KR100284001B1 - Time slot switching device for control unit signal and control unit signal in optical subscriber transmission device - Google Patents

Abstract

The present invention relates to a time slot switching device for a hierarchy unit signal and a management unit signal in an optical subscriber transmission device.

The present invention includes a clock selection and monitoring unit for receiving a predetermined clock signal and selecting and outputting a normal clock signal, a main control device connection unit for connecting to a main control device to exchange predetermined switching control information, and a predetermined management unit signal from the outside. An input parity check and generation unit for receiving the AU-3 and the parity bit to check whether the data is damaged, and generating and outputting the parity bit again, and the payload data of the predetermined management unit signal (AU-3); After receiving the parity bit and storing it according to the predetermined data write address, the data memory unit reads and outputs the data according to the predetermined data read address, and receives and stores predetermined switching control information from the main control device. Control memory unit provided to the memory unit, payload data and parity bits of the external management unit signal (AU-3) It receives the data write address and sends it to the data memory unit along with the data write address, and checks whether the memory control unit supplies the control data read address to the control memory unit, and whether the switched data outputted from the data memory unit is damaged and generates a new parity bit. An output parity check and generation unit outputs the switched data and the generated parity bits.

Description

A time slot switching unit for Tributary Unit signals and Administrative Unit signals in Fiber Loop Carrier systems

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a time slot switching device for a control unit signal and a control unit signal in an optical subscriber transmission device. In particular, the optical connection is used in an optical subscriber transmission device so that a cross connection of a level of a tributary unit (TU) level is used. The present invention relates to an apparatus for performing a time slot switching function for each level unit signal.

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, as described above, the management unit signal (AU-3) appears in the multiplexing procedure or demultiplexing procedure in the optical subscriber transmission apparatus using the synchronous transmission method, DS1 class in the management unit signal (AU-3) The hierarchy unit signal TU-11 for the subscriber signal is multiplexed or the hierarchy unit signal TU-12 for the DS1E class subscriber signal is multiplexed. Hereinafter, for convenience of description, the hierarchy unit signal TU-11 to which the DS1 signal is mapped is converted into the first hierarchy unit signal, and the hierarchy unit signal TU-12 to which the DS1E signal is mapped to the second hierarchy unit signal. We will use it by definition.

At this time, in order to link with other optical subscriber transmitters constituting the optical subscriber network, time at each level unit signal (TU-11, TU-12) level is input to a plurality of management unit signals (AU-3). There is a need for an apparatus that performs slot switching. That is, there is a need to replace any level unit signal constituting the management unit signal AU-3 with a new level unit signal.

Accordingly, the present invention has been made to meet the above needs, and is used in a predetermined optical subscriber transmission device using a synchronous transmission method, and each level unit signal (TU-3) with respect to an input management unit signal (AU-3). It is an object of the present invention to provide an apparatus for performing time slot switching at a level of -11, TU-12), that is, a time slot switching apparatus for a hierarchy unit signal and a management unit signal in an optical subscriber transmitter.

In order to achieve the above object, in the optical subscriber transmission device according to the present invention, the time slot switching device for the hierarchy unit signal and the management unit signal receives a predetermined clock signal and selects a normal clock signal and outputs a clock selection. And a monitoring unit; A main control unit connection unit connected to the main control unit to exchange predetermined switching control information; An input parity check and generation unit that receives a predetermined management unit signal (AU-3) and a parity bit from an external source, checks whether the payload data is damaged, and generates and outputs a parity bit again; A data memory unit configured to receive payload data and parity bits of a predetermined management unit signal (AU-3), store them according to a predetermined data write address, and then read and output the corresponding data according to a predetermined data read address; A control memory unit for receiving and storing predetermined switching control information from the main controller and outputting the data read address to the data memory unit according to the switching control information at a predetermined control memory read address; The payload data and the parity bit of the external management unit signal (AU-3) are received and transmitted to the data memory unit together with the data write address, the control data read address is supplied to the control memory unit, and a predetermined switching control is provided. A memory control unit for transmitting information to the control memory unit; And receiving the switched data and the parity bits outputted from the data memory unit, and the parity bits outputted from the input parity check and generation unit, inspecting whether the payload data is damaged and generating new parity bits. And an output parity check and generation unit configured to output the switched data and the generated parity bits.

At this time, the memory controller generates a data write address for sequentially storing payload data of the external management unit signal (AU-3) and supplies the data write address to the data memory unit, and supplies the control data read address to the control memory unit. An address generator which generates and outputs a message; When the power supply or the main control device is reset, the payload data is passed through as it is, and time slot switching for the management unit signal AU-3 and management unit signal AU-3 group path switching ( In the case of Group Path Switching), a control memory data generation unit generating predetermined switching control information and transmitting the predetermined switching control information to the control memory unit so as to perform corresponding switching; And receiving the payload data and the parity bit of the external management unit signal (AU-3), performing parity bit error checking, generating a new parity bit, and converting the payload data and the generated parity bit into the data memory. The payload data connection unit to be sent to the unit can be configured to be implemented more preferably.

Further, the payload data connection unit receives predetermined test pattern data, input / output time slot number, and number of input / output management unit signal (AU-3) from the main control unit to test the payload switching function. Preferably, the test pattern data is loaded into an input time slot to be tested and sent to the data memory unit, and the test pattern data is extracted from the output time slot and sent to the main control device. can do.

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

2 is a mapping structure diagram of a synchronous transport module signal STM-1 to a DS1 signal;

3 is a block diagram of a time slot switching apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

300: time slot switching apparatus of the present invention

310: main control unit connection 320: clock selection and monitoring unit

330: input parity check and generation unit 340: data memory unit

341: first memory 342: second memory

350: control memory unit 360: memory control unit

361: address generator 363: control memory data generator

362: payload data connection unit 370: output parity check and generation unit

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

3 is a block diagram of a time slot switching device 300 for a hierarchy unit signal and a management unit signal in the optical subscriber transmission device according to the present invention, wherein the main controller connection unit 310, the clock selection and monitoring unit 320 are shown. And an input parity check and generation unit 330, a data memory unit 340, a control memory unit 350, a memory control unit 360, and an output parity check and generation unit 370.

The present invention relates to 8-bit parallel data (HW.0, HW.1) of 25.92 Mbps transmission rate by time-division multiplexing four management unit signals (AU-3) with pointers aligned at the level of a tributary unit (TU). , HW.2: hereinafter referred to as highway data.) An arbitrary time slot is received according to the configuration information received from the three main clock signals and received from the main control unit 410. After switching to, it transmits three highway data at 25.92Mbps and a frame clock.

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

The clock selection and monitoring unit 320 receives a plurality of main clock signals from a predetermined external clock unit 420, detects an error state of an input clock, and connects the main controller device 310 from the main controller 410. According to the clock mode signal (clock auto selection prohibition or clock auto selection) sent through), the corresponding clock is selected and output.

The main clock signal is a frame clock of 8KHz (one management unit signal is 125 μs 8000 frames appear in one second) and 51.84 MHz clock for data processing of the management unit signal. At this time, when the clock automatic selection prohibition signal is input, the main control unit 410 selects the selected clock. When the clock automatic selection signal is input, the state of each clock is checked to automatically select a normal clock.

The main control unit connecting unit 310 is connected to the main control unit 410, so that the predetermined switching control information and switching pattern data can be exchanged between the time switching device 300 and the main control unit 410 of the present invention. do.

Since serial communication with the main control unit 410 is performed, a serial / parallel data conversion function is performed between the main control unit 410 and the time slot switching device 300 of the present invention. In addition, it includes registers for storing the state information generated in the time slot switching device 300 and can be read by the main control device (410).

In this case, examples of the configuration information input from the main control device 410 include test pattern data, an input / output time slot number, and an input / output highway number for determining whether the switching operation is normally performed.

The input parity check and generation unit 330 receives 8 bits of highway data (25.92 Mbps parallel data) and even parity 1 bit and checks the parity bit to check whether the received data is damaged. In addition, in order to allow the output parity check and generation unit 370 to check a corruption state of data that may occur during time slot switching, an even parity is newly generated and then output.

The data switching operation includes a data memory unit 340 for storing payload data and a control memory unit for outputting a data read address for reading payload data stored in the data memory unit 340 according to predetermined switching information. And a memory for generating a write address for writing data to the data memory unit 340 and a control data read address for the control memory unit 350, and performing a connection test and switching test function of the payload data input and output. It is performed by the controller 360.

The memory controller 360 includes an address generator 361, a payload data connector 362, and a control memory data generator 363.

The address generator 361 determines whether the payload data input to the data memory unit 340 is the first hierarchy unit signal (TU-11) type data or the second hierarchy unit signal (TU-12) type data. After that, a data write address for sequentially storing the payload data is generated and output to the data memory unit 340. In addition, in order to read the time slot-switched data in accordance with the output time slot, the control data read address for reading the control data from the control memory 350 is generated and output to the control memory 350.

The payload data connection unit 362 receives three highway data and three even parity bits input to the input parity check and generation unit 330, detects errors in the received highway data by checking parity bits, and even parity. The bit is generated and sent to the data memory unit 340 together with the payload of the highway data.

In addition, the 8-bit switching data and 1-bit even parity switched from the data memory unit 340 are received to detect a parity error, and after generating the even parity bit again, the 8-bit switching data is output to the outside.

In order to test the payload switching function, after receiving 8-bit test pattern data, input / output time slot number, and input / output highway number from the main controller 410, an input time slot for testing the received test pattern data. The data is sent to the data memory unit 340, and the test pattern data is extracted from the output time slot and sent to the main controller 410.

On the other hand, the control memory data generator 363 is a charge for the highway data input when the predetermined power or the main control unit 410 for supplying power to the time slot switching device 300 according to the present invention is reset. Switching information that allows the load data to pass through as it is, or in the case of switching of the management unit signal (AU-3) level and group path switching of the management unit signal (AU-3) group level Generates the switching information for the transmission to the control memory unit 350.

The data memory unit 340 may include a first memory 341 for storing the first level unit signal (TU-11) type data and a second memory for storing the second level unit signal (TU-12) type data ( 342).

The data memory unit 340 stores the highway data input from the payload data connection unit 362 according to the sequentially increasing data write address provided from the address generator 361 of the memory controller 360. ) And the second memory 342 are sequentially stored. At this time, the first memory 341 and the second memory 342 are allocated to each of the three highway data, so that each highway data is written to the corresponding data memory.

The data written to the data memory unit 340 is read from the data memory space according to the switching information output from the control memory unit 350 and then loaded into the corresponding time slot.

At this time, the first memory 341 is 9. × It consists of two 32-port, four-port (write 1, read 3) RAMs, which comprise two pages to prevent data loss during switching. Each page can store the minimum repetitive frame of the TU-11 type data, and in the data writing operation, each data is alternately stored in two pages.

On the other hand, the second memory 342 is 9 × It consists of three 21-port, four-port (write 1, read 3) RAM. Three RAMs constitute three pages to prevent data corruption that may occur during switching. Each page can store the minimum repetitive frame of the second level unit signal (TU-12) type data.In the data write operation, each data is stored sequentially in three pages, and is always written during reading. Read a page that is different from the page.

The control memory unit 350 controls the first memory 341. × 3 ports of 128 size (write 1, read 2) 11 to control RAM and second memory 342 × It consists of three 84-port, two-port (write 1, read 1) RAM.

In this case, one write port and one read port are connected to the main controller 410 through the main controller connecting unit 310. The other read port is connected to the first level unit signal (TU-11) type control data read address or the second level unit signal (TU-11) type control data read address inputted from the address generator 361. The switching control information corresponding to the control data read address sent from the address generator 361 is output to the data memory unit 340.

On the other hand, the data stored in the control memory unit 350 is configured in units of 15 bits, and specifies the source (source) of the payload data for switching.

Specifically, bits 14 and 13 are bits that are not used, and bits 12 and 11 are used to specify the type of payload. At this time, if the logic value of bit 12 and bit 11 is ″ 0 ″, the first level unit signal (TU-11) type data; if ″ 1 ″, the second level unit signal (TU-12) type data, and if ″ 10 ″ Management unit signal AU-3, " 11 " means management unit signal AU-3 group path switching.

In addition, bit 10 represents an output enable, and bit 9 is used as an idle code so that '0' inserts payload data and '1' inserts an idle code. Bits 8 and 7 represent the numbers 0 through 2 of the highway data, and bits 6 and 5 represent the numbers 0 through 3 of the management unit signal AU-3.

On the other hand, for bits 4 to 0, if the corresponding decimal value is 0 to 27, the number of the management unit group signal (TUG) and the number of the hierarchy unit signal (TU) (the upper 3 bits are the TUG numbers from 0 to 6, the lower one). Two bits are the TU number from 0 to 3), 28 is the high virtual box (VC-3) path overhead or fixed overhead, 29 is the first management unit pointer (H1), and 30 is the second management unit pointer (H2). ), It is assumed that 31 indicates the third management unit pointer H3.

At this time, bits 4 to 0 are not used when switching the management unit signal (AU-3) level, and only bits 12, 11, and 7 are valid when switching the management unit signal (AU-3) group path. Do.

The destination address consists of 9 bits and specifies the location of the payload to be switched.

Specifically, bits 8 and 7 represent numbers of highway data (0 to 2), and bits 6 and 5 represent numbers of management unit signals (0 to 3).

For bit 4 to bit 0, if the corresponding decimal value is 0 to 27, the number of the hierarchy unit group signal (TUG) and the number of the hierarchy unit signal (TU) (the upper 3 bits are TUG numbers from 0 to 6, the lower one). Bit 2 is a TU number from 0 to 3), 28 is the path overhead or fixed overhead of the high-level virtual box (VC-3), 29 is the first management unit pointer (H1), 30 is the second management unit pointer ( H2), 31 means that the third management unit pointer H3 is represented.

At this time, bits 4 to 0 are not used when switching the management unit signal AU-3, and only bits 7, bits 6, and 5 are valid when switching the management unit signal AU-3 group path.

Finally, the output parity check and generation unit 370 receives 8-bit parallel data output from the data memory unit 340 and even parity bits generated by the input parity check and generation unit 330, and checks the parity bits. Check the data corruption that occurred during time slot switching. A new even parity bit is generated and output together with the highway data.

As described above, the present invention can be used in the optical subscriber transmission device to perform the time slot switching function of the hierarchy unit signal level with respect to the management unit signal (AU-3), so that the optical subscriber transmitters can interoperate with each other. It is effective.

Claims (3)

A device which is used in a predetermined optical subscriber transmission device using a synchronous transmission method, performs a time slot switching function for a management unit signal (AU-3) under the control of a predetermined main control device. A clock selector and monitor configured to receive the clock signals and select and output a normal clock signal; A main control unit connection unit connected to the main control unit to exchange predetermined switching control information; An input parity check and generation unit that receives a predetermined management unit signal (AU-3) and a parity bit from an external source, checks whether the payload data is damaged, and generates and outputs a parity bit again; A data memory unit configured to receive payload data and parity bits of a predetermined management unit signal (AU-3), store them according to a predetermined data write address, and then read and output the corresponding data according to a predetermined data read address; A control memory unit for receiving and storing predetermined switching control information from the main controller and outputting the data read address to the data memory unit according to the switching control information at a predetermined control memory read address; The payload data and the parity bit of the external management unit signal (AU-3) are received and transmitted to the data memory unit together with the data write address, the control data read address is supplied to the control memory unit, and a predetermined switching control is provided. A memory control unit for transmitting information to the control memory unit; And After receiving the switched data and parity bits outputted from the data memory unit, and the parity bits outputted from the input parity check and generation unit, checking whether the payload data is damaged and generating new parity bits, And an output parity check and generation unit for outputting the switched data and the generated parity bits. The data storage unit of claim 1, wherein the memory controller generates a data write address for sequentially storing payload data of the external management unit signal AU-3 and supplies the data write address to the data memory unit. An address generator which generates and outputs a data read address; When the power supply or the main control device is reset, the payload data is passed through as it is, and time slot switching for the management unit signal AU-3 and management unit signal AU-3 group path switching ( In the case of Group Path Switching), a control memory data generation unit generating predetermined switching control information and transmitting the predetermined switching control information to the control memory unit so as to perform corresponding switching; And After receiving the payload data and the parity bit of the external management unit signal (AU-3), performing parity bit error check and generating a new parity bit, and transferring the payload data and the generated parity bit to the data memory unit. A time slot switching device for a hierarchy unit signal and a management unit signal in the optical subscriber transmission device, characterized in that it comprises a payload data connection for sending. 3. The payload data connection unit of claim 2, wherein the payload data connection unit receives predetermined test pattern data, input / output time slot numbers, and numbers of input / output management unit signals (AU-3) from the main control unit to test the payload switching function. After receiving, the test pattern data is loaded into an input time slot to be tested and transmitted to the data memory unit, and further includes a function of extracting test pattern data from the output time slot and sending the test pattern data to the main controller. A time slot switching device for a hierarchy unit signal and a management unit signal in an optical subscriber transmission apparatus.