KR100329106B1 - Optical Multiple Section Hierarchy, Surveillance Channel Overhead, and How It Works in Wavelength Division Multiple Systems - Google Patents

Abstract

The present invention relates to a supervisory channel overhead generated in an optical multiplex section (OMS) layer in a multi-channel wavelength division multiplexing (WDM) optical transmission system and a method of operating the same.

The monitoring channel overhead includes a frame byte, an optical signal alarm detection byte in which abnormality information of the main optical signal is recorded, and a monitoring channel alarm detection byte in which abnormality information of the monitoring channel overhead is recorded, and whether the optical channel is mounted. Monitoring byte for the optical channel with the recording control signal, status information monitoring byte for recording the fault type information, interval tracking byte for recording the channel path of the signal, and optical channel failure monitoring byte for the mounting and closing information of the optical channel. And BIP bytes in which parity information of the monitoring channel overhead is recorded.

Description

Optical Multisection Layer, Surveillance Channel Overhead, and Its Operation Method in WDM

The present invention relates to an optical multiplex section (OMS) layer in a multi-channel wavelength division multiplexing (WDM) optical transmission system, and in particular to monitor and control a WDM optical transmission system. The present invention relates to a monitoring channel overhead generated in an optical multi-section layer and a method of operating the same.

In general, the optical multiple section of a wavelength division multiplex optical transmission system (hereinafter referred to as WDM system) monitors the state of the optical multiple layer. In the optical multi-section layer, a monitoring channel overhead for monitoring and controlling the optical multi-section of the WDM system is generated and transmitted together with the multiplexed main optical signals.

This conventional supervisory channel overhead provides maintenance supervision, data communication channel functionality, and orderwire functionality. Here, the maintenance monitoring function includes a loss of optical signal (LOS), a loss of optical supervisory signal (LOS_SV), a loss of optical frame (LOF), and the like detected from the main optical signal and the monitoring channel overhead in a single station type WDM system. This function informs the opposite station of the fault detection fact in the reverse direction (US Patent No. 5500756). The data communication channel function is a function required for exchanging maintenance information between systems and data necessary for network management, and the other short circuit function is a function for allocating a voice transmission channel within a monitoring channel for voice communication between system operators.

However, the above-described conventional technology can effectively perform the monitoring control function because when one fault condition occurs in the system, the alarm is continuously generated in the upper layer, the lower layer and the counterpart system, and it is impossible to know exactly where the fault occurred. There was no problem.

Accordingly, the present invention has been made to solve the above problems of the prior art, the maintenance monitoring function, the channel connection status monitoring function, the channel capacity monitoring function, the data communication channel of the own country and the counterpart country. Provides supervisory channel overhead and its operation method that accommodates all functions and other short-circuit functions in the monitoring channel overhead so that the operation and maintenance of single station WDM system can be effectively performed. Its purpose is to.

1 is a configuration diagram of a WDM system to which the present invention is applied;

2 is a detailed configuration diagram of an optical multi-segment (OMS) layer of the WDM system shown in FIG.

3 is a detailed configuration diagram of a monitoring channel overhead analyzer shown in FIG. 2;

4 is a detailed configuration diagram of a monitoring channel overhead generation unit shown in FIG. 2;

5 is a supervisory channel overhead structure diagram of the optical multi-zone shown in FIGS. 3 and 4;

6 is an application example illustrating a method of operating a monitoring channel overhead when failure 1 occurs in a single station WDM system according to the present invention;

7 is an application example illustrating a method of operating a monitoring channel overhead when failures 2 and 3 occur in a single station WDM system according to the present invention;

8 is an application example showing a method of operating a monitoring channel overhead when failure 4 occurs in a single station type WDM system according to the present invention;

9 is an application example of the BIP byte and the interval tracking byte in a single station WDM system according to the present invention;

FIG. 10 is an exemplary application diagram of an optical channel number recognition byte, a data communication channel byte, and a rudder line byte in a single station type WDM system according to the present invention.

※ Explanation of code about main part of drawing ※

1: Terminal WDM System

2: Repeater WDM System

11: Optical Transport Section (OTS) Layer

12: Optical Multiplex Section (OMS) layer

13: Optical Channel Headend (OCH) Layer

21: optical transmission section (OTS) layer

31: Optical Mux

32: WDM Coupler

33: E / O (Electric to Optic) Converter

34: monitoring channel overhead generation unit

35: optical multi-section control unit

36: monitoring channel overhead analysis unit

37: O / E (Optic to Electric) conversion unit

38: Optical Demux

101: Reframing & Demux

102, 202: Optical signal alarm detection register

103, 203: Supervisory register with supervisory control signal for optical channel

104, 204: Status information monitoring register

105, 205: interval tracking register

106, 206: Fiber Channel Mount Monitoring Monitor

107, 207: Fiber Channel Number Register

108, 208: monitoring channel alarm detection register

109, 209: BIP register

110: data communication channel receiver

111: rudder wire receiver

201: Framing & Mux

210: data communication channel receiver

211: rudder wire receiver

Optical multi-section of a multi-channel wavelength division multiple optical transmission system comprising an optical channel section (OCH) layer, an optical multi-section (OMS) layer, and an optical transmission section (OTS) layer according to the present invention for achieving the above object. Hierarchy,

An optical multiplexing unit, an optical multiplexing unit multiplexing a multi-channel optical signal input from the optical channel section layer under the control of the optical multi-section control unit, and generating a monitoring channel overhead under the control of the optical multi-section control unit A supervisory channel overhead generation unit, a first WDM coupler for combining the supervisory channel overhead multiplexed by the optical multiplexer and the supervisory channel overhead to the optical transmission section layer, and a main optical signal input from the optical transmission section layer; A second WDM coupler for separating a monitoring channel overhead, an optical demultiplexer for transmitting a main optical signal separated from the second WDM coupler to the optical channel section layer under the control of the optical multi-section controller, and the second WDM coupler Surveillance channel overhead analysis unit for analyzing the separated surveillance channel overhead provided to the optical multi-section control unit It characterized by including.

In addition, in order to monitor and control a multi-channel Wavelength Division Multiplex (WDM) optical transmission system according to the present invention, a monitoring channel overhead generated in an optical multiplex section (OMS) layer is

Optical signal alarm detection byte in which frame byte, main optical signal abnormality information is recorded, monitoring channel alarm detection byte in which abnormality information of monitoring channel overhead is recorded, and optical channel monitoring in which optical channel mounting information is recorded The monitoring byte with control signal, the status information monitoring byte in which the fault type information is recorded, the interval tracking byte in which the channel path of the signal is recorded, the optical channel failure monitoring byte in which the optical channel mounting information is recorded, and the monitoring channel overhead. And a BIP byte in which parity information is recorded.

In addition, according to the present invention, in the event of a failure in a communication line between two WDM systems each consisting of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, a monitoring channel overhead operating method in a receiving station WDM system silver,

Detecting, by the receiving station WDM system, a failure occurring in the communication line by detecting a loss of optical signal of the received main optical signal;

If a failure is detected in the failure detection step, the optical WID system of the receiving station inserts a reverse abnormality detection signal into the optical signal alarm detection byte of the monitoring channel overhead transmitted back to the transmitting station WDM system, thereby transmitting the WDM WDM system. Informing the system of the failure detection,

If a failure is detected in the failure detection step, the optical transmission section layer of the receiving station WDM system includes a step of transmitting a forward abnormal detection signal (down FDI) to the optical multi-layer layer and the optical channel section layer lower layer; do.

Further, according to the present invention, in two WDM systems each consisting of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, an optical channel section layer and an optical multiplex of a transmitting station WDM system to transmit an optical signal In case of malfunction in the communication line between the section layers or the optical multiple section layer, the monitoring channel overhead operating method is

If the transmitting station WDM system detects the light intensity of the input or output side optical signal of the optical multi-section layer and the light intensity of the optical signal is significantly lowered, between the optical channel section layer and the optical multi-section layer of the transmitting station WDM system. Or detecting a failure occurring in the optical multi-section layer;

If a fault is detected in the fault detection step, the transmitting station WDM system inserts a forward abnormality detection signal into the optical signal alert detection byte of the monitoring channel overhead and inserts a kind of fault into the status information monitoring byte to indicate the fault occurrence fact. And notifying the receiving station WDM system.

In addition, in the two WDM systems, each of which consists of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, a monitoring channel failure of an optical multi-section layer of a transmitting station WDM system to transmit an optical signal is In the event of occurrence, the monitoring channel overhead operating method in the receiving station WDM system is

Detecting an optical intensity of a monitoring channel through which the optical multi-section layer of the receiving station WDM system is received, and detecting an occurrence of a monitoring channel failure of the optical multi-section layer of the transmitting station WDM system;

When the monitoring channel failure occurs, the receiving station WDM system inserts the reverse abnormality detection signal of the monitoring channel into the alarm detection byte of the monitoring channel overhead transmitted back to the transmitting station WDM system, and fails in the status information monitoring byte. And inserting a type into the transmission station to transmit to the transmitting station WDM system.

Also, according to the present invention, in two WDM systems, each of which consists of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, a transmission line abnormality between the WDM systems or a decrease in characteristics of a transmitting station WDM system is transmitted. When the optical signal includes a noise component, the monitoring channel overhead operating method in the receiving station WDM system,

Detecting, by the receiving station WDM system, whether or not the optical channel loss monitoring performance is deteriorated in the received optical signal, and detecting a BIP error by checking the parity of the received monitoring channel overhead;

And when the BIP error is detected, inserting a remote error detection signal into the monitoring channel alarm detection byte of the monitoring channel overhead transmitted back to the transmitting station WDM system to the transmitting station WDM system. It is characterized by.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a configuration diagram of a WDM system to which the present invention is applied, which comprises a single station type WDM system (1,1 ') and a repeater type WDM system (2). Through the repeater type WDM system 2, two end-type WDM systems 1 and 1 'are connected point-to-point. The single station type WDM system (1, 1 ') comprises an optical transmission section layer (11, 11'), an optical multisection section (12, 12 '), and an optical channel section layer (13, 13'). The repeater type WDM system 2 is composed of an optical transmission section layer 21, which is a 1 to R repeater.

Subordinate signals inputted to the optical channel section layers 13 and 13 'of one end-type WDM system 1, 1' are multiplexed in the optical multisection layer 12, 12 'and then the optical transmission section layer 11, 11 '). In addition, the multi-channel WDM optical signal received by the optical transmission layer layers 11 and 11 'is demultiplexed by the optical multi-layer layer 12 and 12' and then extracted as a dependent signal.

FIG. 2 is a detailed block diagram illustrating an optical multi-segment layer of the single station type WDM system shown in FIG. 1, which includes an optical multiplexer 31, a WDM coupler 32, and an E / O converter 33. ), The supervisory channel overhead generation unit 34, the optical multi-section control unit 35, the supervisory channel overhead analysis unit 36, the O / E conversion unit 37, and the optical demultiplexer (Optical Demux) 38 It is composed.

A single optical signal of a plurality of channels input from the optical channel section layer 13, which is an upper layer, is optically multiplexed by the optical multiplexer 31. The supervisory channel overhead generation unit 34 generates a supervisory channel overhead for supervising and controlling the optical multiple sections according to the command of the optical multiple section control unit 35, and the supervisory channel overhead is the E / O converter 33. Is converted into an optical signal. Thereafter, the main optical signal multiplexed by the optical multiplexer 31 and the supervisory channel overhead converted by the E / O converter 33 are combined by the WDM coupler 32 to provide a lower layer of the optical transmission interval layer 11. Is sent to.

Meanwhile, the main optical signal and the supervisory channel overhead received in the optical transmission section, which is the upper layer, are separated by the WDM coupler 38. The main optical signal is demultiplexed by the optical demultiplexer 39 and then transmitted to the optical channel section 13, which is a lower layer. The monitoring channel overhead is converted into an electrical signal by the O / E converter 37, the information is analyzed by the monitoring channel overhead analyzer 36, and then transmitted to the optical multi-section controller 35.

FIG. 3 is a detailed configuration diagram of the monitoring channel overhead analyzer shown in FIG. 2, which includes a reframing and demultiplexing unit 101, an optical signal alarm detection register 102, and an optical channel monitoring control signal monitoring register 103. ), Status information monitoring register 104, interval tracking register 105, optical channel failure monitoring register 106, optical channel number register 107, monitoring channel alarm detection register 108, BIP register 109, The data communication channel receiver 110 and the other short-circuit receiver 111 are configured.

The supervisory channel overhead is converted into an electrical signal by the O / E converter 37, and the supervisory channel overhead is separated for each byte by the refraction & demultiplexer 101. Each supervisory channel signal separated by byte is an optical signal alarm detection register 102, a supervisory register 103 with a supervisory control signal for the optical channel, a status information supervisory register 104, an interval tracking register 105, and an optical It is stored in the channel failure monitoring register 106, the optical channel number register 107, the monitoring channel alarm detection register 108, the BIP register 109, the data communication channel receiving unit 110, and the other short circuit receiving unit 111. .

4 is a detailed configuration diagram of the monitoring channel overhead generating unit shown in FIG. 2, which includes a framing and multiplexing unit 201, an optical signal alarm detection register 202, and an optical channel monitoring control signal monitoring register 203. , Status information monitoring register 204, interval tracking register 205, fiber channel lockout monitoring register 206, optical channel number register 207, monitoring channel alarm detection register 208, BIP register 209, data The communication channel receiver 210 and the other short-circuit receiver 211.

The optical multi-section control section 35 provides the monitoring channel overhead to be transmitted to each of the registers 202 to 211, byte by byte. The supervisory channel overhead stored in this register is multiplexed by the framing & multiplexing unit 201, and this multiplexed signal is converted into an optical signal by the E / O converter 33.

5 is a structural diagram of a monitoring channel overhead applied to FIGS. 3 and 4.

The monitoring channel overhead includes a frame byte, a supervision channel monitoring byte for optical channel (SVOB), a bit interleaved parity byte (BIP byte), an optical signal alarm detection byte, and a state. Status Information Supervision Byte (SISB), Trail Trace Identifier Byte (TTIB), Optical Equip Byte (OCEB), Optical Channel Number Byte (OCNB) ), A monitoring channel alarm detection byte, a data communication channel byte (DCC), an orderwire byte (OWIB), and a reservation byte.

Here, the frame byte is a byte indicating the position of the frame. The monitoring byte for monitoring the optical channel monitoring signal SVOB is a byte for performing a function for monitoring whether the monitoring channel overhead for the optical channel is attached. In the optical multi-segment layer, optical signals input from all 16 optical channels are multiplexed, and the 16 optical channels are monitored for transmission and are transmitted to the counterpart station WDM system.

The optical signal alarm detection byte monitors whether the main optical signal is abnormal and displays a normal state, a forward abnormal detection signal (FDI), or a backward abnormal detection signal (BDI) and transmits it.

Status information monitoring byte is divided into fault status information and interval tracking error status information. Loss status information includes Loss of Optical Signal (LOS), Loss of Optical Supervisory Signal (LOS_SV), Forward Defect Indication (FDI), and Los of of Information such as an optical frame), a functional failure, and the like, and the interval tracking error status information indicates whether the channel of the current signal corresponds to a preset path so that the counterpart WDM system can recognize it.

The monitoring channel alarm detection byte is a byte that performs maintenance monitoring of the monitoring channel overhead. If an error occurs in the BIP byte value of the monitoring channel backward error detection signal (Backward Defect Indication of supervisory) or the calculated BIP byte value, the remote station detection status is displayed in the monitoring channel alarm detection byte. To send.

The interval tracking byte is a byte for performing the connectivity monitoring function. That is, the interval tracking byte displays the set pattern of the corresponding light path. The BIP byte is a byte for performing the signal quality monitoring function. That is, the BIP byte indicates a parity bit for detecting a noise component included in the monitoring channel overhead or performing error correction. The sending WDM system calculates and sends the BIP byte, and the receiving WDM system stores the BIP byte transmitted from the counterpart WDM system.

The optical channel number recognition byte is a byte for performing a channel capacity monitoring function. That is, the total number of optical channels multiplexed is recorded in the optical channel number recognition byte. The optical channel thread hernia monitoring byte is a byte for performing a function of recognizing a thread and a hernia for each optical channel. The data communication channel byte is a data communication channel function byte for processing data communication channel (DCC) data of 192 kbps. The other short-circuit byte is a voice channel byte allocated within the monitoring channel overhead for voice transmission.

The following description mainly focuses on the monitoring control function of the WDM system. The maintenance monitoring function of the own station and the counter station WDM system is realized by using the forward abnormality detection signal FDI, the reverse abnormality detection signal BDI, and the monitoring channel reversed abnormality detection signal BDI_SV. If a failure is detected, the failure type is recorded in the status information monitoring byte and transmitted.

Here, the forward abnormality detection signal FDI is a signal for transmitting this to the receiving station when a malfunction occurs in the transmitting station. When the forward abnormality detection signal (FDI) is transmitted from the transmitting station, the receiving station transmits the forward abnormality detection signal to the lower layer of the optical channel section (down FDI), thereby suppressing an alarm that may occur in the optical channel section layer. In a receiving station WDM system, when the forward abnormality detection signal is transmitted from the optical transmission section layer to the optical multisection (down FDI), the optical multisection layer suppresses the alarm generated from itself. The backward error detection signal (BDI) is a signal for informing the receiving station of the occurrence of the failure to the counterpart WDM system when a failure occurs in the received main optical signal. The monitoring channel reverse error detection signal BDI_SV is a signal for the receiving station to inform the counterpart WDM system of the failure of the monitoring channel when a failure occurs in the monitoring channel overhead.

The signal quality monitoring function monitors the degradation of the monitoring channel. The connectivity monitoring function monitors whether the main optical signal output from the transmitting station is correctly transmitted to the desired receiving station. That is, the transmitting station and the receiving station use the same interval tracking bit pattern, and the receiving station monitors the bit pattern transmitted from the transmitting station to determine whether the channel path is correctly set.

The channel capacity monitoring function is a function installed in the transmitting station that reads the number of multiplexed optical channels. The data communication channel function and the short-circuit function are functions implemented by inserting data communication channel (DCC) data and voice data at a transmitting station and receiving them at the receiving station.

6 is an exemplary application diagram illustrating a method of operating a monitoring channel overhead when failure 1 such as optical cable disconnection of an optical transmission section layer (OTS) occurs in a single station type WDM system according to the present invention.

When a failure (disorder 1) occurs in the communication line between the transmitting station WDM system and the receiving station WDM system, the Loss of Optical Signal (LOS) of the main optical signal is detected in the receiving station WDM system. That is, when the LOS of the main optical signal is detected in the optical transmission section layer 11 'of the receiving station WDM system, the optical transmission section layer 11' is divided into the optical multisection layer 12 ', which is a lower layer, and the optical channel section. A forward abnormal detection signal (down FDI) is inserted into the layer 13 'and transmitted. This forward abnormality detection signal suppresses the alarm in the optical multi-segment layer 12 'and the optical channel section layer 13'.

On the other hand, the optical multi-segment layer 12 'of the receiving station WDM system inserts a reverse abnormality detection signal (BDI) into the optical signal alarm detection byte of the monitoring channel overhead returned to the transmitting station WDM system, and inserts it into the transmitting station WDM system. Inform the fault detection fact. In addition, the failure status information is inserted into the status information monitoring byte (SISB) and transmitted to the transmitting station WDM system together with the above-described failure detection chamber.

Here, the downlink error detection signal (down FDI) transmitted from the optical transmission section layer (11, 11 ') to the lower layer, the optical multisection layer (12, 12') and the optical channel section layer (13, 13 ') is monitored. It is not included in the channel overhead and is transmitted using a separate channel of the WDM system.

As described above, when failure 1 occurs between the transmitting station WDM system and the receiving station WDM system, the optical transmission section layer 11 'of the receiving station WDM system detects this failure and suppresses the alarm of the lower layer. In addition, this failure occurrence is recognized by the transmitting station WDM system as the other station, thereby performing an effective monitoring control function. In addition, this information is used to search for the location of the failure. The alarm status of the optical transmission section layer between the transmitting station WDM system and the receiving station WDM system detects an abnormality between transmission and reception as the BDI signal of the receiving station WDM system (OMS layer) is transmitted to the transmitting station WDM system. can do. To do this, OTS-LOS and downFDI are defined in the OTS layer and OMS-BDI is defined in the OMS layer to automatically detect the fault location. The network manager can analyze the fault location of the OST layer of the system through the OTS-LOS detection report of the receiving station and the OMS-BDI detection report of the transmitting station.

7 is an optical multiplexer due to an abnormal operation of an OMS layer device, such as an obstacle 2, such as an optical cable cut between the OCH layer and an OMS layer and a decrease in the OMS layer input light intensity due to a poor optical cable connection in a single station WDM system according to the present invention. An example of application showing a method of operating a monitoring channel overhead when a failure 3 such as an abnormal output of the same occurs.

In the transmitting station WDM system, a failure (disorder 2) occurs in the communication line between the optical multi-section layer 12 and the optical channel section layer 13, and the optical intensity of the optical multi-section input side is significantly reduced, or the optical multi-section When the light intensity of the output side of the optical multiple section is significantly lowered due to a malfunction in the layer 12 (disorder 3), the transmitting station WDM system inserts a forward abnormality detection signal (FDI) into the optical signal alert detection byte to correct the fault. Notify the receiving station WDM system.

The optical multiple section layer 12 'of the receiving station WDM system recognizes the forward abnormality detection signal, and then transmits a forward abnormality detection signal (down FDI) to the lower layer optical channel section layer 13'. As a result, the alarm in the optical channel section layer 13 'is suppressed. In addition, the optical multi-segment layer 12 'of the receiving station WDM system inserts a reverse abnormality detection signal (BDI) into the optical signal alarm detection byte to transmit an alarm recognition fact to the transmitting station WDM system, and sends a status information monitoring byte (SISB). Insert the fault type in the) and send it.

As described above, failure 2 occurs between the optical channel section layer 13 'and the optical multisection layer 12' of the transmitting station WDM system, thereby causing an input optical loss or a failure in the optical multisection layer 12 '. When 3 occurs and output light loss occurs, the transmitting station WDM system automatically notifies the receiving station WDM system of its own station detection fact and informs the recognized kind of failure through the status information monitoring byte (SISB). The receiving station WDM system suppresses the alarm even if the main optical signal is damaged and inputted by the failure of the transmitting station, and informs the transmitting station WDM system of the disabled. In this way, an effective monitoring control function is performed. Through this, the OMS layer's sender failure prevents the alarm from being propagated to the receiver's failure and the propagation of the failure as well as the fault location search function in the transmission network.

9 is an exemplary application diagram illustrating a method of operating a monitoring channel overhead when failure 4 occurs in a single station type WDM system according to the present invention.

If the monitoring channel optical intensity of the monitoring channel optical transmitter that is not the main data channel of the optical multi-section layer 12 of the transmitting station WDM system occurs and the monitoring channel light intensity drops significantly, the optical multi-section layer of the receiving station WDM system ( 12 ') detects a Loss of Optical Supervisory Signal (LOS_SV) and a Loss of Optical Supervisory Frame (LOF) signal of the Surveillance Channel. Through this, the optical multi-zone layer 12 'automatically inserts the backward error detection signal BDI_SV of the monitoring channel into the monitoring channel alarm detection byte and transmits it to the transmitting station WDM system, and the failure type of the status information monitoring byte (SISB). Insert to send. As such, the alarm location between the monitoring channel transmitter and the receiver of the optical multi-zone can be automatically detected. For this purpose, LOS-SV, LOF, and BDI-SV signals are defined.

As described above, when a failure occurs on the monitoring channel of the transmitting station WDM system, the receiving station detects it and transmits the reverse abnormality detection signal (BDI_SV) and the type of failure of the monitoring channel to the transmitting station WDM system in reverse. By notifying that an abnormality has occurred, an effective monitoring control function can be performed.

9 is a diagram illustrating an application of a BIP byte and an interval tracking byte in a single station type WDM system according to the present invention.

In the transmitting station WDM system, when the main optical signal is transmitted together with the monitoring channel optical signal, the monitoring channel data is BIP-processed and transmitted to the receiving station WDM system. The noise component is included due to a disturbance condition such as deterioration of the characteristics, and the receiving station WDM system detects the degradation of the optical channel in the main optical signal and detects the BIP error in the monitoring channel overhead. If a BIP error is detected, the receiving station WDM system inserts a remote error detection (REI) signal into the monitoring channel alarm detection byte and transmits it to the transmitting station WDM system.

In addition, if the path setting of the main optical signal transmitted from the transmitting station WDM system to the receiving station WDM system is incorrect, the section tracking mismatch is detected in the receiving station WDM system, and the receiving station WDM system transmits this fact to the transmitting station WDM system. . As described above, the receiving station WDM system can perform the effective fault monitoring function by detecting the performance degradation of the transmitting station, routing error, and the like, and transmitting the data back to the transmitting station.

11 is an exemplary application diagram of an optical channel number recognition byte, a data communication channel byte, and a rudder line byte in a single station type WDM system according to the present invention.

The transmitting station WDM system inserts the number of multiplexed optical channels into the optical channel number recognition byte, inserts data necessary for communication with the receiving station WDM system, into the data communication channel byte, and transmits data necessary for voice transmission with the receiving station WDM system. Inserts a short-circuit byte to send. The receiving station WDM system receives and uses this data.

Therefore, the receiving station WDM system can effectively manage maintenance information such as performance data according to the change in the number of multiplexed optical channels, and can perform DCC communication and other short-circuit communication.

As described above, according to the present invention, when a failure is detected in the optical signal and the monitoring channel overhead in the WDM system, the location of the failure can be accurately recognized by notifying the counterpart WDM system of the failure detection and suppressing the alarm of the lower layer. . In addition, when notifying the failure detection facts, the type of failure is transmitted together, so that necessary measures can be taken to overcome the failure, and an effective monitoring control function can be obtained.

Claims (16)

In the optical multi-section layer of a multi-channel wavelength division multiple optical transmission system consisting of an optical channel section (OCH) layer, an optical multi-section (OMS) layer, and an optical transmission section (OTS) layer, An optical multi-segment controller, An optical multiplexer which multiplexes a multi-channel optical signal input from the optical channel section layer under the control of the optical multi-section controller; Surveillance channel overhead generation unit for generating a surveillance channel overhead under the control of the optical multi-section control unit, A first WDM coupler which combines the main optical signal multiplexed by the optical multiplexer and the monitoring channel overhead and transmits it to the optical transmission interval layer; A second WDM coupler for separating a main optical signal and a monitoring channel overhead inputted from the optical transmission section layer; An optical demultiplexer for transmitting a main optical signal separated from the second WDM coupler to the optical channel section layer under the control of the optical multi-section controller; And a monitoring channel overhead analyzer for analyzing the monitoring channel overhead separated by the second WDM coupler and providing the monitoring channel overhead to the optical multi-section control unit. The E / O converter of claim 1, wherein the supervisory channel overhead generated by the supervisory channel overhead generator is converted into an optical signal and transmitted to the first WDM coupler, and the supervisory channel over separated from the second WDM coupler. An optical multi-division layer of a wavelength division multiplexing system further comprising an O / E converter for converting the head into an electrical signal and transmitting it to a monitoring channel overhead analyzer. The method according to claim 1 or 2, wherein the monitoring channel overhead generation unit, A plurality of registers for storing the monitoring channel overhead provided from the optical multi-section control unit for each byte according to its function, and the monitoring channel overhead for each byte stored in each register are multiplexed into a frame to provide the E / O conversion unit. An optical multisection layer of a wavelength division multiplexing system comprising framing & multiplexing. The method of claim 3, wherein the plurality of registers, Equipped with an optical signal alarm detection register for recording abnormal information of the main optical signal, a monitoring channel alarm detection register for recording abnormal information of the monitoring channel overhead, and a supervisory control signal for the optical channel for recording whether the optical channel is mounted or not. Monitoring register, status information monitoring register in which fault type information is recorded, interval tracking register in which signal channel path is recorded, optical channel failure monitoring register in which optical channel failure information is recorded, and parity of monitoring channel overhead ) Optical multisection layer of a wavelength division multiplex system characterized by including a BIP register in which information is recorded. The method of claim 1 or 2, wherein the monitoring channel overhead analysis unit, A reaming & demultiplexer for separating the monitoring channel overhead converted into an electrical signal by the O / E conversion unit by byte according to its function, and a plurality of registers for storing each signal separated by the byte. An optical multisection layer of a wavelength division multiplexing system. The method of claim 5, wherein the plurality of registers, Equipped with an optical signal alarm detection register for recording abnormal information of the main optical signal, a monitoring channel alarm detection register for recording abnormal information of the monitoring channel overhead, and a supervisory control signal for the optical channel for recording whether the optical channel is mounted or not. Monitoring register, status information monitoring register in which fault type information is recorded, interval tracking register in which signal channel path is recorded, optical channel failure monitoring register in which optical channel failure information is recorded, and parity of monitoring channel overhead ) An optical multisection layer of a wavelength division multiplexing system comprising a BIP register in which information is recorded. In the monitoring channel overhead generated by the Optical Multiplex Section (OMS) layer for monitoring and controlling a multi-channel Wavelength Division Multiplex (WDM) optical transmission system, Optical signal alarm detection byte in which frame byte, main optical signal abnormality information is recorded, monitoring channel alarm detection byte in which abnormality information of monitoring channel overhead is recorded, and optical channel monitoring in which optical channel mounting information is recorded The monitoring byte with control signal, the status information monitoring byte in which the fault type information is recorded, the interval tracking byte in which the channel path of the signal is recorded, the optical channel failure monitoring byte in which the optical channel mounting information is recorded, and the monitoring channel overhead. Surveillance channel overhead of a wavelength division multiplexing system comprising BIP bytes in which parity information is recorded. The method of claim 7, wherein the optical signal alarm detection byte, Wavelength division multiplexing comprising steady state information, a forward abnormality detection signal (FDI) that transmits a fault of its own station to the other station, and a reverse abnormality detection signal (BDI) which transmits a fault of the other station from the other station to the other station. Monitoring channel overhead of the system. The method of claim 7, wherein the status information monitoring byte, Monitoring channel overhead of a wavelength division multiplexing system comprising fault status information and interval tracking error status information generated in the own station or the counter station. The method of claim 7, wherein the monitoring channel alarm detection byte, Checking the parity of the monitoring channel transmitted from the other station, if an error is detected, the wavelength division multiplexing includes remote error detection (REI) information for transmitting it to the other station and monitoring channel error status information transmitted from the other station to the local station. Monitoring channel overhead of the system. In the monitoring channel overhead operation method in a receiving station WDM system, when a communication line between two WDM systems each configured with an optical transmission section layer, an optical multi-section layer, and an optical channel section layer has failed, Detecting, by the receiving station WDM system, a failure occurring in the communication line by detecting a loss of optical signal of the received main optical signal; If a failure is detected in the failure detection step, the optical WID system of the receiving station inserts a reverse abnormality detection signal into the optical signal alarm detection byte of the monitoring channel overhead transmitted back to the transmitting station WDM system, thereby transmitting the WDM WDM system. Informing the system of the failure detection, If a failure is detected in the failure detection step, the optical transmission section layer of the receiving station WDM system includes a step of transmitting a forward abnormal detection signal (down FDI) to the optical multi-layer layer and the optical channel section layer lower layer; Monitoring channel overhead operation method of a wavelength division multiplexing system. The method of claim 11, wherein the fault detection fact notification step, The supervisory channel overhead operation of the WDM system, characterized in that the optical multi-section layer of the receiving station WDM system inserts the fault status information into the status information monitoring byte of the monitoring channel overhead and transmits the fault status information to the transmitting station WDM system. Way. In two WDM systems, each of which consists of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, a communication line between the optical channel section layer and the optical multi-section layer of a transmitting station WDM system to transmit an optical signal, Or in the case of a functional failure in the optical multi-section layer, in the monitoring channel overhead operating method, If the transmitting station WDM system detects the light intensity of the input or output side optical signal of the optical multi-section layer and the light intensity of the optical signal is significantly lowered, between the optical channel section layer and the optical multi-section layer of the transmitting station WDM system. Or detecting a failure occurring in the optical multi-section layer; If a fault is detected in the fault detection step, the transmitting station WDM system inserts a forward abnormality detection signal into the optical signal alert detection byte of the monitoring channel overhead and inserts a kind of fault into the status information monitoring byte to indicate the fault occurrence fact. Surveillance channel overhead operating method in a wavelength division multiplexing system comprising the step of informing the receiving station WDM system. The method of claim 13, An optical multi-segment layer of the receiving station WDM system recognizes a forward abnormality detection signal of the alert detection byte, transmits a forward abnormality detection signal to a lower layer of the optical channel interval layer, and transmits back to the transmitting station WDM system And inserting a reverse abnormality detection signal into the optical signal alarm detection byte of the channel overhead and transmitting an alarm recognition fact to the transmitting station WDM system. In two WDM systems, each of which consists of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, when a monitoring channel failure of an optical multi-section layer of a transmitting station WDM system to transmit an optical signal occurs, the receiving station WDM In the monitoring channel overhead operating method in the system, Detecting an optical intensity of a monitoring channel through which the optical multi-section layer of the receiving station WDM system is received, and detecting an occurrence of a monitoring channel failure of the optical multi-section layer of the transmitting station WDM system; When the monitoring channel failure occurs, the receiving station WDM system inserts the reverse abnormality detection signal of the monitoring channel into the alarm detection byte of the monitoring channel overhead transmitted back to the transmitting station WDM system, and fails in the status information monitoring byte. And inserting a type into the transmitting station to transmit the WDM system to the transmitting station WDM system. In two WDM systems, each of which consists of an optical transmission section layer, an optical multi-section layer, and an optical channel section layer, a noise component of an optical signal transmitted due to an abnormal communication line between the WDM systems or deterioration of characteristics of a transmitting station WDM system. In this case, in the monitoring channel overhead operating method in the receiving station WDM system, Detecting, by the receiving station WDM system, whether or not the optical channel loss monitoring performance is deteriorated in the received optical signal, and detecting a BIP error by checking the parity of the received monitoring channel overhead; And when the BIP error is detected, inserting a remote error detection signal into the monitoring channel alarm detection byte of the monitoring channel overhead transmitted back to the transmitting station WDM system to the transmitting station WDM system. Surveillance channel overhead operating method of a wavelength division multiplex system, characterized in that.