CN101141218B - Protection switching system and method for wavelength division multiplexing load client network - Google Patents
Protection switching system and method for wavelength division multiplexing load client network Download PDFInfo
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Abstract
The utility model discloses a protection switching system and a method used for the wave division multiplex (WDM) loading client net. The system comprises the first protector which is used to bypass the signals inputted from the first client's equipment and sent respectively to the service channel and the protection channel; the service channel consists of M serial waveform division devices which are adopted to transfer the shunting signals to the second protector; the protection channel consists of M serial waveform division devices which are adopted to transfer the shunting signals to the second protector; the second protector is used to receive the signals from the service channel or the protection channel and the received signals can be delivered to the second client's equipment. The utility model introduces the WDM client interface interconnect protocol which effectively solve such problems as the protection switching when the different waveform division devices are interconnected as well as the thoroughly end joint of the client interface. The utility model has the advantages of simple technical solution, feasibility and cost-saving. Also, the stability and the interconnection of the network can be achieved via the utility model.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a protection switching system and method for a wavelength division multiplexing bearer client network.
Background
At present, in a communication network, wavelength division devices of different manufacturers are generally required to be interconnected through a client interface, but due to different methods for processing client services by the manufacturers under different conditions, the wavelength division devices of the manufacturers cannot be completely connected when the client interfaces are interconnected, so that partial functions cannot be realized, or even cannot be interconnected.
Fig. 1 shows a connection scheme of a wavelength division device and a client device. As shown in fig. 1, the wavelength division devices are interconnected with other wavelength division devices or client devices through a wavelength division OAC (Optical adaptation Channel) interface, and services accessed from the wavelength division OAC interface conform to a corresponding standard, such as SDH (Synchronous Digital Hierarchy) services conform to g.707 and the like, and GE (Gigabit Ethernet, 1000Mbps Ethernet protocol) conforms to IEEE802.3 standard. When the customer service signal is normal, the wavelength division OAC interface must completely transmit the service; when the customer service fails, the wave division OAC interface must process the service according to a certain standard to ensure the normal connection between the wave division equipments and the customer equipments, thereby ensuring the normal operation of the protection switching function of the wave division multiplexing bearing customer network.
There are many ways for the existing protection switching of the wdm-bearing client network, such as 1+1 protection. Generally, the functions of the 1+1 protection switching devices of each manufacturer are basically consistent, the client service received from the client device is divided into two parts by adopting a concurrent optimal receiving principle, and the two parts are transmitted in the working wavelength division device and the protection wavelength division device respectively, and the OAC receiving the working wavelength division device and the protection wavelength division device selects the optimal client service according to the client service state and sends the optimal client service state to the client device, wherein the switching criterion is input no light. The protection switching device has the advantages that protocol processing is not needed, and wavelength division equipment of multiple manufacturers can be conveniently interconnected. The protection switching device only detects input optical power and switches according to the optical power, and a user actually needs to take customer service failure as a protection switching condition. However, the wavelength division device is required to convert the client service failure into no light, so that the wavelength division device is matched with the protection switching device to realize the 1+1 protection switching function, and therefore, when the wavelength division device is interconnected, the consistency of the interconnection interface can be ensured, so that the transparent transmission of the client signal is ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a protection switching system and a method for a wavelength division multiplexing bearing client network, which can effectively solve the problem of network protection switching during interconnection.
To achieve the above object, according to an aspect of the present invention, a protection switching system for a wavelength division multiplexing bearer client network includes: the first protection device is used for dividing signals input from the first client equipment into paths and sending the divided signals to the working channel and the path protection channel; the working channel comprises M wave division devices connected in series and is used for transmitting signals to the second protection device; the protection channel comprises M wave division devices connected in series and is used for transmitting signals to the second protection device; and a second protection device for receiving a signal from the working channel or the protection channel and outputting the received signal to the second client apparatus. Wherein M is a positive integer. Wherein, the wavelength division equipment includes: the performance alarm detection module is used for detecting an input signal; and an APSD control module for determining whether to trigger the on and off of the output laser according to the APSD (automatic Protection Shut Down) enabling state and the detection result of the performance alarm detection module.
The first protection device is provided with a working channel sending working channel used for sending the branched signals to the working channel and a sending protection channel used for sending the branched signals to the protection channel.
Wherein the detection result comprises at least one of the following: the customer service is normal, which means that the OAC interface of the wavelength division equipment has no error code, or the number of error codes or error packets is lower than a preset threshold and is not in a customer service failure state or a customer maintenance signal state; the service performance of the client is degraded, which indicates that the number of the error codes or error packets detected by the interface of the wavelength division equipment is higher than a preset threshold and does not meet the condition of the service failure state of the client; customer service failure, which means that the OAC interface of the wavelength division equipment detects service interruption; and a customer maintenance signal indicating that customer service is currently in a particular state when the OAC interface of the wavelength division device detects the customer maintenance signal.
Under the condition that the detection result of the performance alarm detection module is that the client service is normal, the APSD control module carries out normal transmission on the input signal; and under the condition that the detection result of the performance alarm detection module is abnormal of the wavelength division equipment, the APSD control module carries out abnormal transmission on the input signal.
Continuing to transmit the signal with the output of the wavelength division device connected to another wavelength division device; and when the output of the wavelength division equipment is connected to the second protection switching device, the wavelength division equipment starts the APSD action and closes the OAC output laser under the condition that the APSD control module of the wavelength division equipment is enabled and the signal is in a customer service performance degradation state or a customer service failure state.
And under the condition that the second protection switching device detects that the current working channel has no light, switching the receiving to the protection channel and starting the optical layer protection switching.
According to another aspect of the present invention, a protection switching method for a wavelength division multiplexing bearer client network comprises the following steps: step S302, a first protection switching device divides a signal input from first client equipment into branches and outputs the branched signal to a working channel and a protection channel, wherein the working channel and the protection channel respectively comprise M pieces of wavelength division equipment, and M is a positive integer; step S304, when the output of the wavelength division device of the working channel is connected to the second protection switching device, the wavelength division device starts the APSD action and closes the OAC output laser under the condition that the APSD control module of the wavelength division device is enabled and the signal is in the state of the degraded performance of the customer service or the state of the failed customer service; and step S306, the second protection switching device switches reception to the protection channel when detecting that the current working channel is free of light, starts optical layer protection switching, and transmits the received signal to the second client device.
The detection result comprises at least one of the following: the client service normal state indicates that the OAC interface of the wavelength division equipment has no error code, or the number of error codes or error packets is lower than a preset threshold and is not in a client service failure state or a client maintenance signal state; the client service performance degradation state represents that the number of error codes or error packets detected by an interface of the wavelength division equipment is higher than a preset threshold and does not meet the condition of the client service failure state; the client service failure state indicates that the OAC interface of the wavelength division equipment detects service interruption; and a customer service signal state indicating that the OAC interface of the wavelength division equipment detects a customer service signal and that the customer service is currently in a special state.
In step S304, in the case where the output of the wavelength division device is connected to another wavelength division device, the signal continues to be transmitted; when the output of the wavelength division equipment is connected to the second protection switching device, the wavelength division equipment starts the APSD action and turns off the OAC output laser under the condition that the APSD control module of the wavelength division equipment is enabled and the signal is in a customer service performance degradation state or a customer service failure state.
The invention provides a protection switching system and a method for a wavelength division multiplexing bearing client network, which adopt a wavelength division multiplexing client interface interconnection protocol and can effectively solve the protection switching problem and the complete butt joint problem of client interfaces when wavelength division equipment of different manufacturers are interconnected. The technical scheme of the invention is simple and easy to realize, and can save the investment of users and improve the stability, the interconnectivity and the like of the network.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention, and in which:
fig. 1 is a diagram showing a connection structure of a wavelength division device and a client device in the related art;
fig. 2 shows a block diagram of the protection switching system for wdm-bearing customer networks according to the present invention;
fig. 3 shows a flow chart of the protection switching method for wavelength division multiplexing bearer client network of the present invention; and
fig. 4 shows a flowchart of a protection switching method for a wdm-bearing client network according to an embodiment of the present invention.
Detailed Description
The protection switching system and method for a wdm-bearing client network according to the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 2 shows a block diagram of the protection switching system for wavelength division multiplexing bearer client networks according to the present invention. As shown in fig. 2, the protection switching system for wavelength division multiplexing bearer client network of the present invention includes: a first protection device 204 for splitting and transmitting a signal inputted from the first client apparatus to the working channel and the protection channel; a working channel 206 comprising M wavelength division devices connected in series for transmitting signals to the second protection means; a protection channel 208 comprising M wavelength division devices connected in series for transmitting the divided signal to a second protection means; and a second protection device 210 for receiving a signal from the working channel or the protection channel and outputting the received signal to the second client apparatus. Wherein M is a positive integer.
The first protection device 204 has a transmission working channel 2042 for transmitting the split signal to the working channel and a transmission protection channel 2044 for transmitting the split signal to the protection channel.
Wherein, the wavelength division equipment includes: the APSD control module is used for determining whether to trigger the on and off of the output laser according to the APSD enabling state and the detection result of the performance alarm detection module. Wherein the detection result comprises at least one of the following: the customer service is normal, which means that the OAC interface of the wavelength division equipment has no error code, or the number of error codes/error packets is lower than a preset threshold and the OAC interface is not in a customer service failure state or a customer maintenance signal state; the service performance of the client is degraded, which indicates that the number of error codes/error packets detected by the interface of the wavelength division equipment is higher than a preset threshold and does not meet the condition of the service failure state of the client; customer service failure, which means that the OAC interface of the wavelength division equipment detects service interruption; and a customer maintenance signal indicating that customer service is currently in a particular state when the OAC interface of the wavelength division device detects the customer maintenance signal.
Under the condition that the detection result of the performance alarm detection module is that the wavelength division equipment is normal, the APSD control module carries out normal transmission on the input signal; and under the condition that the detection result of the performance alarm detection module is abnormal of the wavelength division equipment, the APSD control module carries out abnormal transmission on the input signal.
Continuing to transmit the signal with the output of the wavelength division device connected to another wavelength division device; when the output of the wavelength division equipment is connected to the second protection switching device, the wavelength division equipment starts the APSD action and turns off the OAC output laser under the condition that the APSD control module of the wavelength division equipment is enabled and the signal is in a customer service performance degradation state or a customer service failure state.
And under the condition that the second protection switching device detects that the current working channel has no light, switching the receiving to the protection channel and starting the optical layer protection switching.
Fig. 3 shows a flowchart of the protection switching method for a wavelength division multiplexing bearer client network according to the present invention, and as shown in fig. 3, the protection switching method for a wavelength division multiplexing bearer client network according to the present invention includes the following steps: step S302, a first protection switching device branches a signal input from first client equipment and outputs the branched signal to a working channel and a protection channel, wherein the working channel and the protection channel respectively comprise M pieces of wavelength division equipment, and M is a positive integer; step S304, when the output of the wavelength division device of the working channel is connected to the second protection switching device, the wavelength division device starts the APSD action and closes the OAC output laser under the condition that the APSD control module of the wavelength division device is enabled and the signal is in the state of the degraded performance of the customer service or the state of the failed customer service; and step S306, the second protection switching device switches reception to the protection channel when detecting that the current working channel is free of light, starts optical layer protection switching, and transmits the received signal to the second client device.
The detection result comprises at least one of the following: the client service normal state indicates that the OAC interface of the wavelength division equipment has no error code, or the number of error codes/error packets is lower than a preset threshold and is not in a client service failure state or a client maintenance signal state; the client service performance degradation state represents that the number of error codes/error packets detected by an interface of the wavelength division equipment is higher than a preset threshold and does not meet the condition of the client service failure state; the client service failure state indicates that the OAC interface of the wavelength division equipment detects service interruption; and a customer service signal state indicating that the OAC interface of the wavelength division equipment detects a customer service signal and that the customer service is currently in a special state.
In step S304, in the case where the output of the wavelength division device is connected to another wavelength division device, the signal continues to be transmitted; when the output of the wavelength division equipment is connected to the second protection switching device, the wavelength division equipment starts the APSD action and turns off the OAC output laser under the condition that the APSD control module of the wavelength division equipment is enabled and the signal is in a customer service performance degradation state or a customer service failure state.
The invention is further described below by taking only a unidirectional traffic signal flow as an example.
The invention adopts a concurrent preferential receiving strategy, and the client service is divided into a working channel and a protection channel and is respectively transmitted through different wavelength division devices. When the working channel is in a failure, a protection switching device (Optical protection board, abbreviated as OP board) is automatically switched to the protection channel, and the client device receives the service transmitted by the protection channel later. In the whole 1+1 protection switching system, interfaces between the wavelength division devices and the protection switching device need to be defined, so that the interfaces are matched to complete the protection switching work. The specific connection relationship of the system is shown in fig. 2.
The client signal sent by the first client device 202 is connected to the first protection switching device 204 through the client service interface 2022; the first protection switching device divides the input signal into two parts and respectively sends the two parts to the sending working channel 2042 and the sending protection channel 2044; the outputs of the transmission working channel and the transmission protection channel are respectively connected to the western OAC interfaces 2062-1 and 2082-1 inputs of the wavelength division device 2062 and the wavelength division device 2082; the input signals of the west OAC interfaces 2062-1 and 2082-1 of the wavelength division device 2062 and the wavelength division device 2082 are output from the east OAC interfaces 2062-2 and 2082-2 of the wavelength division device 2062 and the wavelength division device 2082, respectively, after being subjected to wavelength division transmission. Meanwhile, the performance alarm detection modules 2062-3 and 2082-3 of the wavelength division device 2062 and the wavelength division device 2082 detect the input signals, and the APSD control modules 2062-4 and 2082-4 determine whether to trigger the on and off of the output lasers of the east OAC interfaces 2062-2 and 2082-2 of the wavelength division device 2062 and the wavelength division device 2082 according to the APSD enabling state and the instruction of the performance alarm detection module; the outputs of the east OAC interfaces 2062-2 and 2082-2 of the wavelength division device 2062 and the wavelength division device 2082 are connected with the inputs of the west OAC interfaces 2064-1 and 2084-1 of the lower wavelength division device; input signals of the west-oriented OAC interfaces 2064-1 and 2084-1 of the lower-level wavelength division equipment are output from the east-oriented OAC interfaces 2064-2 and 2084-2 of the lower-level wavelength division equipment respectively after being subjected to wavelength division transmission. Meanwhile, the performance alarm detection modules 2064-3 and 2084-3 of the wavelength division device 2064 and the wavelength division device 2084 detect input signals, and the APSD control modules 2064-4 and 2084-4 determine whether to trigger the on and off of the output lasers of the east OAC interfaces 2064-2 and 2084-2 of the lower wavelength division device according to the APSD enabling state and the instruction of the performance alarm detection module; the outputs of the east OAC interface of the lower wavelength division device are connected to the receive working channel 2102 and the receive protection channel 2104 of the second protection inversion device 210, respectively.
The following three types of 1+1 switching situations when the client device is applied are specifically described with reference to fig. 2 and fig. 4.
When the client device is an SDH device, the specific flow is as follows:
in the first step, a customer signal is input from the wavelength division OAC interface of the first switching protection device (S402). The wavelength division device 2062 detects a Client SDH Signal input to the OAC interface 2062-1, and classifies the Client SDH Signal into four categories, namely, CSD (Client Signal degradation), CSF (Client Signal Fail), CMS (Client Maintenance Signal), and COK (Client OK, normal Client service), according to the detection result, the Signal is considered to be COK when the error code of the SDH Signal B1 is smaller than the error code threshold and is not in the CSF and CMS states, the Signal is considered to be CSD when the error code of the SDH Signal B1 is greater than the error code threshold and is not in the CSF, the Signal is considered to be CSD when the SDH Signal is in LOS (LOSs of Signal) or LOF (LOSs of frame), and the Signal is considered to be CMS (multiplexed simple Indication Signal) when the SDH Signal is in the MS-AIS (MS-simple Indication Signal), and the Signal is considered to be CMS (404).
And secondly, transmitting the client signal. Before transmission, it is first determined whether the wavelength division device is normal or abnormal (S406).
When the wavelength division device 2062 is normal, the client signal is normally transmitted, and the result of detecting the client signal in the first step is not changed, and what the client signal input by the OAC is and what the client signal output by the OAC is. When the SDH signal input to the westward OAC interface 2062-1 is normal, the SDH signal output from the eastern OAC interface 2062-2 is also normal at this time; when the SDH signal input by the west-oriented OAC interface is B1 error code over-limit, the SDH signal output by the east-oriented OAC interface is B1 error code over-limit; when the SDH signal input by the west-oriented OAC interface is B2 error code over-limit, the SDH signal output by the east-oriented OAC interface is B2 error code over-limit; when the SDH signal input by the west-oriented OAC interface is LOS, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input by the west-oriented OAC interface is LOF, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input to the west OAC interface is MS-AIS, the SDH signal output to the east OAC interface at this time is MS-AIS (S408).
When the wavelength division device 2062 is abnormal, the client signal is abnormally transmitted, and the abnormal wavelength division device means that the wavelength division device itself has a fault or the line optical fiber has a fault, and can cause the state change of the client service in a normal state (S410).
When the customer service is normal and error-free, if the wavelength division equipment exception causes the customer service output from the output port of the OAC to become a CSD state, the exception is defined as a general exception: that is, when the SDH signal input to the westward OAC interface 2062-1 is normal, the SDH signal output to the eastern OAC interface 2062-2 is B1 error over-limit or B2 error over-limit at this time; when the SDH signal input by the west-oriented OAC interface is B1 error code over-limit or B2 error code over-limit, the SDH signal output by the east-oriented OAC interface is B1 error code over-limit or B2 error code over-limit or LOS, LOF; when the SDH signal input by the west-oriented OAC interface is LOS, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input by the west-oriented OAC interface is LOF, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input by the west-oriented OAC interface is MS-AIS, the SDH signal output by the east-oriented OAC interface is B1 error code over limit and MS-AIS.
If the wavelength division equipment abnormality causes the customer traffic output by the OAC output port to become CSF, the abnormality is defined as a serious abnormality: that is, when the SDH signal input to the westward OAC interface 2062-1 is normal, the SDH signal output from the eastern OAC interface 2062-2 is LOS or LOF at this time; when the SDH signal input by the west-oriented OAC interface is B1 error code over-limit or B2 error code over-limit, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input by the west-oriented OAC interface is LOS, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input by the west-oriented OAC interface is LOF, the SDH signal output by the east-oriented OAC interface is LOS or LOF; when the SDH signal input to the west-oriented OAC interface is MS-AIS, the SDH signal output to the east-oriented OAC interface is LOS or LOF.
Third, it is determined whether the output of the east OAC interface 2062-2 of the wavelength division device is connected to the second protection switching device (S312), because the east OAC interface is connected to the input of the west OAC interface 2064-1 of the wavelength division device 2064, and is not connected to the second protection switching device, the SDH signal of the client is continuously transmitted, and the wavelength division device 2064 continuously transmits the SDH signal input to the west OAC interface 2064-1, at this time, the processing method is the same as the first step and the second step. The customer signal is output from the east OAC interface 2064-2 after the transmission is completed. It is determined again whether the wavelength division device 2064 is connected to the second protection switching device, and at this time, the second protection device is connected to the east OAC interface 2064-2, so that the next step of processing is performed.
Step four, judging whether the APSD of the wavelength division device 2064 is enabled, if not, ending the process; if so, the fifth step is continued (S416).
Fifthly, judging whether the SDH signal of the output client of the east OAC interface 2064-2 is in the LOS, LOF or B1 error code over-limit state, if not, ending; if so, the sixth step is continued (S418).
Sixthly, the wavelength division device 2064 starts an APSD operation and turns off the output laser of the east OAC interface 2064-2 (S420).
Seventhly, the second protection switching device detects that the working channel input is not light, at this time, the receiving is switched to the protection channel, optical layer protection switching is started, and the second protection switching device selects the signal of the receiving protection channel to output to the client service interface of the second client device, so that the whole switching process is completed (S422).
When the client device is a data device, for convenience of description, GE/10GE LAN/FC/ESCON/FICON/DVB client signals are collectively referred to as data signals, and the specific flow is as follows:
in the first step, a customer signal is input from the wavelength division OAC interface of the first switching protection device. The wavelength division device 2062 detects the customer data signal input to the westward OAC interface 2062-1, and classifies it into four categories, CSD, CSF, CMS, and COK, according to the detection result. When the number of data signal receiving error packets is less than a threshold (MAC layer, namely, a media access control layer) and the number of PCS coding violations (PCS layer, namely, a physical coding sublayer)) is less than the threshold and is not in a CSF or CMS state, the signal is considered to be COK at the moment, when the number of data signal receiving error packets is over-limit or the number of PCS coding violations is over-limit, the signal is considered to be CSD at the moment, and when the data signal is in a synchronization LOSs alarm (PCS layer) or LOS, the signal is considered to be CSF at the moment and the data signal is not in a CMS state.
And secondly, transmitting the client signal. Before transmission, it is first determined whether the wavelength division device is normal or abnormal (S406).
When the wavelength division device 2062 is normal, the client signal is normally transmitted, and the result of detecting the client signal in the first step is not changed, and what the client signal input by the OAC is and what the client signal output by the OAC is. When the data signal input to the western OAC interface 2062-1 is normal, the data signal output from the east OAC interface 2062-2 is also normal; when the data signal input by the west-oriented OAC interface is that the number of received error packets is over-limit, the data signal output by the east-oriented OAC interface is that the number of received error packets is over-limit or the number of PCS coding violations is over-limit; when the data signal input by the west-oriented OAC interface is that the number of the PCS coding violations is over-limit, the data signal output by the east-oriented OAC interface is that the number of the PCS coding violations is over-limit; when the data signal input by the west-oriented OAC interface is LOS, the data signal output by the east-oriented OAC interface is LOS or synchronization LOSs; when the data signal input to the westward OAC interface is synchronous LOSs, the data signal output to the eastern OAC interface is LOS or synchronous LOSs.
When the wavelength division device 2062 is abnormal, the client signal is abnormally transmitted, and the abnormal wavelength division device means that the wavelength division device itself has a fault or the line optical fiber has a fault, and can cause the state change of the client service in a normal state.
When the customer service is normal and error-free, if the wavelength division equipment exception causes the customer service output from the output port of the OAC to become a CSD state, the exception is defined as a general exception: that is, when the data signal input to the western OAC interface 2062-1 is normal, the data signal output from the east OAC interface 2062-2 is the reception error packet number over-limit or the PCS coding violation number over-limit; when the data signal input by the west-oriented OAC interface is that the number of received error packets is over-limit, the data signal output by the east-oriented OAC interface is that the number of received error packets is over-limit or the number of PCS coding violations is over-limit; when the data signal input by the west-oriented OAC interface is LOS, the data signal output by the east-oriented OAC interface is LOS or synchronization LOSs; when the data signal input to the westward OAC interface is synchronous LOSs, the data signal output to the eastern OAC interface is LOS or synchronous LOSs.
If the wavelength division equipment abnormality causes the customer traffic output by the OAC output port to become CSF, the abnormality is defined as a serious abnormality: that is, when the data signal input to the OAC interface 2062-1 in the west direction is normal, the data signal output to the OAC interface 2062-2 in the east direction is LOS or synchronization LOSs; when the data signal input by the west-oriented OAC interface is over-limit of the number of received error packets or over-limit of the number of violation of PCS coding, the data signal output by the east-oriented OAC interface is LOS or synchronization LOSs; when the data signal input by the west-oriented OAC interface is LOS, the data signal output by the east-oriented OAC interface is LOS or synchronization LOSs; when the data signal input to the westward OAC interface is synchronous LOSs, the data signal output to the eastern OAC interface is LOS or synchronous LOSs.
Third, it is determined whether the output of the east OAC interface 2062-2 of the wavelength division device 2062 is connected to the protection switching device. At this time, the east OAC interface is connected to the input of the west OAC interface 2064-1 of the wavelength division device 2064, and is not connected to the second protection switching device, so that the client data signal continues to be transmitted, and the wavelength division device 2064 continues to transmit the data signal input to the west OAC interface 2064-1, and at this time, the processing method is the same as the first step and the second step. The customer signal is output from the east OAC interface 2064-2 after the transmission is completed. And it is determined again whether the east OAC interface 2064-2 is connected to the second protection switching device, which is the second protection switching device, so that the next step of processing is performed.
Step four, judging whether the APSD of the wavelength division device 2064 is enabled, if not, ending the process; if so, continuing the fifth step.
Fifthly, judging whether the client data signal output by the east OAC interface 2064-2 is in the states of synchronous LOSs LOS, over-limit number of received error packets and over-limit number of PCS coding violations, and ending if not; if yes, the sixth step is continued.
Sixthly, the wavelength division device 2064 starts an APSD operation and turns off the output laser of the east OAC interface 2064-2 (S420).
And seventhly, the second protection switching device detects that the working channel input is not light, at the moment, the receiving is switched to the protection channel, the optical layer protection switching is started, and the second protection switching device selects the signal of the receiving protection channel to output to a client service interface of the second client device.
When the client device is an OTN (Optical Transport Network) device, the specific flow is as follows:
in the first step, a customer signal is input from the wavelength division OAC interface of the first switching protection device. The wavelength division device 2062 detects a client OTUk (complete standard Optical Channel Transport Unit-k) signal input from the western OAC interface 2062-1, and classifies the signal into four types of signals according to a detection result: CSD, CSF, CMS, COK. When the OTUk Signal SM-BIP8(section monitoring-Bit Interleaved Parity8, segment monitoring-8 Bit Interleaved cross-check) is less than the threshold and is not in the CSF and CMS states, the Signal is considered to be a COK at this time, when the OTUk Signal SM-BIP8 is over-limited, the Signal is considered to be a CSD at this time, when the OTUk Signal is OTUk LOF, LOS, the Signal is considered to be a CSF at this time, when the OTUk Signal is in OTU-AIS (Optical Channel Transport Unit-Alarm Indication Signal), ODU-AIS (Optical Channel Data Unit-Alarm Indication Signal), ODU-LCK (Optical Channel Data-Locked, Optical Channel Data Unit-Locked), ODU-Open-OCI (Optical Channel-Alarm Indication Signal), Optical Channel Data connection is disconnected, the signal is considered to be CMS at this time.
And secondly, transmitting the client signal. Before transmission, it is first determined whether the wavelength division device is in a normal state or an abnormal state.
When the wavelength division device 2062 is normal, the client signal is normally transmitted, and the result of detecting the client signal in the first step is not changed, and what the client signal input by the OAC is and what the client signal output by the OAC is. When the OTUk signal input to the westward OAC interface 2062-1 is normal, the OTUk signal output to the eastern OAC interface 2062-2 is also normal at this time; when the OTUk signal input by the OAC interface in the west direction is SM-BIP8 over-limit or PM-BIP8(Path Monitoring-Bit Interleaved Parity8, channel Monitoring-8 Bit Interleaved cross-check) over-limit, the OTUk signal output by the OAC interface in the east direction is SM-BIP8 over-limit or PM-BIP8 over-limit; when the OTUk signal input to the OAC interface in the west direction is LOS, the OTUk signal output to the OAC interface in the east direction is LOS or OTUk LOF; when the OTUk signal input to the OAC interface in the west direction is OTUk LOF, the OTUk signal output to the OAC interface in the east direction is LOS or OTUk LOF; when the OTUk signals input to the Western-oriented OAC interface are OTU-AIS, ODU-LCK and ODU-OCI, the OTUk signals output to the east-oriented OAC interface are also OTU-AIS, ODU-LCK and ODU-OCI.
When the wavelength division device 2062 is abnormal, the client signal is abnormally transmitted, and the abnormal wavelength division device means that the wavelength division device itself has a fault or the line optical fiber has a fault, and can cause the state change of the client service in a normal state.
When the customer service is normal and error-free, if the wavelength division equipment exception causes the customer service output from the output port of the OAC to become a CSD state, the exception is defined as a general exception: that is, when the OTUk signal input to the western OAC interface 2062-1 is normal, the OTUk signal output to the eastern OAC interface is PM-BIP8 over-limit or SM-BIP8 over-limit at this time; when the OTUk signal input by the west-oriented OAC interface 2062-2 is SM-BIP8 over-limit or PM-BIP8 over-limit, the OTUk signal output by the east-oriented OAC interface is SM-BIP8 over-limit or PM-BIP8 over-limit or LOS or OTUk LOF; when the OTUk signal input to the OAC interface in the west direction is LOS, the OTUk signal output to the OAC interface in the east direction is LOS or OTUk LOF; when the OTUk signal input to the OAC interface in the west direction is OTUk LOF, the OTUk signal output to the OAC interface in the east direction is LOS or OTUk LOF; when the OTUk signal input by the western OAC interface is ODU-AIS, the OTUk signal output by the east OAC interface is ODU-AIS and SM-BIP8 overrun; when the OTUk signal input by the western OAC interface is ODU-LCK, the OTUk signal output by the east OAC interface is ODU-LCK and SM-BIP8 overrun; when the OTUk signal input by the western OAC interface is ODU-OCI, the OTUk signal output by the east OAC interface is ODU-OCI and SM-BIP8 overrun; when the OTUk signal input by the western-oriented OAC interface is OTU-AIS, the OTUk signal output by the east-oriented OAC interface is OTU-AIS or OTUk LOF.
If the wavelength division equipment abnormality causes the customer traffic output by the OAC output port to become CSF, the abnormality is defined as a serious abnormality: that is, when the OTUk signal input to the OAC interface 2062-1 in the west direction is normal, the OTUk signal output to the OAC interface 2062-2 in the east direction is LOS or OTUk LOF; when the OTUk signal input by the OAC interface in the west direction is SM-BIP8 over-limit or PM-BIP8 over-limit, the OTUk signal output by the OAC interface in the east direction is LOS or OTUk LOF; when the OTUk signal input to the OAC interface in the west direction is LOS, the OTUk signal output to the OAC interface in the east direction is LOS or OTUk LOF; when the OTUk signal input to the OAC interface in the west direction is OTUkLOF, the OTUk signal output to the OAC interface in the east direction is LOS or OTUkLOF; when the OTUk signal input to the western OAC interface is OTU-AIS, ODU-LCK and ODU-OCI, the OTUk signal output to the east OAC interface is LOS or OTUk LOF.
Third, it is determined whether the output of the wavelength division device 2062 to the OAC interface 2062-2 is connected to the second protection switching device, because the input of the westward OAC interface 2064-1 of the wavelength division device 2064 is connected at this time, and the output is not connected to the second protection switching device, the OTUk signal of the client continues to be transmitted, and the OTUk signal input to the westward OAC interface 2064-1 continues to be transmitted by the wavelength division device 2064, at this time, the processing method is the same as the first step and the second step. The customer signal is output from the east OAC interface 2064-2 after the transmission is completed. And judging whether the protection switching device is connected with the second protection switching device again, wherein the second protection device is connected at the moment, so that the next step of processing is carried out.
Step four, judging whether the APSD of the wavelength division device 2064 is enabled, if not, ending the process; if so, continuing the fifth step.
Fifthly, judging whether the OTUk signal of the output client of the east OAC interface 2064-2 is in the error code over-limit state of LOS, LOF and SM-BIP8, and ending if not; if yes, the sixth step is continued.
Sixthly, the wavelength division device 2064 starts the APSD operation and turns off the output laser of the OAC interface.
And seventhly, the second protection switching device detects that the working channel input is dark, at this time, the receiving is switched to the protection channel, the optical layer protection switching is started, and the protection switching device selects and receives the signal of the protection channel and outputs the signal to the client service interface of the second client device.
In addition, when other schemes are adopted for protecting the optical layer, such as 1:1, 1: N, etc., the procedures are also as described above.
Additional advantages and modifications will readily appear to those skilled in the art. Thus, the foregoing description of the embodiments is that of specific applications of the invention, and the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the invention as defined by the claims and their equivalents.
Claims (8)
1. A protection switching system for a wavelength division multiplexing bearer client network, comprising:
the first protection device is used for branching a signal input from the first client equipment and respectively sending the branched signal to the working channel and the protection channel;
the working channel comprises M pieces of wavelength division equipment connected in series and is used for transmitting the signal to a second protection device, wherein M is a positive integer;
the protection channel comprises M pieces of wavelength division equipment connected in series respectively and is used for transmitting the shunt signals to the second protection device, wherein M is a positive integer; and
the second protection device is used for receiving the signal from the working channel or the protection channel and outputting the received signal to second client equipment; wherein,
the wavelength division device includes: the performance alarm detection module is used for detecting an input signal; the automatic light path protection shutoff APSD control module is used for determining whether to trigger the on and off of the output laser according to the APSD enabling state and the detection result of the performance alarm detection module;
the method comprises the following steps of taking customer service failure as a protection switching condition, converting the customer service failure into no light, and realizing a protection switching function;
when the output of the wavelength division equipment is connected to the second protection device, the wavelength division equipment starts an APSD action and closes an optical adaptive channel OAC output laser under the condition that an APSD control module of the wavelength division equipment is enabled and the signal is in a customer service performance degradation state or a customer service failure state; and under the condition that the second protection device detects that the current working channel has no light, switching the receiving to a protection channel, and starting optical layer protection switching.
2. The protection switching system according to claim 1, wherein the first protection device has:
the sending working channel is used for sending the branched signals to the working channel; and
and the sending protection channel is used for sending the branched signals to the protection channel.
3. The protection switching system according to claim 1, wherein the detection result includes at least one of:
the customer service is normal, which means that the OAC interface of the optical adaptive channel of the wavelength division equipment has no error code, or the number of the error codes or error packets is lower than a preset threshold and is not in a customer service failure state or a customer maintenance signal state;
the service performance of the client is degraded, which indicates that the number of the error codes or error packets detected by the interface of the wavelength division equipment is higher than the preset threshold and does not meet the condition of the service failure state of the client;
the customer service failure indicates that the OAC interface of the wavelength division equipment detects service interruption; and
and customer maintenance signals, which indicate that the OAC interface of the wavelength division equipment detects the customer maintenance signals, and the customer service is in a special state currently.
4. The protection switching system according to claim 3, wherein:
under the condition that the detection result of the performance alarm detection module is that the customer service is normal, the APSD control module carries out normal transmission on the input signal; and
and under the condition that the detection result of the performance alarm detection module is that the wavelength division equipment is abnormal, the APSD control module carries out abnormal transmission on the input signal.
5. The protection switching system according to claim 4, wherein:
continuing to transmit the signal in the event that the output of the wavelength division device is connected to another wavelength division device.
6. A protection switching method using the protection switching system of any one of claims 1 to 5, characterized by comprising:
step S302, a first protection switching device branches a path of signals input from first client equipment, and outputs the branched signals to a working channel and a protection channel respectively, wherein the working channel and the protection channel both comprise M pieces of wavelength division equipment, and M is a positive integer;
step S304, when the output of the wavelength division device of the working channel is connected to a second protection device, the wavelength division device starts APSD action and closes the OAC output laser under the condition that the APSD control module of the wavelength division device is enabled and the signal is in a customer service performance degradation state or a customer service failure state; and
step S306, the second protection device switches reception to the protection channel when detecting that the current working channel is dark, starts optical layer protection switching, and transmits the received signal to the second client device.
7. The protection switching method according to claim 6, wherein the signal is detected when the wavelength division device transmits the signal, and the detection result includes at least one of:
the client service normal state indicates that the OAC interface of the wavelength division equipment has no error code, or the number of error codes or error packets is lower than a preset threshold and is not in a client service failure state or a client maintenance signal state;
a customer service performance degradation state, which represents that the number of detected error codes or error packets of the interface of the wavelength division equipment is higher than the preset threshold and does not conform to the condition of the customer service failure state;
a customer service failure state indicating that the OAC interface of the wavelength division equipment detects service interruption; and
a customer service signal state indicating that customer service is currently in a special state when the OAC interface of the wavelength division device detects a customer service signal.
8. The protection switching method according to claim 7, wherein in the step S304:
continuing to transmit the signal if the output of the wavelength division device is connected to another wavelength division device; and
when the output of the wavelength division device is connected to the second protection device, the wavelength division device starts an APSD action and turns off the OAC output laser when the APSD control module of the wavelength division device is enabled and the signal is in a customer service performance degradation state or a customer service failure state.
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| CN102761794B (en) * | 2012-07-09 | 2018-06-01 | 中兴通讯股份有限公司 | Photosphere passage 1+1 protection service establishing method and device |
| JPWO2017134813A1 (en) * | 2016-02-05 | 2018-08-30 | 三菱電機株式会社 | Signal light break detection device, optical amplifier, optical wavelength division multiplexing transmission device, and optical wavelength division multiplexing transmission system |
| CN115021803A (en) * | 2022-06-02 | 2022-09-06 | 中国电信股份有限公司 | Optical channel protection method, device and system |
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| CN1731228A (en) * | 2005-06-07 | 2006-02-08 | 烽火通信科技股份有限公司 | Line protector for four-fiber bidirectional optical amplification section of WDM optical transmission system |
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| CN1731228A (en) * | 2005-06-07 | 2006-02-08 | 烽火通信科技股份有限公司 | Line protector for four-fiber bidirectional optical amplification section of WDM optical transmission system |
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