JPH03286636A - Monitor circuit - Google Patents

Abstract

PURPOSE:To monitor the operating state of a branch/insert circuit in on line state without giving effect on substantial data communication by inputting a PN pattern to an idle input of the branch/insert circuit and using its output for the collation test. CONSTITUTION:A branch/insert circuit is provided, which has plural inputs and plural outputs corresponding one to one to the plural inputs. A data IN inputted from a transmission line is inputted to the branch/insert circuit 1, in which branch/insert control is implemented and the result is outputted as a data output OUT. Moreover, a PN patter S1 outputted from a PN pattern generating circuit 2 is inputted to an idle input for monitoring of the branch/ insert circuit 1 and its output S2 is inputted to a PN pattern collation circuit 3, and its monitor output MON is used for collation test. That is, the PN pattern and the PN pattern outputted from the branch/insert circuit 1 are collated by the collation circuit 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a circuit for monitoring the operating state of a branch/insertion circuit that performs branching/insertion of necessary data in data communication.
In particular, the present invention relates to a monitoring circuit for branch/add circuits that enables online monitoring.

[Conventional technology]

Conventionally, when checking the operation of a branch/add circuit alone, as shown in FIG. , change the connection to the measuring device 7 etc. using the switching devices 5 and 6 and check.

[Problem to be solved by the invention]

Therefore, in the conventional operation confirmation test described above, there is a problem in that the original data communication is stopped and operation confirmation cannot be performed while online.

[Means to solve the problem]

In order to solve such problems, the monitoring circuit of the present invention provides a PN pattern generation circuit and a PN pattern generation circuit for the branch/add circuit.
A pattern matching circuit is provided, the output of this PN pattern generation circuit is connected to a monitoring input of a branch/insertion circuit, and the output of the branch/insertion circuit corresponding to the input is connected to the pN pattern matching circuit.

[Effect]

In the present invention, the output of the PN pattern generation circuit is
By comparing the fi PN pattern with the PN pattern output from the drop/add circuit using the matching circuit, it is possible to monitor the operating state of the drop/add circuit in an on-line state.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a functional block diagram illustrating a monitoring scheme for monitoring the operating status of an on-line drop/add circuit according to an embodiment of the present invention. In FIG. 1, 1 is a branch/add circuit having a plurality of inputs and a plurality of outputs corresponding to the plurality of inputs on a one-to-one basis (6#).

Data IN input from a transmission path is input to a branch/insertion circuit 1, which performs branch/insertion control and is output as data output OUT. In the case, the PN pattern 81 output from the PN pattern generation circuit 2 branches/
input to the empty input for monitoring of the insertion circuit 1, input its output Sz to the PN pattern matching circuit 3, and input the monitor output M
It is designed to perform an ON-side comparison test.

According to the monitoring system of this embodiment, when the branch/add circuit 1 is operating normally, the PN pattern matching circuit 3, the PN pattern generation circuit 20, the PN pattern S! It can be seen from the monitor output MON that the PN pattern S1 and the output PN pattern S2 match, but in the event of a failure, the PN pattern S1 and the PN pattern 82 do not match. Therefore, the operating state of the branch/add circuit 1 can be monitored in an online state without affecting the original data communication as in the conventional case.

〔Effect of the invention〕

As explained above, the present invention inputs a PN pattern to the empty input of a branch/add circuit and performs a verification test on the output, thereby allowing online communication without affecting the original data communication. This has the advantage of being able to monitor the operating status of the branch/add circuit.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing one embodiment of the present invention.
FIG. 2 is a block diagram showing an operation test using the conventional E2FyJFi method. 1...Branch/insertion circuit, 2...PN pattern generation circuit, 3...PN pattern matching circuit.

Claims (1)

[Claims] A monitoring circuit for a branch/add circuit having a plurality of inputs and a plurality of outputs in one-to-one correspondence with the plurality of inputs, comprising a PN pattern generation circuit and a PN pattern matching circuit,
A monitoring circuit characterized in that an output of the N pattern generation circuit is connected to a monitoring input of the branch/add circuit, and an output of the branch/add circuit corresponding to the input is connected to the PN pattern matching circuit.