JPS60182832A - Supervisory system of multiplex separating device - Google Patents

Abstract

PURPOSE:To supervise both active and spare lines by reflecting an active multiplexed high-speed signal to a spare separating section, decreasing the speed, comparing it with a low speed signal, inputting a received high-speed signal inputted to the active separating section to the spare separating section and comparing the result with it. CONSTITUTION:An n sets of input low speed transmission signals are inputted from a device (not shown), the speed is increased at a multiplex line 22 via a selection circuit 21, and the result is transmitted to a line 30. Further, a reception high-speed signal is inputted through a line 40 from a device (not shown), selected (52) and transmitted to a line 60 via a separation circuit 53 and a selection circuit 54. A supervisory section 70 inputs a signal selected (24) one by one from the selection circuit 21 of a multiplex section 20 to a comparison circuit 74. The signal whose speed is decreased at the separation circuit 53 of the reception separating section and selected (54) is compared with a signal transmitted to the multiplex section 20 by a generating circuit 72 at a comparison circuit 71. The signal selected (55) one by one from the selection circuit 54 is compared with the output of the selection circuit 24 at the comparison circuit 74. The output of the multiplex circuit 22 is reflected directly to the selection circuit 50, the speed is decreased and the signal is compared with the input. Thus, the active circuit is supervised.

Description

Detailed Description of the Invention [Technical Field to which the Invention Pertains] The present invention multiplexes a plurality of n digital transmission low-speed signals into one digital transmission high-speed signal, and multiplexes one digital reception high-speed signal into a plurality of n digital transmission high-speed signals. The present invention relates to a monitoring method for a demultiplexer that separates received low-speed signals.

In particular, a plurality of m demultiplexing devices are provided, one of which operates as the active device, and the other devices are kept on standby as backup devices, so that when there is an abnormality in the active device, one of the backup devices is used as the active device. The present invention relates to a monitoring method for a demultiplexing device configured to be connected.

[Description of prior art]

FIG. 1 is a block diagram of a conventional system.

In this method, n low-speed transmission signals are input to the line 10, and the multiplexer 20 multiplexes them with the high-speed transmission signals.
Send to 0. Further, the received high-speed signal arriving at the line 40 is separated into received low-speed signals by the separating section 50, and is sent to the line 60.
It is sent out as a received low-speed signal.

In addition, each multiplexer 20 and demultiplexer 50 are m-multiplexed (in this case, m=2, that is, duplexed), as indicated by the symbols 201.202.501.502, and one of them is used as an active device. Some devices are configured to operate, while others are configured to stand by as standby devices.

This device includes a monitoring section 70 and is configured to perform detailed monitoring of devices that are on standby as standby devices. That is, a pseudo low-speed signal is sent from the monitoring section 70 to the circuit 90, and this is given to the multiplexing section (202 in FIG. 1) which is on standby as a standby device, and this output high-speed signal is sent to the circuit 90, which is on standby as a standby device. The output low-speed signal of the separating section 502 is taken into the monitoring section 70 from the circuit 80, and the low-speed signal sent to the circuit and the low-speed signal taken into the circuit 80 are connected back to the separating section (502 in FIG. 1). If the signals match, it is determined that the device standing by as a standby device is in a normal state.

However, with this method, devices that are on standby as standby devices can be judged through pseudo signals, but devices operating as active devices cannot be passed through pseudo signals, so pass/fail judgments can be made using another method. Is going. For example, the voltage and current of each circuit part or the signal clock, level, etc. must be monitored, making it impossible to make a comprehensive judgment on the operation.

[Purpose of the invention]

The present invention improves on this, and aims to provide a monitoring method that can perform comprehensive quality judgment not only on devices that are on standby as standby devices, but also on active devices.

[Features of the invention]

The present invention provides a first means for branching an input transmission low-speed signal of a multiplex circuit of an active device, a second means for branching an output transmission high-speed signal of a multiplex circuit of the current device, and a branching method by the second means. third means for selectively connecting the transmitted high-speed signal to a standby separation circuit as a standby device; fourth means for comparing the output low-speed means of the separation circuit with the input transmission low-speed signal; a fifth means for branching the input received high-speed signal of the separation circuit of the active device; and a fifth means for selectively connecting the received high-speed signal branched by the fifth means to the separation circuit on standby as the backup device. a seventh means for branching the output receiving low-speed signal of the separation circuit of the active device; and a standby device connected to the output receiving low-speed signal branched by the seventh means. and a means for comparing the output low-speed signal of the apparatus, and is configured to make a comprehensive quality judgment even for the current device in operation.

[Explanation based on examples]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of a monitoring system of a demultiplexing apparatus according to an embodiment of the present invention. In FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals. n input transmission low-speed signals from a device not shown are sent to the selection circuit 2 in the multiplexer 20 via the line 10.
1 is input. The n low-speed signals selected from the selection circuit 21 are connected to the multiplex circuit 22. A line 30 multiplexed from the multiplex circuit 22 is connected to a common contact of switch n, and a transmission high-speed signal is sent from one switching contact of switch 23 via line 30 to a device not shown. Further, a received high-speed signal arrives on the line 40 from a device not shown, and is connected to one switching contact of a switch 51 in the separating section 50. The other switching contacts of the switch arm 51 are connected to each other.

The n low-speed signals separated from the separation circuit 53 are connected to the selection circuit 54. A received low-speed signal is selected from the selection circuit 54 and outputted via the line 60 to a device not shown. Also,
The reception monitoring low speed signal is selected and connected to the comparison circuit 71 in the monitoring section 70 from the selection circuit 54 to the circuit 80 . A low-speed signal for transmission monitoring from the low-speed signal generation circuit 72 is connected to the selection circuit 21 and the comparison circuit 7 through the circuit 90.

From the comparison circuit 71 to the spare multiplexer 20 and the spare demultiplexer 5
Check whether the operation with 0 is normal and send the result to the control circuit 7.
3 is input. The control circuit 73 is connected to the multiplexer 20 and the demultiplexer 50 via the bus 100, and the multiplexer 20
The failure information from the separation unit 50 is input to the control circuit 73 to determine whether the current use or standby is used, and the control circuit 7
3 to the control circuit 21 of the multiplexer 20 and the demultiplexer 50.
A selection signal is output to 54, switches 21, 51, etc.

Here, the features of the present invention are as described below. That is, the selection circuit 24 is included in the multi-electrification section 20.
is provided, and n low-speed signals from the selection circuit 21 are sequentially selected.
The signals are selected one by one and connected to the monitoring unit 70 via the circuit 110 as the active transmission monitoring low-speed signal.

Further, a selection circuit 52 is provided in the separation unit 50, and the multiplexing circuit 22
The current transmission monitoring high-speed signal is applied from the circuit 140 through the circuit 140, the current reception monitoring high-speed signal is applied from the common contact of the switch 51 in the other separation unit 50, and the current reception monitoring high-speed signal is applied from the common contact of the switch 51 in the own lung unit 50. One of the high-speed signals transmitted from the contacts is selected to form one high-speed signal, and this is output to the separation circuit 53.

Further, a selection circuit 55 is provided in the separation section 50, and the selection circuit 54
The active selection circuit 55 selects n low-speed signals from li! to the circuit 120 as the active reception monitoring low-speed signal, and the backup selection circuit 55 sends them as the preliminary reception monitoring low-speed signal or the preliminary transmission monitoring low-speed signal li! &130, and connects it to the monitoring section 70.

Furthermore, a comparison circuit 74 is provided in the monitoring section 70, and the selection circuit 2
The current transmission monitoring low speed signal (110) from 4 and the backup transmission monitoring low speed signal (130) from the backup selection circuit 55 are compared to determine whether the operation of the current multiplexing unit 20 and the backup separation unit 50 is normal. Also, the current reception monitoring low speed signal (120) from the current selection circuit 55 and the backup selection circuit 55
Comparing with the preliminary reception monitoring low speed signal (130) from
The multiplex circuit 22 and the selection circuit 24, 52, 55 are connected to the control circuit 73 via the bus 100, which checks whether the operation of the current separation section 50 and the standby separation section 58 is normal and outputs the result to the control circuit 73. Control signals are output to etc.

The operation of the monitoring method of the multiplexing/demultiplexing device having such a configuration will be explained. In FIG. 2, the multiplexing section 202 and the separating section 5 (1+ are currently in use), the multiplexing section 202 and the separating section 5
02 will be explained as a backup. The operation monitoring of the present invention consists of three steps, and the first step is to
02 and the operation monitoring of the demultiplexing section 502 are the same as the conventional method, so the explanation will be omitted. Low speed signal (110) and spare separation section 502
The active transmission monitoring high speed signal (140) sent from the active multiplexing unit 201 is compared with the separated preliminary transmission monitoring low speed signal (130). The third step is to compare the active reception monitoring low-speed signal (120) from both the active and backup separation units 5 (h, 502) and the backup reception monitoring low-speed signal (130) obtained by separating the reception high-speed signal (40). do.

The operation is monitored in the above three steps, and the first step is to monitor the backup multiplexer 202 and demultiplexer 502. However, if an error is detected in the first step, the current multiplexer 201, Furthermore, even if a failure occurs in the separating section 501, switching to the standby mode is prohibited by the control signal 100 of the monitoring section 70. If an error is detected in the second and third steps, the system is automatically switched to the standby side.

Although the embodiment has been described above in which there are two multiplexing sections and two demultiplexing sections and duplication is performed, a case where a plurality of multiplexing sections and a plurality of demultiplexing sections are multiplexed may be used.

〔Effect of the invention〕

As explained above, the present invention returns the high-speed signal multiplexed by the current multiplexing section to the standby separation section, compares the multiplexed low-speed signal and the separated low-speed signal, and By inputting the received high-speed signal that is input to the demultiplexer into the backup demultiplexer and comparing the low-speed signals separated by both demultiplexers, the operation of the backup multiplexer and demultiplexer can be monitored as well as the current multiplexer. Since the operation of the multiplexing section and the separating section is also monitored, it is possible to detect failures that cannot be detected by the fault monitoring circuits provided in the multiplexing section and the separating section, and there is an excellent effect that comprehensive quality judgment can be performed.

Therefore, switching to the standby mode is performed reliably, and there is an advantage that high reliability of the demultiplexing device and the line can be ensured.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional monitoring system for a demultiplexer. FIG. 2 is a block diagram of a monitoring system of a demultiplexing apparatus according to an embodiment of the present invention. l0130.40.60... Line, 20-... Multiplexing section, 21.24.54.55... Selection circuit, 22 river multiplexing circuit, 23.51... Switch, 50... Separation section , 53... Separation circuit, 7o... Monitoring section, 71.74
. . . Comparison circuit, 72 . . . Low-speed signal generation circuit, 73.
...Control circuit, 80.90.110, 120, 13
0...Circuit, 100...Bus. Patent applicant NEC Corporation Representative Patent attorney Naotaka Ide, ¥-+1 (2

Claims (1)

[Claims] +11 A multiplexing circuit that multiplexes a plurality of n low-speed transmission signals into one high-speed transmission signal, and a separation circuit that separates one high-speed reception signal into a plurality of n low-speed reception signals, respectively. A plurality of m multiplex circuits and demultiplexing circuits are provided, and each one of the m multiplex circuits and demultiplexing circuits is connected to each signal line as an active device, and connection control is performed so that the multiplex circuits and demultiplexing circuits other than the current device are on standby as standby devices. means for applying a low-speed signal to the multiplex circuit that is on standby as the standby device, and a means for applying a low-speed signal to the multiplex circuit that is on standby as the standby device; In a monitoring system for a demultiplexing device comprising means for connecting to a circuit and means for comparing an output low speed signal of a demultiplexing circuit connected by the means with said low speed signal, the input transmitted low speed signal of said multiplex circuit of said working device is a first means for branching the output transmission high-speed signal of the multiplex circuit of the active device; and a second means for branching the transmission high-speed signal branched by the second means as the standby device. third means for selectively connecting to the separation circuit; fourth means for comparing the output low speed means of the separation circuit with the input transmitted low speed signal; a fifth means for branching; a sixth means for selectively connecting the received high-speed signal branched from the fifth means to a separation circuit that is on standby as the backup device; and a separation circuit of the active device. a seventh means for branching the output received low speed signal of the seventh means; and a seventh means for comparing the output reception (i low speed signal) branched by the seventh means with the output low speed signal of the backup device connected by the sixth means. 1. A monitoring method for a demultiplexing device, comprising: a means for monitoring a demultiplexing device;