KR20000046391A - Optical transmission apparatus having separated transfer structure - Google Patents

Abstract

PURPOSE: An optical transmission apparatus having a separated transfer structure is provided to improve the flexibility of the transfer structure by separating the transfer structure of each of the units necessary to exchange time slots, multiplexing an administrative unit into a synchronous transport module. CONSTITUTION: An optical transmission apparatus having a separated transfer structure is composed of high speed units(210,220), branch/coupling units(230,240) and slave units(250,260). Each high speed unit(210,220), dividing one signal into two, sends them to the branch/coupling unit A(230) and the branch/coupling unit B(240). Each slave unit(250,260), dividing one signal into two, sends them to the high speed unit A(210) and the high speed unit B(220).

Description

Optical Transmission Equipment having working units and protection units separately

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission apparatus having a separate switching structure, and in particular, multiplexes an administrative unit signal (AU) appearing on a multiplex path according to a synchronous digital hierarchy into a synchronous transport module signal (STM). The present invention relates to an optical transmission apparatus that improves the flexibility of the switching structure by separating the switching structure of each unit required to exchange a time slot.

In general, a signal processing scheme in a synchronous optical transmission apparatus receives a management unit signal outputted from a subordinate unit and a subordinate unit which generates and outputs a signal transmitted from the subscriber side as a management unit signal (AU-3 or AU-4). A branch / combination unit (Add / Drop Unit) for switching and outputting a switched management unit signal, and a management unit signal outputted from the branch / combination unit are multiplexed into a synchronous transport module signal (STM) having a predetermined size and output to the optical path. It consists of a high speed part.

At this time, the subordinate part, the branch / coupling unit, and the high speed part are composed of a working unit and a protection unit, so that when a failure occurs in the operating unit, the protective unit performs its role instead. Consists of.

FIG. 1 is a switching structure diagram of a conventional optical transmission device, and illustrates a switching structure between a branch / coupling unit and a slave unit.

As shown in Fig. 1, since the conventional optical transmission device accommodates a 1 + 1 switching structure, it protects the slave unit in the backplane of the optical transmitter and the operation units 130 and 110 of the branch / combination unit that interfaces with the slave unit. Units 140 and 120 are shorted to each other.

Therefore, in this switching structure, it cannot be extended to one-to-N switching structure, and in the 2.5 Gigabit optical transmission device accommodating 48 management unit signals, 32 × As a result of the limitation of the extension to the STM-1 structure, there was a problem in that a device for performing each function must be used separately according to the network configuration.

Accordingly, the present invention has been made to solve the above problems, and the optical transmission device, that is to have a switching structure separated from each other, instead of having a switching structure of the operation unit and the protective unit short-circuited with each other It is an object of the present invention to provide an optical transmission device having a switching structure.

In order to achieve the above object, the optical transmission device having a separate switching structure according to the present invention k k sub-parts for outputting a signal transmitted from the subscriber side to the management unit signal (AU-3), the k A branch / combining unit which receives the management unit signal outputted from the subordinate part and switches time slots and outputs k switched management unit signals, and a synchronous transport module having k management unit signals output from the branch / combining unit having a predetermined size. An optical transmission device comprising a high speed unit multiplexed with a signal STM and output to a light path, wherein a protective slave unit (k + 1 th) replaces the function of this slave unit when a failure occurs in any one of the k subordinate units. ) And m branches / coupling units, wherein m branches / coupling units are all k and And the same management unit signals are respectively inputted from the unit, and any one of m branch / combination units can be selected or operated, and the selected branch / combination unit outputs from the k sub-units. Among the management unit signals, the management unit signal outputted from the slave unit in which the failure occurs is replaced with the management unit signal output from the protection slave unit to perform the time slot exchange function, and the n high-speed units The n high speed units may be configured to receive the same management unit signals from the m branch / combination units, respectively, and any one of the n high speed units may be selected to operate or all of the n high speed units may operate. It is characterized in that it is configured to.

1 is a diagram of a switching structure in a conventional optical transmission device,

2 is a schematic diagram of a switching structure in the optical transmission device according to the present invention;

3 is a detailed configuration diagram of a switching structure between the high speed part and the branch / coupling unit;

4 is a detailed configuration diagram of a switching structure between the branch / coupling unit and the subordinate part.

* Explanation of symbols for main parts of the drawings

210,220: High speed section 230,240: Branch / coupling unit

250,251,252,253,254,260: dependent

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

2 is a schematic diagram of a switching structure in the optical transmission apparatus according to the present invention, wherein the high speed parts 210 and 220, the branch / coupling units 230 and 240, and the subordinate parts 250 and 260 are all operating units A and protective units. It consists of (B).

In this structure, each of the high speed parts 210 and 220 has a signal separation function for separately sending one signal to the branch / combining unit A 210 and the branch / combining unit B 240, and the branch / combining unit A 230. ) And one of the signals received from the branch / combining unit B (240).

In addition, each branch / combining unit 230, 240 sends a signal separately to the high speed unit A 210 and the high speed unit B 220, and separates into a subordinate A 250 and a subordinate B 260. And a signal separation function for sending and selecting one of the signals received from the fast unit A 210 and the fast unit B 220 and the slave unit A 250 and the slave unit B 260.

Each of the subordinates 250 and 260 has a signal separation function for separately sending one signal to the branch / combining unit A 230 and the branch / combining unit B 240, and the branch / combination unit A 230 and the branch / combination unit. It has a function of selecting a signal received from the coupling unit B (240).

3 is a detailed configuration diagram of a switching structure between the high speed units 210 and 220 and the branch / coupling units 230 and 240 for processing 48 management unit signals, and the high speed units 210 and 220 and the branch / coupling units 230 and 240 are respectively shown in FIG. It consists of two A and B.

Here, the 48 management unit signals AU-3 output from the respective branch / combining units 230 and 240 are input to both the high speed unit A 210 and the high speed unit B 220. That is, the first management unit signal output from the branch / combining unit A 230 is input as the first management unit signal of the high speed unit A 210 and is also input as the first management unit signal of the high speed unit B 220. The first management unit signal output from the branch / combining unit B 240 is input as the first management unit signal of the high speed unit A 210 and the first management unit signal of the high speed unit B 220.

In this connection type, the second management unit signal to the 48th management unit signal output from the branch / combining unit A 230 are input as the second management unit signal to the 48th management unit signal of the high speed unit A 210 and at the same time, The second management unit signal inputted from the second management unit signal to the 48th management unit signal of the unit B 220 and output from the branch / combining unit B 240 is the high speed unit A 210. The second management unit signal of the second management unit to the 48 th management unit signal is input to the second control unit signal of the high-speed unit B (220) to the 48 th management unit signal.

Therefore, the high speed unit A 210 and the high speed unit B 220 receive two management unit signals as the first management unit signal to the forty-eighth management unit signal, and select one of the management unit signals and process the same. Done.

In addition, the management unit signal processing clock CLK and the frame pulse FP output from the respective branch / combining units 230 and 240 are also the high speed unit A 210 and the high speed unit B 220 as the management unit signal. Will be printed).

That is, even if only one of the high speed unit A 210 and the high speed unit B 220 is operated according to the operating state of the high speed units 210 and 220, the first management unit signal to the 48th management unit sent from the branch / combining units 230 and 240. All signals can be processed. In addition, if both the high speed unit A 210 and the high speed unit B 220 are operated, and the management unit signals transmitted from different branch / combining units 230 and 240 are selected and processed, respectively, Since the sub-B 220 operates independently, a total of 96 management unit signals 32 × STM-1) can be processed, thereby improving the performance of the optical transmission device.

Meanwhile, the branch / combination unit A 230 and the branch / combination unit B 240 also operate only one or both according to the operation state, thereby performing time slot exchange function for 96 management unit signals. I can do it.

4 is a detailed configuration diagram of a switching structure between branch / combining units 230 and 240 and slave units 251, 252, 253 and 254 for processing four management unit signals. It consists of a dog, and the subordinate parts 251, 252, 253, 254 have a one-to-four switching structure. That is, in the case where a failure occurs in any one of the four subordinate parts 251, 252, 253 and 254, the protective subordinate part 260 performs a function of the subordinate part instead.

Here, the management unit signal AU-3 output from each subordinate unit is input to both the branch / coupling unit A 230 and the branch / coupling unit B 240. That is, the first management unit signal output from the first subordinate unit 251 is input to the first management unit signal of the branch / combination unit A 230 and the first management unit signal of the branch / combination unit B 240 at the same time. Is entered.

The second management unit signal to the fourth management unit signal outputted from the second subordinate unit 252 to the fourth subordinate unit 254 in this connection form are the second management unit signals of the branch / combining unit A 230 to the first sub-unit. 4 is input as the management unit signal and is input as the second to fourth management unit signals of the branch / combining unit B 240.

At this time, the management unit signal output from the protection slave unit 260 is also input to both the branch / combination unit A 230 and the branch / combination unit B 240, and the management unit signal output from the protection subordinate unit 260. Is input to the multiplexer with each management unit signal input to each branch / combining unit (230,240), one of which is configured to be selected.

That is, when there is a slave unit in which a failure occurs at present, the management unit signal output from the protection slave unit 260 is selected and input instead of the management unit signal output and input from the slave unit. As an example, if a failure occurs in the third slave unit 253 and the protective slave unit 260 is performing the function of the third slave unit 253 instead, the branch / coupling unit A 230 may use the third multiplexer. The output signal of the protection slave unit 260 is selected at 231, and the output signal of the protection slave unit 260 is also selected by the third multiplexer 241 at the branch / coupling unit B 240.

At this time, the branch / coupling unit A 230 and the branch / coupling unit B 240 are selected and operated according to the operation state, thereby flexibly coping with the failure.

As described above, in the present invention, since the 1 + 1 transfer structure and the 1 N transfer structure are mixed, a more flexible transfer structure can be realized.

Claims (1)

K sub-units that make and transmit the signal transmitted from the subscriber side to the management unit signal (AU-3), and receive the management unit signals output from the k sub-units and time slot switch to output k switched management unit signals And a high speed unit configured to multiplex k management unit signals output from the branch / combining unit into a synchronous transport module signal (STM) having a predetermined size and output the same to a light path. If a failure occurs in any of the k subordinates, it is further provided with a protective subordinate (k + 1th) to take over the function of this subordinate, M branches / coupling units, all m branches / coupling units configured to receive the same management unit signals from the k subordinates and the protection subordinates, respectively, and any of m branches / combination units. The selected branch / combining unit is configured to operate one or all, and the selected branch / combining unit outputs the management unit signal outputted from the subordinate unit which has failed among the respective management unit signals outputted from the k subordinate units. It is configured to perform a time slot exchange function by receiving the management unit signal outputted from the N-S, and further comprising n high speed units, all of the n high speed units receive the same management unit signals from the m branch / combination units. Each input unit is configured to receive an input, and any one of the n high speed units may be selected to operate or all of the n high speed units may operate. The optical transmission device of the separated transfer structure being configured so as claimed.