JP2000324201A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily evaluate a part where a fault occurs by inserting and transmitting a false signal, when a signal interrupt is detected. SOLUTION: When a 1st input interrupt detection part 34 detects input interrupt at a prescribed time interval in the number (m) of protection stages of an input signal S1 transmitted from an upstream card, a switch signal C is inputted to a false signal inserting part 32. Meanwhile, if a signal absent state lasts into a number (n) of protection stages at a 2nd input interrupt detection part 35 which detects the input interrupt in the number (n) of protection stages that is larger than the number (m) of protection stages, an input interrupt alarm A is transmitted to an alarm processing part to prescribe a part where the abnormality is occurring. A false signal generation part 33 supplies a false signal D of a pulse that varies from 1 to 0 or vice versa with a certain period to the part 32. The signal C switches the signal processed at a signal processing part 31 to the signal D, and an output signal S2 is supplied to a downstream card. Thereby, since if the input interrupt of the signal S1 is detected continuously (m) times, the signal D is inserted, the input interrupt of the signal S1 will not last (n) times which is larger than (m) times, and accordingly no alarm is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to alarm signal processing in an apparatus such as a communication apparatus, and more particularly to a technique for easily specifying a source of an alarm to which alarm information spreads, such as an interruption of an input signal.

[0002]

2. Description of the Related Art In a transmission device for transmitting a large amount of data over a long distance with a large amount of data, a plurality of lines (here, low-speed lines) connected to the transmission device are basically multiplexed. Thus, transmission is performed on a higher-speed transmission path (high-speed transmission path).

[0003] Such an information transmission apparatus has a main configuration in which a main signal system includes a high-speed interface section connected to a high-speed transmission path, and a part of high-speed data separated into a low-speed side. It is composed of a line setting unit that connects and multiplexes signals from the low-speed side to the high-speed side line, a low-speed side interface that is connected to the low-speed side, and other components, and a control unit that performs various controls in the device. I have.

[0004] In these transmission devices, each part in the device is composed of a plurality of cards (substrates).
When each card detects an abnormality such as interruption of an input signal sent from a card located upstream, it issues an alarm signal to the control unit and detects which part of the device has an abnormality. I can do it.

Here, FIG. 5 is a diagram schematically showing a configuration for generating an alarm when an abnormality occurs in the communication device.

For example, in an intermediate card 51 located at a certain part in the apparatus, an input signal S1 is received from an upstream card (not shown) located upstream and is inputted to a signal processing unit 511 in the intermediate card 51. . And the intermediate card 5
The input signal S1 subjected to signal processing in 1 is output as an output signal S2 to a downstream card (not shown) located downstream. The input signal S1 is also input to the input disconnection detection unit 512. When an input disconnection occurs in the input signal S1, the input disconnection detection unit 512 detects the input disconnection, and an input disconnection alarm A is output from a control unit (not shown). To send to.

[0007] On the other hand, the input disconnection is also detected in the downstream card of the intermediate card 51, and alarms such as the input disconnection occurring in each card are collected in a predetermined alarm processing unit.

[0008]

In a conventional communication apparatus, for example, when an input disconnection is detected in a certain intermediate card, the input disconnection is similarly detected in a downstream card located downstream of the intermediate card, and an input disconnection alarm is issued in the downstream card as well. Occurs. In this way, an input disconnection alarm is generated for a card that has detected an input disconnection and for all cards located downstream of the card. Therefore, many input disconnection alarms are collected in the alarm processing unit. As a result, when the highest-level alarm is specified, the amount of signal processing increases, and the circuit size for processing the alarm increases. Therefore, an alarm processing unit having a large circuit scale is required.

[0009] In specifying the source of the alarm,
If there is a cross-connect section or the like in the middle, it is necessary to specify the uppermost alarm in consideration of the signal connection path such as the setting of the cross-connect section. At the same time, it is necessary to perform processing such as masking the spillover alarm. For such processing, an alarm processing circuit for specifying the highest-level alarm, application software for evaluating the location of a failure, etc. Is needed. For this reason, the process for evaluating the failure location becomes complicated, and it takes time to evaluate the failure location, and switching from the working system to the standby system is delayed, such as when the transmission system has a redundant configuration. There is a problem.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a communication device that can easily determine the location of a failure.

[0011]

According to the present invention, there is provided a communication apparatus comprising: a first input signal disconnection detecting unit for detecting a disconnection of an input signal by a first protection stage number; and a pseudo signal output by controlling the switching signal. A pseudo-signal generation unit, a second input signal disconnection detection unit that generates an input disconnection alarm when the disconnection of the input signal is detected with a second protection stage number greater than the first protection stage number, A pseudo signal insertion unit for inserting and transmitting a pseudo signal generated by the pseudo signal generation unit when a signal interruption is detected by the input disconnection detection signal.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIG.

Reference numeral 11 denotes a signal transmission device, which is a working system high-speed interface (HS I / F) 114, 116 connected to the high-speed working lines SL1, SL2, and a protection system connected to the high-speed protection lines PL1, PL2. System high-speed interface units (HS I / F) 115 and 117, and a low-speed interface unit (LS I / F) connected to the low-speed transmission line LL.
F) 112, a part of received data received from the high-speed side working lines SL1, SL2 or the high-speed side protection lines PL1, PL2 is separated and the low-speed side interface unit (LS I / F) 11 is separated.
2 or a signal processing device 11 or a line setting unit 1 that multiplexes data input from a low-speed side interface unit (LS I / F) 112 into a high-speed signal and outputs the multiplexed signal.
11 and the like. The line setting unit 111
Is performed under the control of the control unit 113.

The low-speed interface 112 and the high-speed interfaces 114 to 117 perform processing such as conversion of a signal to be transmitted / received from light to electricity, conversion from electricity to light, amplification, and alarm detection.

In the above-described configuration, for example, the flow of a signal sent to the signal transmission apparatus 11 is a path sent from the active high-speed interface 116 to the high-speed interface 114 via the line setting unit 111. There are various routes such as a route sent from the active high-speed interface 114 to the low-speed interface 112 via the line setting unit 111.

FIG. 2 schematically shows such various signal paths.

For example, the high-speed interface 1 of the active system
For example, taking a route from the network interface 14 to the low-speed interface 112 via the line setting unit 111, the high-speed interface 114 corresponds to the upstream card, the line setting unit 111 corresponds to the intermediate card, and the low-speed interface 112 corresponds to the downstream card. .

Here, the general structure of the intermediate card 22 will be described with reference to FIG. Symbol S1 is an input signal transmitted from the upstream card (numeral 21 in FIG. 2).
It is shown as in FIG.

The input signal S1 is input to a signal processing section 31, where signal processing to be performed by the card is performed. The input signal S <b> 1 is input to the signal processing unit 31, and at the same time, the first input disconnection detection unit 34 and the second input disconnection detection unit 35
Is also entered.

Here, the first input disconnection detecting section 34 is a circuit for detecting an input disconnection with the first protection stage number m. As shown in FIG. 4B, the first input disconnection detecting unit 34 detects the presence or absence of the input signal S1 at predetermined time intervals. Here, the input signal disconnection is detected in order to prevent the detection error from fluctuating due to a bit error due to a transmission error, and when no signal is detected continuously for the first protection stage number m, it is determined that the input signal is disconnected. A switching signal C as indicated by reference numeral C in FIG. 4C is generated and output to the pseudo signal insertion unit 32.

On the other hand, the second input disconnection detecting section 35 is a circuit for detecting an input disconnection with the second protection stage number n which is larger than the first protection stage number m. The second input disconnection detection unit 35 generates an input disconnection alarm as indicated by a symbol A in FIG. 4D when the state without a signal continues continuously over the number of protection stages n. The input disconnection alarm A is sent to an alarm processing unit (not shown), and is used for specifying a location where an abnormality has occurred.

The pseudo signal D is supplied from the pseudo signal generator 33 to the pseudo signal insertion unit 32. The pseudo signal D is formed of, for example, a pulse-like signal that changes from 1 to 0 or from 0 to 1 at a certain period, as shown by a symbol D in FIG.

The pseudo signal insertion unit 32 switches between the signal processed by the signal processing unit 31 and the pseudo signal D by the switching signal C supplied from the first input disconnection detection circuit 34, and FIG. ), It is output to the downstream card (reference numeral 23 in FIG. 2) as an output signal S2.

In the downstream card, similarly to the intermediate card, a first input disconnection detecting unit 34 having m protection stages and a second input disconnection detecting unit 35 (m <n) having n protection stages are similarly provided. ing. Therefore, before the intermediate card, the input signal S1
In this case, the pseudo signal is inserted from the intermediate card when the input disconnection is detected m consecutive times, which is the first number of protection stages, from the intermediate card. Therefore, the operation does not continue over the protection stage number n larger than the protection stage number m, and the input disconnection alarm as indicated by the symbol A in FIG. 4D is not generated.

According to the above configuration, for example, only the highest alarm detected on the intermediate card is sent to the alarm processing unit, and no input disconnection alarm is sent from the downstream card. Therefore, it is possible to prevent the input disconnection alarm from spreading to the downstream card, so that the alarm processing unit reduces the number of input disconnection alarms to be processed, thereby facilitating the specification of the alarm occurrence location.

In particular, when the data is transmitted via a card related to line setting such as a cross-connect unit, the location where an alarm is generated can be specified without considering the line setting status. Therefore,
A processing circuit for specifying the highest-order alarm is not required, and the circuit configuration is simplified. Further, the location where the alarm is generated is quickly specified. Therefore, the switching operation can be performed in a short time, for example, when a redundant configuration is employed.

In the above-described embodiment, a case where a signal to be processed is transmitted from the active high-speed interface to the line setting unit and from the line setting unit to the low-speed interface in the signal processing device will be described. are doing.
However, the same applies to the case where the signal to be processed is transmitted from the low-speed interface to the line setting unit, and from the line setting unit to the active high-speed interface.

Further, the present invention is not limited to the signal transmission device,
The present invention can be applied to all cases in which a signal to be processed sequentially transmits a plurality of cards (substrates).

[0029]

According to the present invention, it is possible to realize a communication device in which an alarm can be easily specified.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram for explaining an embodiment of the present invention.

FIG. 2 is a configuration diagram for describing an embodiment of the present invention with a card configuration.

FIG. 3 is a circuit configuration diagram for explaining an intermediate card used in the embodiment of the present invention.

FIG. 4 is a time chart for explaining the operation of the embodiment of the present invention.

FIG. 5 is a circuit configuration diagram for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Signal processing apparatus 111 ... Line setting part 112 ... Low-speed side interface 113 ... Control parts 114-117 ... High-speed side interface 21 ... Upstream card 22 ... Intermediate card 23 ... Downstream card 31 ... Signal processing part 32 ... Pseudo signal insertion part 33 ... Pseudo signal generator 34 ... First input disconnection detector 35 ... Second input disconnection detector S1 ... Input signal S2 ... Output signal A ... Input disconnection alarm C ... Switching signal D ... Pseudo signal m, n ... Number of protection stages

Claims (2)

[Claims] 1. A first input signal disconnection detecting section for detecting a disconnection of an input signal by a first protection stage number, a pseudo signal generating section for generating a pseudo signal output by controlling a switching signal, and a disconnection of the input signal. A second input signal disconnection detection unit that generates an input disconnection alarm when the signal is detected with a second protection stage number greater than the first protection stage number, and when a signal disconnection is detected in the first input disconnection detection signal. A communication apparatus comprising: a pseudo signal insertion unit configured to insert and transmit a pseudo signal generated by the pseudo signal generation unit. 2. The pseudo signal is changed from 1 to 0 or 0.
The communication device according to claim 1, wherein the communication device has a change point that changes from "1" to "1".