 1, if the working channel is good, the switching remains in the working channel; Mode 2, if the working channel is faulty and the protection channel is good, switching remains in the protection channel; Mode 3, if the working channel is faulty and the protection channel is faulty, switching remains in the working channel; Use the alarm information and alarm disappearance information of the optical detection point of the working channel and the optical detection point of the protection channel to determine the transition of the good or fault state of the working channel and the protection channel, and use the service signal detection point The alarm information and the alarm disappearance information further confirm the state change; When the working channel is good and the switching remains under the initial conditions of the working channel, the second method further includes the following steps: Step a1, if the service signal detection point detects a signal failure, it means that the working channel has a failure, and the receiving device sends a switching trigger message to the switching controller; Step b1, the switching controller sends a command message to the selected single board to perform a protection switching operation, connects the receiving device through the protection channel, and starts a timer with a time length of T at the same time; Step c1, within the time T of the timer, if the switching controller receives the alarm disappearance message reported by the service receiving device, it means that the protection channel is good, and the connection of the protection channel is maintained. 2. The method according to claim 1, characterized in that, when the working channel is good and the switching remains at the initial condition of the working channel, the third way is to further include in the step c1: Within the time T of the switch, if the switching controller does not receive the alarm disappearance message reported by the service receiving device, it means that the protection channel has also failed, and then performs a recovery operation to maintain the connection of the working channel again . 3. The method according to claim 1, wherein, when both the working channel and the protection channel fail, switching remains under the initial conditions of the working channel, and the first method includes: if the When the switching controller receives the alarm disappearance signal detected by the service signal detection point, it indicates that the status of the working channel is changed to good, and the connection of the working channel is continued. 4. The method according to claim 3, wherein, when both the working channel and the protection channel fail, switching remains under the initial conditions of the working channel, and the second method includes: Step a2, on the premise that the switching controller does not receive the alarm disappearance signal detected by the service signal detection point, if the switching controller receives the alarm disappearance message reported by the protection channel optical detection point, then Indicates that the status of the protection channel is changed to good; Step b2, the switching controller sends a command message to the selected single board to perform a protection switching operation, connects the receiving device through the protection channel, and starts a timer with a time length of T at the same time; Step c2, within the time T of the timer, if the switching controller receives the alarm disappearance message reported by the service receiving device, it means that the protection channel is good, and the connection of the protection channel is maintained. 5. The method according to claim 4, characterized in that, when both the working channel and the protection channel fail, switching remains under the initial condition of the working channel, and the third method is that in the step c2 further includes: within the time T of the timer, if the switching controller does not receive the alarm disappearance message reported by the service receiving device, it means that the protection channel is still faulty, and then perform a recovery operation to maintain all The connection of the working channel. 6. The method according to claim 1, characterized in that, when the working channel is faulty, the protection channel is good, and switching remains under the initial conditions of the protection channel, and the third method comprises: if the switching When the controller receives the alarm generation message reported by the optical detection point of the protection channel, the switching controller sends a command message to the selection board to perform a switching recovery operation, and restore the connection to the working channel. 7. The method according to claim 6, characterized in that, when the working channel is faulty, the protection channel is good, and the switching remains under the initial condition of the protection channel, and the first method includes: Step a3, on the premise that the switching controller does not receive the alarm generation message detected by the service signal detection point, if the switching controller receives the alarm disappearance message reported by the optical detection point of the working channel, then Indicates that the status of the working channel is changed to good; Step b3, the switching controller sends a command message to the selected single board to perform a protection recovery operation, connects the receiving device through the working channel, and starts a timer with a time length of T at the same time; Step c3: within the time T of the timer, if the switching controller receives the alarm disappearance message reported by the service receiving device, it confirms that the working channel is good, and keeps the connection of the working channel. 8. The method according to claim 7, characterized in that, when the working channel is faulty, the protection channel is good, and the switching remains under the initial condition of the protection channel, and the second mode is in the step c3 It further includes: within the time T of the timer, if the switching controller does not receive the alarm disappearance message reported by the service receiving equipment, the working channel is still faulty, and the switching controller controls the selection menu The board performs a switching operation, switching to the protection channel and maintaining the connection of the protection channel. 9. The method according to any one of claims 1, 2, 4, 5, 7 or 8, wherein the length of the time T is greater than or equal to the time required for the selected board to perform switching The sum of the maximum time and the maximum time required by the receiving device to detect and confirm that the alarm disappears.

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