KR100284010B1 - Time slot switching device in optical subscriber transmitter for ring network coupling - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time slot switching device in an optical subscriber transmission device for ring network coupling. In particular, the present invention relates to an optical subscriber transmission device for connecting a ring network and a ring network. An apparatus for performing a switching function at a (TU-11, TU-12) level.

The present invention receives the management unit signals processed by the optical transceiver and optical subscriber transmitter itself, which are optically connected to each ring network, respectively, at the level of the hierarchy unit signal (TU-11 or TU-12) or the management unit signal level. A pointer processing unit for sorting and outputting pointers or receiving a predetermined switched management unit signal and outputting the same to a corresponding device; and a time slot according to configuration information received from an external receiving and receiving management unit signals for sorting and outputting pointers at the pointer processing unit After switching, the switching unit transmits the switched management unit signal to the pointer processing unit.

Using the present invention, since the network operation using the optical subscriber transmission device can be operated in the form of a mixture of two networks in the existing single network form, there is an effect that the efficiency of network operation and network management is increased.

Description

A time slot switching unit to connect a network of ring type with another network of ring type in Fiber Loop Carrier systems

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time slot switching device in an optical subscriber transmitter for ring network coupling, and in particular, an optical subscriber transmitter for connecting two optical subscriber networks composed of a ring type to each other (Fiber Loop Carrier system). The present invention relates to an apparatus for performing a switching function at an administrative unit signal (AU-3) and a hierarchy unit signal (TU-11, TU-12) level.

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 master station 10: COT and the remote station 11: RT is performed using the synchronous transmission method. In the synchronous transmission method, each signal is synchronized with the synchronous digital hierarchy (SDH). After multiplexing along the path according to the).

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 VC-11: 130, it becomes a level unit signal TU-11: 140, 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 (TU-11: 140) 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 (VC-3: 160) is generated. When the pointer 171 is added to the 160, a management unit signal (AU-3: 170) 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 STM-1: 190 is finally generated.

As described above, the DS1 signal 110 input to the optical subscriber transmission apparatus using the synchronous transmission method is made into the synchronous transport module signal (STM-1: 190) after each multiplexing process, and then the optical path 12 is opened. Is sent through.

FIG. 3 shows the shape of the optical subscriber network, FIG. 3A shows the shape of a linear type network, FIG. 3B shows the shape of a hubbing network, and FIG. 3C shows the shape of a ring type network. .

In FIG. 3A, a main network 310 (COT) and a plurality of remote stations 311 and 312: RT are linearly connected, and are located between the main station 310 (COT) and the far end remote station 312: RT. The remote station 311 (RT) drops the signal to be transmitted to the subscriber connected to it from the synchronous transport module signal (STM-1) received by the remote station, or the subscriber connected to the signal to be passed without being dropped. Add signals to be transmitted from the side to the other side (Add) to make a synchronous transport module signal (STM-1) and transmit again.

In FIG. 3B, the hub network is connected to the plurality of remote stations 322 and 323 RT through the remote station 321 RT connected to the main station 320 COT, respectively, and ends with the main station 310 COT. In the remote station 321: RT connecting the remote stations 322 and 323: Add / Drop function as in the linear network is performed.

3C is a diagram of a ring network, in which a main station 330 (COT) and a plurality of remote stations 331 to 333: RT are connected in a ring form, and in each of the remote stations 331 to 333: RT, the above is added. Add / Drop function is performed. At this time, the ring-shaped line is doubled and transmits and receives the same signal to the east and the west.

On the other hand, in the related art, each of these linear, ring-type, and hub-type networks is operated in a single form, respectively, and since two networks cannot be operated simultaneously, there is no connection between the network and the network. There was a problem that was not efficient.

Accordingly, the present invention has been made to solve the above problems, the management unit signal (AU-3) from the synchronous transport module signal (STM-1) received from the optical fiber by connecting to the ring-shaped first optical subscriber network through the optical fiber Is connected to the first optical transceiver, the ring-shaped second optical subscriber network, which performs the reverse function, or performs the reverse function, and separates the management unit signal from the synchronous transport module signal (STM-1) received from the optical path. A second optical transceiver for outputting or performing a reverse function, a management unit signal forming device for receiving and outputting a DS1 level signal or a DS1E level signal from a subscriber side as a management unit signal, and outputting or performing the reverse function; and a DS3 level from a subscriber side It comprises a second signal connection device that receives the signal to generate and output the management unit signal or perform the reverse function, two It is used in the optical subscriber transmission device that can connect the ring-shaped networks of each other, and provides an apparatus for performing the time slot switching function at the management unit signal (AU-3) and the hierarchy unit signal (TU-11, TU-12) levels. Its purpose is to.

In order to achieve the above object, the time slot switching device in the optical subscriber transmitter for ring network coupling according to the present invention is the first optical transceiver, the second optical transceiver, the management unit signal forming device, and the first 2 After receiving the corresponding management unit signal in one-to-one correspondence with each management unit signal output from the signal connection device, the pointers are output at the level of the hierarchy unit signal (TU-11 or TU-12) or the management unit signal level. Or a pointer processing unit which receives the switched management unit signal and outputs the same to the corresponding device; And a switching unit configured to receive the management unit signals output by arranging the pointers in the pointer processing unit and to switch the time slots according to configuration information received from the outside, and to transmit the switched management unit signals to the corresponding pointer processing units. It is done.

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 form of the optical subscriber network,

Figure 4 is a form in which the ring network and the ring network is coupled,

5 is a block diagram of an optical subscriber transmission device using a time slot switching device according to the present invention;

6 is a block diagram of a time slot switching device in an optical subscriber transmitter for ring network coupling 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 410: first ring optical subscriber network

420: second ring optical subscriber network

430: optical subscriber transmission device for connecting between the ring network

431,432,433,434: Optical Transceiver (OTRU)

435: time slot switch 436: main control unit (MCU)

437: management unit signal forming device 438: first signal connection device

439: second signal connection device 510: time slot switching device

521 to 531: pointer processing unit

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

FIG. 4 illustrates a ring network and a ring network in which the first ring optical subscriber network 410 and the second ring optical subscriber network 420 are connected to each other at one remote station 430 (RT). .

That is, the synchronous transport module signal STM-1 transmitted in both directions from the main station 310 (COT) is transmitted through the first ring-type optical subscriber network 410. At this time, the signals to be transmitted to the second ring-shaped optical subscriber network 420 are dropped from one of the remote stations 430 (RT) of one of the remote stations constituting the first ring-shaped optical subscriber network 410 and the second signal is dropped. Is transmitted to the ring-shaped light subscriber network 420. Of course, the dropped signal as a signal to be transmitted to subscribers connected to this remote station 430: RT is converted into a subscriber signal by a predetermined demultiplexing procedure and then transmitted to each subscriber.

FIG. 5 is a block diagram of an embodiment of an optical subscriber transmitter 430 using a time slot switching apparatus according to the present invention. Referring to this, FIG. 5 illustrates an optical subscriber transmitter 430 connecting a ring network and a ring network. The function will be described.

Four optical transceivers (431 to 434: Optical Transmit and Receive Units) are used for the optical subscriber transmission apparatus to which the present invention is applied, and two optical transceivers 431 and 432 are connected to the first ring optical subscriber network 410. The other two optical transceivers are connected to the second ring optical subscriber network 420. Two optical transceivers are used in one ring network because the ring network transmits the same signal in both east and west directions.

The optical transceivers 431 to 434 (OTRUs) receive the synchronous transport module signal STM-1 transmitted in the form of an optical signal by being connected to the optical path, and transmit the synchronous transport module signal STM-1 in the form of an electrical signal. After the conversion, the section overhead included in the synchronous transport module signal (STM-1) is separated and processed, and the three management unit signals (AU-3) are output in series and the reverse function. Device.

A signal separated from the optical transceivers 431 to 434: OTRUs is input to the time slot switching device 435 of the present invention to perform a time slot switching operation.

At this time, the time slot switching device 435 includes three serial management unit signals (AU-3) and second ring optical signals transmitted from the optical transceiver 431 or 432 connected with the first ring optical subscriber network 410. Three management unit signals (AU-3) transmitted from the optical transceiver device 433 or 434 connected to the subscriber network 420, three management unit signals (AU-3) transmitted from the management unit signal forming device 437 ) And two management unit signals (AU-3) transmitted from the second signal connection device 439, a total of eleven management unit signals (AU-3) are input.

The switching information used for switching in the time slot switching device 435 is received from the main controller 436 (MCU). The main controller 436 (MCU) is a device that is in charge of the overall control of the optical subscriber transmitter. It is a device to monitor and control the performance, operation status, and alarm status of subscriber transmission equipment. In other words, the time slot switching device 435 according to the configuration information sent from the main control unit 436 (MCU), the hierarchy unit signal (TU-11 or TU-12) or the management unit signal (AU-3) ) To perform the time switching function.

On the other hand, the DS1 signal or DS1E signal received from subscribers to the optical subscriber transmission device 430 is received by the first signal connection device 438, and then the management unit signal forming device 437 to the synchronous digital hierarchy (SDH) Accordingly, the signal is multiplexed to form the management unit signal AU-3 and then passed to the time slot switching device 435. In addition, the management unit signal AU-3, which is dropped from the time slot switching device 435 and input to the management unit signal forming device 437, is demultiplexed according to the synchronous digital hierarchy to make each DS1 signal or DS1E signal, Is sent to subscribers.

The second signal connection device is connected to the subscriber through a DS3-class signal, multiplexes the DS3-class signal received from the subscriber side according to the synchronous digital hierarchy to form a management unit signal (AU-3), and then the time slot switching device 435. As a device for performing the reverse process or the reverse process, the two management unit signals (AU-3) are exchanged with the time slot switching device 435 by connecting two DS3-class signals.

In the subscriber subscriber transmission device 430 having such a configuration, the time slot switching device 435 receives eleven management unit signals (AU-3), and the hierarchy unit signal (TU-11 or TU-12) or the management unit signal. After switching at the (AU-3) level, it sends a function to the device.

FIG. 6 is a block diagram of a time slot switching device 435 in the optical subscriber transmission device for ring network coupling according to the present invention, and includes eleven pointer processing units 521 to 531 and a switching unit 510.

At this time, each of the pointer processing units 521 to 531 is an element that processes one management unit signal AU-3, and is an optical transceiver 431 or 432 connected to the first ring-type optical subscriber network 410. Three management unit signals (AU-3) transmitted from the control unit, three management unit signals (AU-3) transmitted from the optical transceiver device 433 or 434 connected to the second ring-type optical subscriber network 420, and the management unit One in one-to-one correspondence with one of three management unit signals AU-3 transmitted from the signal forming apparatus 437 and two management unit signals AU-3 transmitted from the second signal connection device 439. Process the management unit signal (AU-3).

That is, one pointer processing unit demultiplexes the management unit signal (AU-3) received by the controller unit signal according to the synchronous digital hierarchy, and separates the system unit signal of the optical subscriber transmitter 430 using the system clock of the optical subscriber transmitter 430. Align the pointers. Then, the signal is multiplexed according to the synchronous digital hierarchy, and made into a management unit signal AU-3, and outputted to the switching unit 510.

The reason for such a pointer alignment is that the level unit signal TU-11 or TU-12 included in the management unit signal AU-3 of the synchronous transport module signal STM-1 received from different optical subscriber transmitters. Since they are aligned using different system clocks, they must be realigned to a single clock (the clock of the system that performs the switching function) to exchange them.

In addition, the pointer processing unit serially transmits the management unit signal (AU-3) transmitted through time slot switching from the switching unit 510 to the corresponding optical transceiver, the management unit signal forming apparatus, or the second signal connection device 439. This allows the management unit signal (AU-3) with the pointer aligned and the time slot exchanged to be sent to its destination.

The switching unit 510 receives the management unit signal (AU-3) sent from each of the eleven pointer processors 521 to 531 and performs time slot switching using the configuration information received from the main control unit 436 (MCU). Then transfer to the pointer processing unit.

Specifically, the optical transmission / reception apparatus 431 or 432 connected to the first ring-type optical subscriber network 410 to transmit signals to the first ring-type optical subscriber network 410 among the 11 management unit signals AU-3 input. The control unit signal (AU-3) to be transmitted to the management unit signal (AU-3) to be sent to the pointer processing unit corresponding to the control unit and the management unit signal forming apparatus (437) It transmits by switching to the management unit signal (AU-3) to be sent to the corresponding pointer processing unit.

In addition, the management unit signal (AU-3) to be sent to the second signal connection device 439 is switched to transmit to the management unit signal (AU-3) to be sent to the pointer processing unit corresponding to the second signal connection device (439).

Network operation using the optical subscriber transmission device can be operated in the form of a mixture of two networks in the existing single network form, thereby increasing the efficiency of network operation and network management.

Claims (1)

A first optical transceiver for connecting to a ring-shaped first optical subscriber network through an optical path and separating and outputting a management unit signal (AU-3) from the synchronous transport module signal (STM-1) received from the optical path or performing the reverse function thereof. A second optical transmission / reception, which is connected to the ring-type second optical subscriber network through an optical path and separates and outputs a management unit signal (AU-3) from the synchronous transport module signal (STM-1) received from the optical path or performs the reverse function thereof. Management unit signal forming device which receives DS1 level signal or DS1E level signal from device, subscriber and generates and outputs it as management unit signal (AU-3) or performs the reverse function, and management unit signal receiving DS3 level signal from subscriber side It is used in the optical subscriber transmission device including the second signal connection device which generates and outputs (AU-3) or performs the reverse function thereof to perform a switching function for each management unit signal (AU-3). In the device to perform, One management unit signal (AU-3) corresponding to each of the management unit signals (AU-3) output from the first optical transceiver, the second optical transceiver, the management unit signal forming apparatus, and the second signal connection device, the corresponding management unit signal (AU) -3) After receiving the input, align the pointer at the level of the unit signal (TU-11 or TU-12) or the level of the management unit signal (AU-3), or receive the switched management unit signal (AU-3). A pointer processor for outputting to a first optical transceiver, a second optical transceiver, a management unit signal forming apparatus, or a second signal connection apparatus corresponding to the apparatus; And After receiving the management unit signals (AU-3) output by sorting the pointers by the pointer processing unit and switching time slots according to configuration information received from the outside, transmitting the switched management unit signals (AU-3) to the corresponding pointer processing unit. Time slot switching device in the optical subscriber transmission for ring-shaped network coupling, characterized in that it comprises a switching unit.