KR20000027950A - Optical repeater with remote monitoring and controlling functions in synchronous digital hierarchy - Google Patents

Abstract

PURPOSE: An optical repeater with remote monitoring and controlling functions in a synchronous digital hierarchy is to continuously maintain SOH(Section over head) frame although the hierarchy of digital signal is converted. CONSTITUTION: An optical repeater comprises a first to third monitoring signal controller(41,43,45) having a function that separates SOH frame data from a first to third optical transceivers(34,37,38) inside an optical relay equipment and extracts, creates, and adds, the first to third monitoring signal controller being connected through LAN(Local area network). The first monitoring signal controller separates a monitoring and controlling data frame applied from the first optical transceiver. A monitoring signal transfer member(50) classifies the monitoring and controlling signal applied from the first monitoring signal controller by a corresponding target place. The second and third monitoring signal controllers apply the monitoring and controlling signal received from the monitoring signal transfer member to the second and third optical transceivers, respectively, and create and add the monitoring and controlling data frame.

Description

Optical relay with remote monitoring and control of synchronous digital hierarchy

The present invention relates to the remote control and monitoring of optical end station devices used in a synchronous digital hierarchy transmission network in an optical communication line. In particular, the optical end station devices and the relay station devices are located at remote locations, whereby each optical end station device maintains a smooth communication. In order to monitor and control the other end station device, the overhead of the section included in the synchronous transmission module 1 (STM-1) frame of 155.520 Mbps is transmitted. Section Over Head) The present invention relates to a device for transmitting a frame to a remote optical station without interruption.

DS3 level signal, which is 44.736Mbps, is used for data transmission between optical end station devices.When 1: 1 remote optical end station device is connected, the DS3 level signal is transformed into STM-1 level frame signal and transmitted and received. The SOH frame information for monitoring and controlling the optical station in remote state can be used as it is. However, if the remote station in the remote station is 2 or more, DS3 level signals are multiplexed to 155.520 Mbps, and then demultiplexed. It must go through the process of dividing into DS3 level signal necessary for the station equipment. However, in the process of multiplexing and demultiplexing, data of the SOH frame for monitoring and controlling each station apparatus is not transmitted.

One (1) STM-1 signal multiplexes up to three DS3 signals, and the remaining bytes are used as SOH frames.

Section Overhead (SOH) frame of STM-1 class signal that can monitor and control the other station equipment in SDH transmission network has several bytes allocated for frame synchronization, relay section monitoring and multiple section monitoring. Among these, bytes in the D1 to D12 areas are used for data communication between the relay section and the multi-section. They are used for communication between the main processor or the network monitoring processor of each device. It controls the remote optical station device by transmitting to the optical station device.

Hereinafter, a configuration according to the related art will be described with reference to the accompanying drawings.

FIG. 1 is a frame diagram showing a frame structure of STM-1, and FIG. 2 is a diagram illustrating a monitoring and control data flow between a 1: 1 optical end device according to an embodiment of the prior art, and FIG. 1 is a block diagram of an optical end station connection function according to an embodiment, FIG. 2B is a detailed functional block diagram of an optical relay device according to a conventional 1: 1 embodiment, and FIG. 3 is a block diagram of an embodiment according to the prior art. 3A is a block diagram of an optical end station connection function according to a conventional 1: many embodiment, and FIG. 3B is an optical diagram of a conventional 1: many one embodiment. Detailed functional block diagram of the relay device is shown.

As shown in FIG. 1, the frame structure of the synchronous transmission module 1 st order STM-1 is composed of 270 horizontal columns and 9 vertical rows, of which 1 to 9 columns are used as section overhead (SOH) frames. Among these, D1 to D12 bytes are used as data communication bytes, and are used for monitoring and control of the far-end optical station station located remotely.

2a and b according to the prior art, the 1: 1 optical end station configuration includes a first optical end station 10 for inputting and outputting an STM-1 level signal including one DS3-class signal; A second optical end station device 20 having a remote location and having a function of inputting and outputting an STM-1 level signal including one DS3 level signal, and the first optical end station device 10 and the second optical end station device 20; It consists of an optical repeater 30 having a function of relaying the STM-1 class of the signal, the optical repeater 30 is connected to the first optical end station 10 to relay and transmit the STM-1 class signal The first optical transceiver 33 and the second optical end station 20 are connected to the second optical transceiver 36 having a function of relaying and transmitting STM-1 level signals.

In addition, as an embodiment of the prior art as shown in Figs. 3a and 3b, a plurality of optical end station devices are configured to multiplex STM-1 level signals by inputting DS3 level signals necessary for data transmission of each terminal device. The first optical station device 12 having the function of demultiplexing the signal input to the -1 level into the DS3 level signal necessary for each terminal device, and transformed into the DS3 level signal by receiving the STM-1 level signal at a remote location. And a second optical end station device 22 and a third optical end station device 25, and the first optical end station device 12 and A relay device 35 having a function of relaying STM-1 level signals of the second optical end station device 22 and the third optical end station device 25 is provided, and the relay device 35 includes a first optical end station device ( 12) is connected to STM-1 level signal and demultiplexed to DS3 level signal or DS3 level signal to STM-1 level signal. It is connected to the first optical transceiver 34 and the second optical end station 20 having a function of neutralizing and converting a DS3 level signal into an STM-1 level signal or a STM-1 level signal into a DS3 level signal. A second optical transceiver 37 and a third optical transceiver 38 are configured.

Hereinafter, the operation of the remote monitoring and control according to the prior art will be described with reference to the accompanying drawings.

As an example, the 1: 1 remote monitoring and control optical station apparatus as shown in FIGS. 2A and 2B may be configured to convert a signal in which the DS3-class signal is converted into an STM-1 class signal by a terminal device connected to the first optical station apparatus 10. Applied through the optical cable, necessary monitoring signals and control signals are added to the SOH frame and output to the optical path. However, the STM-1 signal is amplified and reconstructed by the optical relay device 30 in order to transmit the signal at a longer distance, and then applied to the optical transmission path, thereby applying the STM-1 to the second optical end station device 20 at a remote location. A signal of -1 level is transmitted, and a STM-1 level signal is received from a terminal device connected to the second optical end station device 20 to extract necessary processing signals and control signals. The same process is sent from the second optical end station device 20 to the first optical end station device 10.

In this case, the relay device is connected to the first optical end station device 10 and connected to the first optical transceiver 33 and the second optical end station device 20 to transmit and receive STM-1 signals and to process the STM-1 level signal. And a second optical transceiver 33 having a function of transmitting and receiving a first-class signal, and the first optical transceiver 33 and the second optical transceiver 36 are connected in a pattern of a printed circuit board in the optical relay device. STM-1 level signal is transmitted and received.

Therefore, the apparatus having the above-described configuration includes the monitoring and control signals added to the SOH-1 frame of the STM-1 level signal in the first optical station device 10 and the second optical station device 20, and the optical relay device. Since there is no change of the hierarchy in which the shape of the signal is deformed while passing through the 30, the first optical station station 10 and the second optical station station 20 at the remote places It is possible to extract the monitoring and control signals added to the SOH frame.

However, as shown in Figs. 3A and 3B, the multiple remote monitoring and control optical end station apparatus has a 44.736 Mbps DS3 class signal having different arrival destinations from two (2) terminal apparatuses connected to the first optical end station apparatus 12. Is then multiplexed, hierarchically transformed into an STM-1 signal with an SOH frame containing monitoring and control data, and applied to the optical transmission path. The relay device 35 receiving the STM-1 signal is demultiplexed to separate and send signals of different destinations to the second optical end station device 22 and the third optical end station device 25, respectively. (Demultiplexing)

Demultiplexing is performed by separating the STM-1 level signal, which the first optical transceiver 34 receives from the first optical end station device 12, into two DS3 level signals, and separating the optical signal of the corresponding destination. It applies to the 2nd optical transceiver 37 and the 3rd optical transceiver 38 which are connected by the station apparatus with the optical cable. The second optical transceiver 37 and the third optical transceiver 38 reclassify the DS3 level signal into an STM-1 level signal, and the second optical end device 22 and the third optical end station through an optical transmission path. By transmitting to the device 25, the terminal device can receive.

Therefore, if the level is changed to a DS3-class signal, the DS3-class signal does not have a SOH frame containing data for monitoring and controlling the remote optical station, so there is a problem in that the remote optical station can not be monitored and controlled.

As described above, the remote supervisory control apparatus of the synchronous digital hierarchy according to the related art is generated by changing and re-creating the section overhead (SOH) of a function capable of monitoring and controlling the digital signal hierarchy. It is to solve the problem that the control information is not transmitted and eventually cannot monitor and control the remote station apparatus. By separately extracting and supplying the SOH frame, the monitoring and control information changes the digital signal hierarchy. Even if it is, the object is to solve the problem by providing a device to keep the SOH frame is maintained.

A feature of the present invention for achieving the above object is the first, second, and third optical transceivers inside the optical relay device, the function of separating, extracting, generating and adding SOH frame data; In the optical relay device consisting of the first, second and third optical transceivers by connecting the second and third monitoring signal controller to the LAN, the SOH frame data can be continuously transmitted. A supervisory signal controller having a function of separating a supervisory and control data frame from a digital signal applied to the transceiver, and a supervisory signal having a function of separately outputting supervisory and control signals applied from the first supervisory signal controller for respective destinations; A transmission medium and monitoring and control signals applied from the monitoring signal transmission medium are applied to the second optical transceiver and the third optical transceiver, respectively. And generating a control data frame and adding the second monitor signal to the controller of the function and it is composed of a third supervisory signal controller.

1 is a frame diagram showing a frame structure of an STM-1;

FIG. 2A is a block diagram of an optical end station connection function according to a conventional 1: 1 embodiment.

2B is a detailed functional block diagram of an optical relay device according to a conventional 1: 1 embodiment;

Figure 3a is a block diagram of the optical end station connection function according to the conventional 1: many embodiments;

3B is a detailed functional block diagram of an optical relay device according to a conventional 1: many embodiment;

4 is a functional block diagram of an optical relay apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

10,12,20,22,25: optical end station device 30,35: optical repeater

33,34,36,37,38: Optical transceiver 41,43,45: Surveillance signal controller

50: surveillance signal transmission medium

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

4 is a functional block diagram of an optical relay apparatus according to the present invention.

Referring to Fig. 4 and Fig. 3 according to the prior art, the structure of the present invention will be described. In the optical relay device comprising first, second and third optical transceivers, A second optical transceiver 37 and a third optical transceiver (37) and a third optical transceiver connected to an optical transmission station and the optical end station of the corresponding destination by changing the hierarchy of the STM-1 level signal to two DS3 level signals A first supervisory signal controller 41 having a function of separating a supervisory and control data frame from a digital signal applied to a first optical transceiver 34 having a function applied to the second signal and separating the supervisory signal by the corresponding destination, respectively, 1 the monitoring signal transmission medium 50 having a function of transmitting the monitoring and control signals applied from the monitoring signal controller 41 to the optical transceiver and the monitoring signal controller of the corresponding destination; And a second supervisory signal controller 43 and a third supervisory signal controller having a function of generating and adding a supervisory and control data frame by applying a control signal to the second optical transceiver 37 and the third optical transceiver 38, respectively. It consists of 45.

Hereinafter, the operation by the configuration of the present invention will be described in detail.

The first optical transceiver 34, which receives the STM-1 level signal from the first optical station device 12 through the optical transmission path, provides two (2) 44.736 Mbps signals of 155.520 Mbps including an SOH frame. Separate into DS3 level signal. In this separation, the SOH frame signal is lost. Accordingly, the first supervisory signal controller 41 detects the supervisory and control signals contained in D1 to D12 of the SOH frame signal before the STM-1 class signals are separated into the DS3 class signals, that is, the demultiplexed signals, and for each destination. Separately extract and apply to the monitoring signal transmission medium (50).

The separated first monitoring and control (SOH frame) signal is a monitoring and control signal (SOH frame) generated by the first optical end station device 12 to a signal applied from two terminal devices, and indicates data corresponding to the destination. And data signals for controlling and monitoring the optical end station apparatus of the destination are recorded in the bytes D1 to D12 of FIG.

The surveillance signal transmission medium 50 receiving such a signal is formed of a bidirectional information transmission medium such as a LAN, and monitors and controls the SOH frame of the authorized SOH frame by the second and third surveillance signal controllers (the corresponding destinations). 43, 45).

In addition, the second optical transceiver 37 and the third optical transceiver 38, each of which receives the DS3-class signal from the first optical transceiver 34 through the pattern line of the printed circuit board, transmit the DS3-class signal to the STM-1. The hierarchical change is made by a high level signal, but the D1 to D12 bytes of the generated SOH frame include monitoring and control data necessary for monitoring and controlling the second optical station device 22 and the third optical station device 25. There will be no.

At this time, the second supervisory signal controller 43 is applied to the second optical transceiver 37 to the SOH frame data including the monitoring and control signals of the optical end station device, and the monitoring and control signals are included The second optical transceiver 37 receiving the SOH frame data records the monitoring and control signal data of the SOH frame applied from the second monitoring signal controller 43 in the newly formed SOH frame.

The 155.520 Mbps STM-1 level signal completed by the second optical transceiver 37 is transmitted to the second optical end station 22 through an optical transmission path, and the second optical end station device transmits the transmitted STM-1 level signal. SOH frame data is separated from and monitored and controlled.

The third supervisory signal controller 45 and the third optical transceiver 38 also work the same.

In addition, the first supervisory signal controller 41 does not only extract SOH frame data from the first optical transceiver 34, but also SOH like the second supervisory signal controller 43 and the third supervisory signal controller 45. Frame data may be recorded, and the second surveillance signal controller 43 and the third surveillance signal controller 45 may also separate and extract SOH frame data having the same function as the first surveillance signal controller 41. .

In addition, the monitoring signal transmission medium 50 may apply the SOH frames including the monitoring and control signals received from the first monitoring signal controller 41 to the second and third monitoring signal controllers 43 and 45. In addition, the monitoring and control signals of the SOH frames applied from the second and third monitoring signal controllers may be applied to the first monitoring signal controller 41.

Therefore, using the conventional apparatus, 1: multiplexing or demultiplexing is performed in an optical relay apparatus to which a plurality of optical end stations are connected, that is, multiplexing up to three DS3-class signals of each terminal apparatus. In the process of hierarchical conversion into STM-1 level signal or demultiplexing to DS3 level in order to send STM-1 level signal to terminal equipment via each corresponding optical station, STM Although there was a problem in that the continuity was interrupted in the SOH frame data of the -1 class signal and the monitoring and control could not be performed, the apparatus of the present invention uses a LAN, a bidirectional signal transmission medium, for each optical transceiver. SOH frame data containing monitoring and control data is extracted from STM-1 level signal, and monitoring and control data is also available in the process of multiplexing and demultiplexing to send to each destination. Contents are not cut off by passing to continuity, each of the optical termination equipment is capable of one another monitoring and control.

As described above, according to the optical relay device that enables remote monitoring and control of the synchronous digital hierarchy according to the present invention, each optical end station in a synchronous digital hierarchy (SDH) transmission network is located at a remote location. SOH frame data of STM-1 level signal which can monitor and control the other station's optical end station regardless of hierarchy can be sent continuously so that it can easily manage remote network in optical communication There is.

Claims (5)

In the optical relay device composed of a plurality of optical transceivers, A first surveillance signal controller having a function of separating a surveillance and control data frame from a digital signal applied to the first optical transceiver; A monitoring signal transmission medium having a function of separating and outputting the monitoring and control signals applied from the first monitoring signal controller for respective destinations; A second supervisory signal controller and a third supervisory signal configured to generate and add a supervisory and control data frame by respectively applying the supervisory and control signals applied from the supervisory signal transmission medium to the second optical transceiver and the third optical transceiver, respectively. An optical relay apparatus for remote monitoring and control of a synchronous digital hierarchy, comprising a controller. According to claim 1, The first supervisory signal controller applies the supervisory and control data received from the supervisory signal transmission medium to the first optical transceiver to generate and add a supervisory and control data frame. Optical repeater. According to claim 1, And the second supervisory signal controller and the third supervisory signal controller separate the supervisory and control data frames from the digital signals applied to the second optical transceiver and the second optical transceiver. Optical repeater According to claim 1, The optical relay device for remote monitoring and control function of a synchronous digital hierarchy, characterized in that the monitoring signal transmission medium is a bidirectional LAN. According to claim 1, The monitoring signal transmission medium is a remote monitoring and control function optical relay device of a synchronous digital hierarchy, characterized in that the combined monitoring and control signals respectively applied to output a single monitoring and control signal