JP2809006B2 - Line monitoring method between switching nodes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for monitoring lines between switching nodes, and more particularly to a system for monitoring lines between switching nodes when the line quality of a communication line between switching nodes is extremely high.

[0002]

2. Description of the Related Art Conventionally, in error control of a layer 2 protocol in a communication protocol on a communication line between switching nodes, when a transmission error is detected, a unit of this signal is discarded, error recovery is performed by retransmission, and error recovery is performed. If it is not possible, control such as switching this communication line is performed.

[0003]

The conventional line monitoring method between switching nodes uses a layer 2 protocol suitable for a communication line of relatively low quality even if the communication line quality between switching nodes is extremely high. There is a problem that control of heavy equipment is performed by error control, and detection of a line failure is complicated.

[0004]

According to the present invention, the first
The second switching nodes are connected by a high-quality communication line that is duplicated, and signals are normally transmitted and received to and from the working line .
In the error control layer 2 protocol on the communication line between the reception capable switching node signals for signal are possible and the protection line, at least once a transmission error detection
Ru switching to spare the communication line from the working when issued
And line switching means, switches from the switching current when received within the response signal a predetermined time again to the previous SL health check signal transmitted through the old working line became protection line a health check signal to the other switching node by the preliminary Return
Passing to notify the to line switch return means, the effect when not receiving the response signal within the predetermined time after switching the communication line to the other switching node through the working line after switching the
Switching node connecting line superintendent, characterized in that it comprises a knowledge unit
A visual system is obtained .

[0005] Further, the notifying means transmits the health check signal to the partner exchange node and then performs the switching.
More wherein became pre old working line again transmission error switching node connecting line, characterized in through the working line after the switching when detecting that a notification of switching the communication line to the other party switching node monitoring A scheme is obtained .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1A is a system block diagram showing an embodiment of a line monitoring method between switching nodes according to the present invention, and FIG. 1B is a block diagram showing an example of a switching node in FIG.

As shown in FIG. 1 (a), the system of this embodiment is configured by connecting switching nodes A1 and B2 with high-quality duplex communication lines 101 and 102, and is initially constructed. The communication line 101 is the working line, and the communication line 1
02 is a protection line. Switching node A1 and switching node B
2 transmits and receives signals through the working communication line 101, and can receive signals on both the communication line 101 and the standby communication line 102.

Next, the operation of this embodiment will be described with reference to FIGS. 1 (a) and 1 (b). As shown in FIG. 1B, the switching node A1 includes a user processing unit 11 and a signal transfer unit 12, and the signal transfer unit 12 mainly includes a signal transmission / reception control unit 14 that controls a layer 2 protocol and an upper layer processing unit. And a unit 15.

The switching node A1 receives the signal from the switching node B2 through the communication line (working) 101. If the reception is normal, the switching node A1 takes over the signal from the signal transmission / reception control unit 14 to the upper layer processing unit 15, and further receives the signal. Depending on the type, it is taken over by the user processing unit 13. If the reception is a transmission error, the signal transmission / reception control unit 14 of the switching node A1 switches the communication line 101 to the standby state, switches the communication line 102 to the working line, and transmits a health signal to the switching node B2 through the standby communication line 101. Send check signal. As a result, when a response signal to the health check signal is received from the switching node B2 through the communication line 101, the communication line 101 is determined to be normal and the signal transmission / reception control unit 14
Again switches the communication line 101 back to working and the communication line 102 back to standby. If a response signal to the health check signal transmitted by the signal transmission / reception control unit 14 cannot be received within a predetermined time, or if a transmission error is detected again, the signal transmission / reception control unit 14 of the switching node A1 sets the communication line (working). Switching node B2 through 102
By transmitting a line switching signal to the
And the switching of the communication line 101 to the standby is notified, and thereafter the switching node A1 and the switching node B2 can communicate with each other through the communication line (working) 102.

[0010]

As described above, according to the present invention, in a layer 2 protocol control on a communication line between switching nodes connected by a high-quality duplicated communication line, transmission
When an error is detected even once, the communication line is switched between working and protection, and then a health check signal and its response signal are transmitted to and received from the partner switching node through the old working line in which a transmission error has occurred. since to carry out the line health check, an effect that can be achieved with simplified and simplification of line fault detection of error control.

[Brief description of the drawings]

FIG. 1A is a system block diagram showing an embodiment of a line monitoring method between switching nodes according to the present invention, and FIG. 1B is a block diagram showing an example of a switching node in FIG.

[Explanation of symbols]

 Reference Signs List 1 switching node A 2 switching node B 11 user processing unit 12 signal transfer unit 13 upper layer processing unit 14 signal transmission / reception control unit 101, 102 communication line

Claims (2)

(57) [Claims] 1. A first, it is constituted by connecting the second high-quality communication line which among switching nodes and duplexing, usually can send and receive signals with respect to the working line <br/> There and in the error control of the layer 2 protocol on the communication line between the signal receiving capable switching node for the protection line, Den
And reserve the toggle its line switching means from the working of the communication line when detecting at least once an error sending to the switching
Means failback line to back off the spare from the working again when receiving more health check signal through the old working line became protection line within a predetermined time for a response signal for the previous SL health check signal transmitted to the other party switching node Notifying means for notifying that the communication line has been switched to the other switching node through the working line after the switching when the response signal is not received within the fixed time period, method. Wherein said notifying means by said switching after transmitting the health check signal to the other party switching node
Replacement of claim 1, wherein the notifying of switching the communication line to the other party switching node through the working line after the switching when detecting again the transmission error in the old working line became preliminary Node monitoring method.