KR100304722B1 - Data communication channel management device in optical subscriber transmission device - Google Patents

Abstract

The present invention relates to a data communication channel management apparatus in an optical subscriber transmission apparatus, and more particularly, an operation system for performing control / monitoring functions of a main control unit (MCU), a power station and an entire network of an optical subscriber transmission apparatus, and integration in a national company. The present invention relates to an apparatus for managing a data communication channel (DCC), which is a transmission path of operation-maintaining data exchanged between systems.

The present invention functions as a ROM for storing a driving program of a data communication channel management device, an operation memory for temporarily storing operation-maintenance data inputted and outputted through a data communication channel, and a path of data exchanged with a main control device. It consists of a memory unit consisting of a communication memory for the operation and the input and output of the operation-maintenance data through the operating memory. At this time, the overhead connection part is connected to the optical transceiver (OTRU) which is mounted on the optical subscriber transmission device and is responsible for processing the synchronous transport module signal (STM-1), and the packet connection part connects the operating system and the public data communication network (PSDN). LAN connection is connected via the integrated system and LAN (LAN).

As the network structure becomes more complicated and diversified, the necessity of a data communication channel (DCC) connection for exchanging operation-maintenance data between each network component is increasing, and the present invention can be effectively used for this purpose.

Description

A unit to handle Data Communication Channels in Fiber Loop Carrier systems

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication channel management apparatus in an optical subscriber transmission apparatus. In particular, the present invention relates to an optical subscriber transmission apparatus performing a communication function according to a synchronous digital hierarchy (SDH), which is required for performing a network management function. The present invention relates to an apparatus for managing a data communication channel (DCC), which is a channel for transmitting and receiving data such as alarm information, performance information, and operation information.

FIG. 1 is a basic network diagram of an optical subscriber transmission apparatus, which is composed of a main station 10 (Central Office Terminal) and a remote station (11 Remote Terminal). At this time, the master station 10: COT is connected to each subscriber through the general switching line and the dedicated line, and these subscribers are connected to the general telephone subscriber or the dedicated line subscriber through the remote station 11: RT.

The main station 10 (COT) and the remote station 11 (RT) constituting such an optical subscriber transmission device are connected by the optical path 12 to perform communication by light with each other. At this time, the communication by the light between the main station 10: COT and the remote station 11: RT is performed using the synchronous transmission method. In the synchronous transmission method, each signal is a path according to the synchronous digital hierarchy (SDH). It is then multiplexed according to and transmitted and received.

On the other hand, in the country where the optical subscriber transmission device is installed, an integrated system 21 for integrated management and control of all the optical subscriber transmission devices in the national office is constructed. Such integrated system 21 is implemented as a workstation. It is common to be.

In addition, the optical subscriber transmitters 10 and 11 are connected through an operation system that performs overall management and management functions of the entire network and a public switched data network (PSDN).

2 is a block diagram of an optical subscriber transmission device, and includes a channel device 210, a multiplexing and demultiplexing device 220, an optical transceiver 230, a main control device 240, and the like.

Here, the channel device 210 is connected to the subscriber line, such as voice line, data line, and Integrated Services Digital Network (ISDN) line to make a DS1E-class signal and delivers it to the multiplexing and demultiplexing device 220.

The multiplexing and demultiplexing apparatus 220 multiplexes the DS1E signal received from the channel apparatus 210 through a predetermined path according to the synchronous digital hierarchy (SDH), thereby synchronous transport module signal (STM-1: Synchronous Transport Module) excluding the section overhead. After generating -1), it performs the function of sending to the optical transceiver 230 and its reverse function.

The optical transceiver 230 is physically connected to the optical path 12 and adds section overheads 192 and 193 to the signal sent from the multiplexing and demultiplexing apparatus 220 to complete the synchronous transport module signal 190: STM-1. ) Is converted into an optical signal and transmitted to the optical path 12 and its reverse function.

On the other hand, the main control unit 240 is a device that performs the overall control function of the optical subscriber transmission apparatus, and monitors each component to collect the alarm status, performance status, and operating status information and take action accordingly, It performs the function of transmitting predetermined operation-maintenance information so that the other party can grasp such alarm state, performance state and operation state.

3 is a structural diagram of a synchronous transmission module signal 190: STM-1 processed by the optical transceiver 230, and one synchronous transmission module signal 190: STM-1 includes 2430 bytes in total (270 bytes). Row and column of 9 bytes), section overhead (192, 193) consists of player section overhead (192) and multiplexer section overhead (193).

At this time, among the data of columns 1 to 9, rows 1 to 3 are locations where the player section overhead 192 is located, and rows 5 to 9 are locations where the multiplexer section overhead 193 is located. to be.

In addition, 9 bytes in 10 columns are places where the upper path overhead (POH: Path Overhead) is located, and 270 columns in the remaining 11 columns are used as payload spaces. The data located at is used to designate the location of payload.

Table 1 below summarizes each overhead byte and its role of the synchronous transmission module signal 190: STM-1.

Segment overhead Frame bytes A1, A2 A1 = "11110110" A2 = "101000" Error check byte B1 Position at player interval overhead (8 bits) B2 Position in multiplexer interval overhead (24-bit) Data communication channel D1, D2, D3 For maintenance (192 Kbits / s) D4-D12 For maintenance (576 Kbits / s) Batting line E1, E2 Tarmac voice channel STM-1 signal identifier C1 Use to identify each STM-1 signal Transmission line protection byte K1, K2 Used for transmission line switching User channel byte F1 Custom bytes Pointer H1, H2 Marks the starting point of synchronized payload H3 Stuffing byte Path overhead Error check byte B3 For error checking on paths (8 bits) Alert send byte C2, G1 For sending alarms on path Path trace bytes J1 For verifying continuous connection

Specifically, the function of each overhead byte of Table 1 shown above is a frame byte (A1: 3 bytes, A2: 3 bytes) to specify the initial position of the corresponding synchronous transport module signal, and the error checking byte ( B1, B2) are used to check for errors through bit interleaved parity (BIP).

The byte for the data communication channel (DCC) is composed of the first data communication byte (D1) to the twelfth data communication byte (D12), and the first data communication byte (D1) to the third data communication byte (D3). ) Is used to transmit and receive maintenance data of 192 Kbits / sec, and the fourth data communication byte D4 to twelfth data communication byte D12 are used to transmit and receive maintenance data of 576 Kbits / sec.

The first pruning line byte E1 and the second pruning line byte E2 are channels used for transmitting and receiving voice data through the order wire, and the synchronous transport module signal identification byte C1 is a signal for each synchronous transport module. To distinguish between them.

The first transmission path protection byte (K1) and the second transmission path protection byte (K2) used for transmission channel switching are used to change the transmission path in case of an error in the transmission path, and the user defined byte (F1) is used for each user. Can be used according to.

The management unit signal pointers H1, H2, and H3 are used to mark the point where the payload of each management unit signal AU is loaded, and the path error check byte B3 is an error check that appears on the path. Use for

In addition, the alert transmission byte (C2, G1) is used for the alert transmission on the path, the path trace byte (J1) is used to verify the continuous connection state.

Meanwhile, as the network structure becomes more complicated and diversified, the necessity of data communication channel (DCC) connection for the exchange of operation-maintenance data between each network component is increasing. Operating-maintaining each other by relaying operation-maintenance data (DCC data) between the operating system 40 to be managed, the integrated domestic system 21 (workstation), and the main controller 240 of the optical subscriber transmission device. You need a device that allows you to send and receive data.

Accordingly, the present invention has been made to meet the above needs, the alarm information between the main control device of the operation system, the integrated management system (workstation), and the optical subscriber transmission apparatus for managing the power, the network as a whole, An object of the present invention is to provide an apparatus for managing a data communication channel (DCC), which is a channel for transmitting and receiving data such as performance information and operation information.

In order to achieve the above object, the data communication channel management apparatus in the optical subscriber transmission apparatus according to the present invention is a ROM for storing a drive program of the data communication channel management apparatus, the operation input-output through the data communication channel- A memory unit including an operation memory for temporarily storing maintenance data, and a communication memory serving as a path for data exchanged with the main control device; An optical transceiver (OTRU) which performs a function of extracting or inserting a section overhead with respect to the synchronous transport module signal (STM-1) transmitted / received to the optical subscriber transmitter, and located in a corresponding region of the operation memory. An overhead connection unit for transmitting data to the optical transceiver or performing a reverse function thereof; A packet connection unit connected to the operating system through a public data communication network (PSDN) to transmit data in a corresponding region of the operating memory to the operating system or to perform a reverse function; A LAN connection unit connected to the in-house integrated system through a LAN to send data in a corresponding region of the operation memory to the in-house integrated system, or to perform a reverse function; A central processing unit which controls the memory unit, the overhead connection unit, the packet connection unit, and the LAN connection unit to perform the corresponding function; And a logic controller configured to perform system bus arbitration of the central processing unit, address decoding for each of the components, and a refresh function of the operation memory.

1 is a basic network configuration of an optical subscriber transmission device,

2 is a block diagram of an optical subscriber transmission device,

3 is a structural diagram of a synchronous transmission module signal STM-1 processed by an optical transceiver;

4 is a block diagram of an optical subscriber transmission apparatus using a data communication channel management apparatus according to the present invention;

5 is a configuration diagram of a data communication channel management apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: Main station (COT) 11: Remote station (RT)

12: optical path 21: integrated system in the country

23: LAN 30: Public Data Network (PSDN)

40: operating system 190: synchronous transport module signal (STM-1)

192: player section overhead 193: multiplexer section overhead

210: channel device 220: multiplexing and demultiplexing device

230: Optical transceiver (OTRU) 240: Main control unit (MCU)

250: data communication channel management device 410: memory unit

411: Rom 412: Operational memory

413: communication memory 420: central processing unit (CPU)

430: overhead connection 440: packet connection

450: LAN connection unit 460: logic control unit

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

4 is a block diagram of an optical subscriber transmission apparatus using a data communication channel management apparatus according to the present invention, which includes a channel apparatus 210, a multiplexing and demultiplexing apparatus 220, an optical transmitting and receiving apparatus 230, and a main control apparatus ( 240 and the like perform the same function as the components shown in FIG. 2. At this time, the data communication channel management apparatus 250 of the present invention is an operation system for performing the control / monitoring function of the main control unit 240, optical transceiver 230, integrated system 21 in the country, and the entire network. And the like, and relay operation-maintenance data exchanged with each other.

First, the operation of the data communication channel management apparatus 250 according to the present invention will be briefly described.

The data communication channel management apparatus 250 according to the present invention receives data transmitted from the main control unit 240 (MCU) for monitoring and controlling the alarm state, performance, and operation state of the optical subscriber transmission device through the communication memory 413. Receive the data communication channel information sent from the optical transceiver 230. In this case, the data communication channel information received from the optical transceiver 230 is data D1 to D12 separated from the section overhead data 192 and 193 of the synchronous transport module signal 190: STM-1 sent from the power station.

Also, the operation-maintenance data transmitted from the operation system 40 through the public data communication network 30: PSDN is received through the packet connection unit 440, and the operation-maintenance transmitted by the integrated system 21 in the domestic company. Receive the data through the LAN connection 450.

Each operation-maintenance data received in this way is stored in the corresponding region of the operation memory 412 of the memory unit 410 once under the control of the central processing unit 420, and then the optical transceiver through the overhead connection unit 430 Or to the operating system 40 through the packet connection unit 440, or to the integrated system 21 (workstation) within the office, via the LAN connection unit 450, or the communication memory 413. It is sent to the main control unit 240 through.

Through this series of operations, the relay function of the operation-maintenance data is performed.

Now, each component of the present invention will be described in detail.

The memory unit 410 temporarily stores the ROM 411 for permanently storing a driving program required for the operation of the data communication channel management apparatus 250 according to the present invention, alarm information of the system, performance monitoring information, and information necessary for operating the system. The operation memory 412, and the communication memory 413 used for data exchange with the main control unit 240.

Since the drive program of the data communication channel management apparatus 250 is important information that must be stored at all times, the drive program is implemented using the ROM 411, and a program capable of updating the drive program as necessary may be embedded therein. Therefore, it is preferable to implement in a flash ROM capable of both writing and reading. The programs stored in the ROM 411 include a driving program (operation program), a program for download of an update (Down Load), and ROM control program for program update.

The operation memory 412 is a memory used to temporarily store data generated during the operation of the data communication channel management apparatus 250, and stores alarm information, performance monitoring information, and volatile information necessary for operating the system. As an element, it is desirable to implement using DRAM.

The operation memory 412 is a data transmission and reception with the integrated system 21 in the domestic company via the LAN connection unit 450, the operating system 40 via the public data communication network 30 (PSDN) via the packet connection unit 440. After transmitting and receiving data, data to and from the optical transceiver 230 through the overhead connection unit 430, and data to and from the main controller 240 through the communication memory 413, the central processing unit The control unit 420 outputs to the corresponding port.

At this time, since the CPU 420 needs to know where the data from which port is located in the operation memory 412, a predetermined memory map in which data to be exchanged for each port is located is defined.

The communication memory 413 serves as a path for data exchange with the main controller 240 (MCU) of the optical subscriber transmission device. One preferred embodiment of such communication memory 413 is to implement using Dual Port RAM.

The overhead connection unit 430 is connected to the optical transceiver 230 that is responsible for the processing of the synchronous transport module signal 190 (STM-1) in the optical subscriber transmission device to exchange operation-maintenance data. At this time, since the data transmitted to the optical transceiver 230 is multiplexed to the synchronous transport module signal and transmitted to the optical path 12, the operation-maintaining data to be transmitted to the power station is a target.

Specifically, the overhead connection unit 430 performs a Link Access Procedure on the D-channel (LAPD) protocol function. A preferred embodiment is implemented using a Motorola MC68606 microprocessor as an LAPD controller, and transmits and receives optical signals. Data communication channel information (D1 byte to D12 byte) extracted from the device 230 is received using the LAPD protocol. The received data is written to the corresponding memory area of the operating memory 412.

In addition, when the CPU 420 transmits data to be transmitted from the corresponding memory area of the operation memory 412 to the power station, the CPU 420 receives the data and transmits the data to the optical transceiver 230 using the LAPD protocol.

In this case, when transmitting or receiving data through a plurality of logical links, a direct memory access (DMA) control function is performed to reduce the load of the central processing unit 420, and preferably a predetermined number of pre-inputs. Use a FIFO to buffer the transmission and reception of data. In addition, a basic serial communication function is performed for protocols other than LAPD.

The packet access unit 440 connects with a predetermined public data communication network 30 (PSDN) using LAPB (Link Access Protocol-Balanced) of the CCITT Recommendation X.25 protocol to exchange data with the operation system 40 for operation-maintenance. Receive.

That is, the data sent from the operating system 40 is received using the LAPB protocol, and the received data is recorded in the corresponding area of the operation memory 412. In addition, the data to be transmitted to the operating system 40 side is read by the central processing unit 420 from the corresponding area of the operation memory 412, the packet connection unit 440 is a public data communication network (30: PSDN) side in accordance with the LAPB protocol To transmit. At this time, in order to reduce the load on the central processing unit 420, a frame is transmitted and received using a DMA controller, and a modem interface is realized.

In other words, the packet connection unit 440 may perform a function of realizing an interface between a data terminal equipment (DTE) and a data termination device (DCE) for transmitting and receiving packet data. The circuit terminating device (DCE) is a device which takes a physical level interface between a signal from a data terminal and a signal from a station switching facility.

The LAN connection unit 450 performs a LAN matching function in a company to connect a master station in a company or remote stations (RT) in the same area with each other.

Specifically, by connecting through a local area integrated system 21 and a local area network (LAN), it is possible to establish its own data through a data communication channel (DCC) with a main station or a local remote station (RT) in the same country. It is used as an information exchange path for operation, administration and maintenance.

That is, the operation maintenance data sent from the in-house integrated system 21 is received through the LAN 23 and recorded in the corresponding area of the operation memory 412, and the recorded data is controlled by the central processing unit 420. Is output to a predetermined destination port. In addition, the data to be transmitted to the integrated system 21 in the country is read by the central processing unit 420 from the corresponding region of the memory 412 for operation, the LAN connection portion 450 is the integrated system 21 through the LAN (23) To send.

The logic control unit 460 is a mediation function of the system bus 421 which arbitrates the authority to use the system bus 421 among the components of the data communication channel management apparatus 250, and the interrupt function generated by each component. A control function, an address decoding function for decoding an address of each component, and a refresh function of the operation memory 412 are performed.

On the other hand, the CPU 420 is a component in charge of the overall control function of the data communication channel management unit 250.

In detail, data received from the main controller 240, the optical transceiver 230, the operation system 40, and the in-house integrated system 21 may be controlled to provide a corresponding area of the operation memory 412. It also records and reads data from the corresponding area of the operation memory 412 and controls a series of processes to output to the corresponding port.

As the network structure becomes more complicated and diverse, the necessity of data communication channel (DCC) connection for the exchange of operation-maintaining data between each network component is increasing, and the present invention can be efficiently used in response to this need. have.

Claims (1)

Equipped with the optical subscriber transmission device, the transmission path for the operation-maintaining data exchanged between the main control device of the optical subscriber transmission device, an operation system that performs the control / monitoring function of the whole country, the entire network, and an integrated system in the national company. A data communication channel management apparatus for managing an in data communication channel (DCC), A ROM for storing a driving program of the data communication channel management device, an operation memory for temporarily storing the operation-maintenance data input / output through the data communication channel, and a path for data exchange with the main control device. A memory unit comprising a communication memory for performing; An optical transceiver (OTRU) which performs a function of extracting or inserting a section overhead with respect to the synchronous transport module signal (STM-1) transmitted / received to the optical subscriber transmitter, and located in a corresponding region of the operation memory. An overhead connection unit for transmitting data to the optical transceiver or performing a reverse function thereof; A packet connection unit connected to the operating system through a public data communication network (PSDN) to transmit data in a corresponding region of the operating memory to the operating system or to perform a reverse function; A LAN connection unit connected to the in-house integrated system through a LAN to send data in a corresponding region of the operation memory to the in-house integrated system, or to perform a reverse function; A central processing unit which controls the memory unit, the overhead connection unit, the packet connection unit, and the LAN connection unit to perform the corresponding function; And And a logic control unit for performing system bus arbitration of the central processing unit, address decoding for each of the components, and a refresh function of the operation memory. Management device.