KR100284006B1 - Optical Transceiver in Optical Subscriber Transmitter - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transceiver in an optical subscriber transmission apparatus, which is used in a predetermined optical subscriber transmission apparatus to convert a management unit signal (AU-3) into a synchronous transport module signal (STM-1) and transmit it to an optical path. It receives the STM-1 signal from the optical path and outputs it in AU-3 signal units.

Among the components of the present invention, the optical connection part is connected to the optical path and performs a conversion function between the serial STM-1 signal in the form of an optical signal and the serial STM-1 signal in the form of an electrical signal. The serial / parallel converter may receive a serial STM-1 signal in the form of an electrical signal from the optical connector and convert the parallel STM-1 signal in parallel, or receive a predetermined parallel STM-1 signal, convert the serial STM-1 signal, and output the serial STM-1 signal to the optical connector.

The STM-1 signal processor processes parallel STM-1 signals output from the serial / parallel converter and outputs them in units of AU-3 signals aligned to a predetermined transmission clock, or receives and processes a predetermined number of AU-3 signals from the outside. To make a parallel STM-1 signal and send it to the serial / parallel converter.

The external device connection section connects the predetermined external device and the STM-1 signal processing section to the predetermined section overhead data or control signal, and the status display section displays predetermined status information.

Description

An Optical Transmit / Receive Unit for Fiber Loop Carrier System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transceiver in an optical subscriber transmission device, and in particular, used in an optical subscriber transmission device using a synchronous transmission method, and receives three management unit signals (AU-3). -1: A device made of a Synchronous Transport Module that transmits to a fiber or performs the reverse process.

1 is a basic network configuration diagram of an optical subscriber transmission apparatus, and includes a main station (Central Office Terminal) and a remote station (Remote Terminal). At this time, the master station 10 is connected to each subscriber through a general switching line, a leased line, a local area network (LAN), and the like, and these subscribers are connected to the ordinary telephone subscriber or the leased line subscriber through the remote station 11. Connected with

The main station 10 and the remote station 11 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 master station 10 and the remote station 11 is performed by using a synchronous transmission method. In the synchronous transmission method, each signal is multiplexed according to a synchronous digital hierarchy (SDH). It is multiplexed by the procedure and then transmitted and received.

FIG. 2 is a diagram illustrating a mapping structure of a DS1 signal to a synchronous transport module signal (STM-1) and a DS1 signal 110 is mapped to a lower box (C-11: 120) having a container structure. When the lower path overhead 131 is added to the lower box C-11: 120, the lower virtual box 130 becomes a lower virtual box 130.

In addition, when a pointer 141 indicating the position of the lower virtual box 130 is added to the lower virtual box 130: VC-11, it becomes a level unit signal 140: TU-11, and the level unit signal 140. Four are gathered to form a hierarchical unit group signal (150: TUG-2). The pointer 151 to the four hierarchical unit signals (140: TU-11) is the front of the hierarchical unit group signal (150: TUG-2). It is located at all.

When seven hierarchical unit group signals 150 (TUG-2) are gathered and the upper path overhead 161 is added to the foremost part, a high-level virtual box signal 160: VC-3 is generated. When the pointer 171 is added to the 160, a management unit signal 170: AU-3 is generated, and three management unit signals 170 are gathered to form a management unit group signal 180: AUG. When a section overhead is added to the unit group signal 180 (AUG), the synchronous transport module signal 190 (STM-1) is finally generated.

On the other hand, in the optical subscriber transmission apparatus 10, 11 which communicates using the synchronous transmission method, the optical unit 12 is connected to the optical line 12, and the management unit signal 170: AU-3, which appears during the synchronous multiplexing procedure, is synchronized with the synchronous transport module. A signal 190: STM-1 is transmitted to the optical path 12, or a synchronous transport module signal 190: STM-1 is received from the optical path 12 to control unit signal 170: AU-3 unit. You need a device that can output

Accordingly, the present invention has been devised to meet the necessity as described above. The control unit signal 170: AU-3, which is displayed during the synchronous multiplexing procedure by being connected to the optical line 12, receives the synchronous transport module signal 190: STM-1. Device to transmit to the optical path 12, or to receive the synchronous transport module signal 190 (STM-1) from the optical path 12 and output in the unit of the management unit signal (170: AU-3), that is, the optical It is an object of the present invention to provide an optical transceiver in a subscriber transmission apparatus.

In order to achieve the above object, the optical transceiver in the optical subscriber transmission device according to the present invention is connected to the optical path, and the serial synchronous transport module signal (STM-1) in the form of an optical signal and the serial synchronous transport in the form of an electrical signal. An optical connection unit performing a conversion function between the module signals STM-1; The optical synchronous transport module signal STM-1 in the form of an electrical signal is received from the optical connection and converted in parallel or outputted after receiving a predetermined parallel synchronous transport module signal STM-1 and converted to serial. A serial / parallel converter for outputting to the connection unit; The parallel synchronous transport module signal STM-1 output from the serial / parallel conversion unit is processed and output in units of a management unit signal AU-3 aligned with a predetermined transmission clock, or a predetermined number of management unit signals (externally) An STM-1 signal processor for receiving and processing AU-3) and converting the signal into a parallel synchronous transport module signal (STM-1) to the serial / parallel converter; An external device connection unit for connecting a predetermined external device and the STM-1 signal processing unit to a predetermined section overhead data or control signal; A status display unit which displays predetermined status information; A clock processor for supplying a predetermined clock signal to the optical connector, the serial / parallel converter, and the STM-1 signal processor; And a power supply unit for supplying predetermined power to the optical connection unit, the serial / parallel conversion unit, the STM-1 signal processing unit, the external device connection unit, the clock processing unit, and the status display unit.

At this time, the serial / parallel conversion unit returns the serial synchronous transport module signal STM-1 inputted from the optical connection unit back to the optical connection unit according to a predetermined loopback control signal, or is input from the STM-1 signal processing unit. The apparatus may further include a loopback function for returning the parallel synchronous transport module signal STM-1 back to the STM-1 signal processor.

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

2 is a structural diagram of mapping a DS1 signal to an STM-1 signal;

3 is a block diagram of the present invention.

* Explanation of symbols for main parts of the drawings

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

12: optical path 310: optical connection

320: serial / parallel converter 330: STM-1 signal processor

340: external device connection 341: MCU connection

342: mashing wire connection 343: DCC connection

344: serial overhead connection unit 350: clock processing unit

360: power supply unit 370: status display unit

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

3 is a block diagram of the optical transceiver 300 in the optical subscriber transmission apparatus according to the present invention, the optical connector 310, the serial / parallel converter 320, the STM-1 signal processor 330, the external The device connection unit 340, the clock processing unit 350, the power supply unit 360, and the status display unit 370 are provided.

The power supply unit 360 receives a predetermined power supply (-48 volts) from the outside, ie, each component of the present invention, that is, the optical connector 310, the serial / parallel converter 320, the STM-1 signal processor 330, and the external device. The power supply for the operation of the device connection unit 340, the clock processing unit 350, and the state display unit 370 is supplied.

The status display unit 370 receives and displays a predetermined status signal for the optical transceiver 300 according to the present invention, so that the user can easily know the current status. As an exemplary embodiment of the status display unit 370, a light emitting diode (LED) may be used.

According to an embodiment, when a state such as a loss of signal (LOS), a loss of frame (LOF), an alarm indication signal (AIS), or the like occurs in a signal input / output to the optical transceiver 300 The LED is to be turned on.

The clock processor 350 receives and processes a predetermined main clock signal (51.84Mhz and 8 / 2Khz) from the outside to supply clock signals for use by each component of the optical transceiver.

The optical connector 310 performs a function of connecting with the optical path 12.

That is, in the reception process, a serial synchronous transport module signal (STM-1: 155.52 Mbps) in the form of an optical signal is received from the optical path 12, and the serial synchronous transport module signal (STM-1: 155.52 Mbps) in the form of an electrical signal is received. ) To output to the serial / parallel conversion unit 320.

In the transmission process, the serial synchronous transport module signal STM-1: 155.52 Mbps in the form of an electrical signal is received from the serial / parallel converter 320 and converted into a serial synchronous transport module signal STM-1 in the form of an optical signal. The light is output to the corresponding optical path 12.

The serial / parallel converter 320 is positioned between the optical connection unit 310 and the STM-1 signal processor 330 to convert the serial synchronous transport module signal STM-1 into a parallel synchronous transport module signal STM-1. Or converts the parallel synchronous transport module signal STM-1 into a serial synchronous transport module signal STM-1.

In detail, when receiving, the STM-1 signal processor converts the serial synchronous transport module signal 190 (STM-1) of the electrical type output from the optical connection unit 310 into an 8-bit parallel signal. Output to (330). At the time of transmission, the 8-bit parallel synchronous transport module signal STM-1 is received from the STM-1 signal processor 330 and converted into a serial synchronous transport module signal STM-1, and output to the optical connection unit 310. .

Meanwhile, the serial / parallel converter 320 performs a loopback function of the local loopback function and the remote loopback function.

That is, according to the loopback control signal sent from the predetermined main control unit through the MCU connection unit 340, the serial synchronous transport module signal STM-1 input from the optical connection unit 310 is returned to the optical connection unit 310 again. A local loopback function and a remote loopback function of returning an 8-bit parallel synchronous transport module signal STM-1 input from the STM-1 signal processor 330 back to the STM-1 signal processor 330.

The STM-1 signal processor 330 will now be described.

At the time of reception, the STM-1 signal processor 330 receives the 8-bit parallel synchronous transport module signal STM-1 received from the serial / parallel converter 320 and includes it in the signal after descrambling. The section overhead 191 is extracted. Then, the section overhead 191 is extracted, and the management unit signal pointer (AU-3 pointer) information is analyzed to extract each management unit signal 170 (AU-3), and then aligned with a predetermined transmission clock for output. do.

At this time, the maintenance / maintenance function performed on the received synchronous transport module signal 190: STM-1 is as follows.

When a signal loss (LOS) condition or a frame loss (LOF) condition is detected, an alarm indication signal (AIS) is generated downward, and a far end receive failure (FERF) condition is generated. In addition, it reports to the predetermined main control device through the MCU connection unit 340 of the external device connection unit 340.

If an out of frame (OOF) state, a bit teaching parity (B1 or B2) error state is detected, or a far end block error (FEBE) state is received, the MCU connection unit 340 is accumulated. Report to the main control via.

Bit teaching parity (B1 or B2) exceeds a predetermined threshold (e.g. 10E-4), multiplexer section far-end failure (MS-FERF: Multiplex Section FERF), path switching bytes (K1 and K2) If an automatic protection switching (APS) state, or S1 byte is detected, the controller reports this to the main controller through the MCU connection unit 340.

On the other hand, during transmission, the STM-1 signal processing unit 330 first receives three management unit signals 170 (AU-3) from the outside, and generates and inserts the management unit signal pointer 171 according to the management unit. The group signal 180 (AUG) is formed. In addition, the section overhead 191 is multiplexed on the formed management unit group signal 180 (AUG) to form a synchronous transport module signal 190 (STM-1), followed by scrambling and serialization in the form of a parallel signal. / Parallel to the conversion unit (320).

At this time, for the synchronous transport module signal 190 (STM-1) to be transmitted, the path switching byte (K1, K2), S1 byte, far-end reception failure (FERF) data from the main control unit through the MCU connection 341, And receiving and inserting the multiplexer section alert indication signal (MS-AIS) data, and generating and inserting bit shift parity bytes B1 and B2 by themselves.

That is, the STM-1 signal processing unit 330 converts the synchronous transport module signal STM-1 and the three management unit signals AU-3 in parallel to each other. The corresponding information from the device is received through the external device connection unit 340.

The external device connection unit 340 serves to interface the optical transceiver 300 and a predetermined external device with each other according to the present invention, and includes an MCU connection unit 341, a short circuit connection unit 342, and a DCC connection unit. 343, and a serial overhead connection 344.

The MCU connection unit 341 is connected to a predetermined main control unit (MCU) and transmits each control signal transmitted from the main control unit to the STM-1 signal processing unit 330, or the STM-1 signal processing unit 330. To send signals to the main controller to report to the main controller.

The mating line connecting unit 342 is connected to a predetermined mating line to transmit and receive the batting line information, that is, the batting line bytes E1 and E2 among the section overhead 191 information.

The DCC connection unit 343 is connected to a predetermined data communication channel (DCC) unit to transmit and receive data channel information (D1 to D12 bytes) for operation and maintenance.

The serial overhead connection unit 344 serially connects predetermined serial overheads to the STM-1 signal processing unit 330 or vice versa.

As described above, the present invention is used in a communication device connected to each other by the optical path 12, such as the optical subscriber transmission device (10, 11) and performing a communication by a synchronous transmission method, the management unit signal 170 : AU-3 to make the synchronous transport module signal 190: STM-1 and transmit it to the optical path 12, or receive the synchronous transport module signal 190: STM-1 from the optical path 12 and manage the unit A function of outputting the signal 170: AU-3.

Therefore, the optical subscriber transmission apparatuses 10 and 11 and the optical path 12 may be connected to each other, and may be used where signal processing of a management unit signal 170 (AU-3) is to be performed.

Claims (2)

Used in a predetermined optical subscriber transmission device, the management unit signal (AU-3) is made into the synchronous transport module signal (STM-1) and transmitted to the optical path, or the synchronous transport module signal is received from the optical path and output in the management unit signal unit. An apparatus comprising: an optical connection portion connected to the optical path and performing a conversion function between a serial synchronous transport module signal in the form of an optical signal and a serial synchronous transport module signal in the form of an electrical signal; A serial / parallel converter configured to receive a serial synchronous transport module signal in the form of an electrical signal from the optical connector and convert it in parallel, or to receive and convert a predetermined parallel synchronous transport module signal in series and then output the serial synchronous transport module signal to the optical connector; The parallel synchronous transport module signal output from the serial / parallel conversion unit is processed and output in a management unit signal unit aligned to a predetermined transmission clock, or a predetermined number of management unit signals are received from the outside and processed to receive a parallel synchronous transport module signal. An STM-1 signal processor configured to send the serial / parallel converter to the serial / parallel converter; An external device connection unit for connecting a predetermined external device and the STM-1 signal processing unit to a predetermined section overhead data or control signal; A status display unit which displays predetermined status information; A clock processor for supplying a predetermined clock signal to the optical connector, the serial / parallel converter, and the STM-1 signal processor; And And a power supply unit for supplying predetermined power to the optical connection unit, serial / parallel conversion unit, STM-1 signal processing unit, external device connection unit, clock processing unit, and status display unit. Device. The method according to claim 1, wherein the serial / parallel conversion unit returns the serial synchronous transport module signal inputted from the optical connection unit back to the optical connection unit according to a predetermined loopback control signal, And a loopback function for returning the parallel synchronous transport module signal input from the STM-1 signal processor back to the STM-1 signal processor.