JPH05300554A - Transmission line switching system - Google Patents

Abstract

PURPOSE:To assign a device control part to another control job by comparing the path ID of the stored switching side with the path ID of the switched side through a path ID comparing part. CONSTITUTION:A transmission line switching command (c) is sent to a device control part 303 from a transmission line network controller 1. The part 303 produces a path ID comparison command and instructs an interface receiving part 304 to transcribe the contents of a comparison path ID holding part 308 connected to a transmission line 11 to a reception path ID holding part 313 connected to a transmission line 12. Under such conditions, a path ID comparing part 314 autonomously and continuously performs the comparison until the same contents as those of the transcribed path ID are detected by a path ID detecting part 307 connected to the line 12 and then written in the part 308. When the coincidence of comparison is secured, a coincident answer is returned to the part 303. The part 303 produces a switch request signal to a cross connection switch part 305 to switch the line 11 to the line 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line switching system in a digital transmission device, and more particularly to a transmission line switching system for switching a signal input from an opposite device through a different route from one side to the other by external control. Regarding the scheme.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a cross-connect device 2 for switching a transmission line of this type has a device control unit 3 controlled by a transmission line network control device 1, an interface receiving unit 4, and a cross-connect. It is composed of a switch section 5 and an interface transmission section 6, of which the interface reception section 4 includes a path ID detection section 7 and a reception path ID.
It has a holding unit 8, a transmission path ID insertion unit 9, and a transmission path ID holding unit 10.

The conventional transmission line switching operation by the plurality of cross-connect devices 102, 202, 302 arranged on the transmission lines 11, 12 will be described with reference to FIG. Interface receiver 10 of cross-connect device 102
The signal input to 4 is given a unique path ID, is branched into two by the cross-connect switch 105, and is transmitted from the interface transmission unit 106 to different transmission lines 1 respectively.
It is sent to 1 and 12. Here, the cross-connect device 302 switches between a signal input via the transmission line 11 and a signal input from the transmission line 12 via the cross-connect device 202. That is, the path ID inserted by the cross-connect device 102 is set to the cross-connect device 30.
The interface IDs 304 respectively connected to the two transmission lines 11 and 12 are terminated, the path IDs detected by the path ID detector 307 are stored in the reception path ID holding unit 308, and the stored paths are stored. ID
Is sent to the device control unit 303 (d, e), the device control unit 303 compares the path IDs for coincidence (f). As a result, if a match is confirmed by the device control unit 303, a transmission line switching request signal g is sent to the cross connect switch 305 to cause cross connection,
I am trying to switch paths.

[0004]

In the conventional transmission path switching method, when comparing the path IDs stored in the reception path ID holding unit 308, the path ID of the switching destination reaches the cross-connect device 302. If not, the device control unit 303 compares the path ID of the switching source with
There is a problem that the reading of the path ID (d, e) from the reception path ID holding unit 308 and the comparison (f) of the read path ID must be repeatedly executed. That is, when switching the transmission path in the cross-connect device 302, while transmitting the branch command a from the transmission line network control device 1 to the cross-connect device 102,
Path setting command b for the cross-connect device 202
And a path switching command, that is, a transmission path switching command b, to the cross-connect device 302. In the cross-connect device 302, the interface IDs 304 respectively connected to the transmission paths 11 and 12 receive the path ID, and the received path ID holding section 308 receives the path ID.
To house. Then, the cross-connect devices 102, 20
Even if the cross-connect device 302 that receives the transmission path switching command c executes the path ID comparison command in the device control unit 303 before the execution of the commands a and b issued to the device 2 is completed, At this time, the cross-connect device 1 is stored in the reception path ID holding unit 308 corresponding to the transmission path 12.
The path ID branched and output at 02 may not arrive. In this case, the device control unit 303 needs to read the path ID signal (d, e) and compare (f) until the path ID arrives.

[0005]

In order to solve such a problem, the present invention provides a device control section for receiving a command from a transmission line network control device and a transmission line signal sent from an opposite device. In a cross-connect device for switching a transmission path, the interface reception section receiving according to the control of the control section, a cross-connect switch for cross-connecting, and an interface transmission section for sending a signal to the transmission path. A path ID detecting section for detecting a path ID from the received transmission path signal,
A receiving path ID holding unit that holds a path ID and a comparison path I
The D holding unit and the path ID comparing unit are provided.

[0006]

In the opposite device, the transmission path signal that is branched into two and arrives via different routes is received, and the received transmission path signal is the same signal due to the path ID uniquely given to the transmission path signal in the opposite device. When confirming that the transmission path is switched, the path ID of the switching source is stored in the comparison path ID holding unit of the switching destination, and the path ID comparison unit holds the path ID of the stored switching source and the reception path ID. The transmission path is switched by comparing with the path ID of the switching destination accommodated in the unit. As a result, the device control unit can switch the transmission path only by transmitting the path ID comparison command, and does not need to repeatedly read or compare the path ID from the reception path ID holding unit.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an apparatus to which the transmission path switching system according to the present invention is applied. In the figure, the cross-connect device 2 operates under the control of the transmission line network control device 1. The cross-connect device 2 includes a device control unit 3 that is controlled by the transmission line network control device 1, an interface reception unit 4 that receives a signal from the transmission line,
It comprises a cross-connect switch section 5 for cross-connecting transmission path signals, and an interface transmission section 6 for sending out cross-connected transmission path signals to the transmission path.

Here, the interface receiver 4 has
A path ID detection unit 7 that detects the path ID from the input signal, a reception path ID holding unit 8 that holds the detected path ID, a comparison path ID holding unit 13 that holds the switching source path ID, and a path ID. A path ID comparison unit 14 that compares
It has a transmission path ID holding unit 10 and a transmission path ID insertion unit 9.

The operation of switching the transmission lines by the plurality of cross-connect devices 102, 202, 302 arranged on the transmission lines 11, 12 will be described with reference to FIG. Now, let us consider a case where the cross-connect device 302 tries to switch a signal input from the transmission line 11 to a signal input from the transmission line 12 via a bypass route. Transmission line network controller 1
From the device control units 103 and 203, cross-connect setting commands a and b are sent, and the cross-connect devices 102 and 202 perform cross-connect settings. Next, the transmission line network control device 1 sends a transmission line switching command c to the device control unit 303 in order to switch the transmission line in the cross-connect device 302.

The device control unit 30 which has received this command c
3 issues a path ID comparison command to the interface receiving unit 304,
Reception path ID holding unit 308 connected to the transmission path 11
(H) is transferred to the comparison path ID holding unit 313 connected to the transmission path 12. In this case, in the path ID comparison unit 314 in the cross-connect device 302, the same content as the transferred path ID is detected by the path ID detection unit 307 connected to the transmission path 12 and written in the reception path ID holding unit 308. Until comparison is made (i).

When the comparison results are in agreement, a response of agreement is returned to the device control section 303 (j). Upon receiving the response of this coincidence, the device control unit 303 issues a switching request signal g to the cross-connect switch unit 305. As a result, the cross-connect switch unit 305 switches from the transmission line 11 to the transmission line 12.

As described above, a signal which is branched into two in the opposite device and is input via a different route is received, and the matching of the path IDs in the received signal is confirmed to confirm, for example, the transmission route from the route A to the route B. When switching is performed, since the path ID held in the switching source interface receiving unit is transferred to the comparison path ID holding unit in the switching destination interface receiving unit, the device control unit sends the path ID comparison command. Is sent only once, it is possible to autonomously compare the path IDs and return a coincidence response until the path ID of the switching destination arrives.

[0013]

As described above, according to the present invention,
In the opposite device, a transmission path signal that is branched into two and arrives via different paths is received, and it is confirmed that the received transmission path signal is the same signal by the path ID uniquely given to the transmission path signal in the opposite device. When switching the transmission path, a comparison path ID holding unit and a path ID comparison unit are provided, the switching source path ID is stored in the switching destination comparison path ID holding unit, and the stored switching source path ID and the reception Pass I
Since the transmission path is switched by causing the path ID comparison unit to compare with the path ID of the switching destination accommodated in the D holding unit, the device control unit sets the path ID from the reception path ID holding unit. It is not necessary to repeatedly perform read-out and comparison, so that it becomes possible to allocate other control during this period.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an apparatus to which a transmission path switching system according to the present invention is applied.

FIG. 2 is a diagram illustrating a transmission path switching operation of the above device.

FIG. 3 is a block diagram of a conventional device that performs transmission path switching control.

FIG. 4 is a diagram illustrating a transmission path switching operation of a conventional device.

[Explanation of symbols]

1 Transmission Line Network Control Device 2, 102, 202, 302 Cross-Connect Device 3, 103, 203, 303 Device Control Unit 4, 104, 204, 304 Interface Reception Unit 5, 105, 205, 305 Cross-Connect Switch Unit 6, 106 , 206, 306 Interface transmission unit 7, 107, 207, 307 Path ID detection unit 8, 108, 208, 308 Reception path ID holding unit 9, 109, 209, 309 Reception path ID insertion unit 10, 110, 210, 310 Transmission Path ID holding unit 11, 12 Transmission path 13, 113, 213, 313 Comparison path ID holding unit 14, 114, 214, 314 Path ID comparison unit

Claims (1)

[Claims] 1. A device control unit for receiving a command from a transmission line network control device, an interface reception unit for receiving a transmission line signal sent from an opposite device under the control of the device control unit, and a cross-connect. A cross-connect device that includes a cross-connect switch that performs the transmission, and an interface transmission unit that transmits a signal to a transmission line, and that switches the transmission line under the control of the transmission line network control device, wherein the received transmission is received in the interface reception unit. A path ID detection unit that detects a path ID from the road signal, a reception path ID holding unit that holds the path ID, and a comparison path ID
A holding unit and a path ID comparison unit are provided to receive the transmission path signal that is branched into two in the opposite apparatus and arrives via different paths, and the received transmission path signal is uniquely given to the transmission path signal in the opposite apparatus. When the transmission path is switched after confirming the same signal by the stored path ID, the path ID of the switching source is stored in the comparison path ID holding unit of the switching destination, and the stored path ID A transmission path switching system characterized in that transmission path switching is performed by performing comparison with a path ID of a switching destination accommodated in the reception path ID holding section in the path ID comparison section.