JPH0683167B2 - Digital data transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for a digital transmission device including a plurality of channel units and a common unit for controlling them. In particular, it relates to channel control means.

〔Overview〕

The present invention provides a digital data transmission device having a converter circuit that allocates each of input signals to a designated time slot based on the data of the control circuit, by disconnecting the converter circuit from the transmission line when the control circuit malfunctions, It is possible to prevent failures due to abnormal allocation to the.

[Conventional technology]

In the conventional example, as shown in FIG. 2, the common control circuit 301 '
The control circuits 103 and 203 to which the control signal from the input circuit is input generate data designating the time slots of the input signals to the converter circuits 101 and 201. The outputs of the converter circuits 101 and 201 are sent to the digital transmission line 40 via the interface circuit 302 provided to the common line 10.

[Problems to be solved by the invention]

However, in such a conventional example, there is a drawback that the control circuit operates abnormally and the input signal is sent to the digital transmission line even if it is not correctly assigned to a predetermined time slot.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a digital data transmission device capable of preventing a failure due to abnormal allocation to a time slot.

[Means for solving problems]

The present invention provides a terminal to which a plurality of input signals arrive, a converter circuit that generates a signal in which one of the input signals passing through this terminal is assigned to a specified time slot, and data that specifies the time slot. A plurality of channel parts each having a control circuit given to the above, a common part including an interface circuit for connecting the output of the converter circuit of each channel part to a digital transmission line, and a common control circuit for giving time slot allocation information to the control circuit. In the digital data transmission device including the above, each of the channel units is connected to the output of the converter circuit, and prohibits passage of a signal generated by the converter circuit of the own channel unit when the control circuit of the own channel unit is abnormal. A switch circuit is provided, and the common control circuit controls each channel section. Monitoring the circuit, characterized in that it comprises control means for controlling when detecting the abnormality allocation information of the time slot is not normally transmitted to the control circuit the switch circuit to open circuit.

[Action]

The converter circuit outputs the input signal to the designated time slot based on the data from the control circuit. The output of this converter circuit is transmitted to the digital transmission line via the switch circuit. By the way, the switch circuit is closed when the control circuit is operating normally, but is opened when the control circuit is abnormal.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
The figure is a block diagram showing the configuration of this embodiment.

In this embodiment, as shown in FIG. 1, a converter circuit 101 that outputs an input signal 110 in a time slot designated by time slot data 130, an output 12 of the converter circuit 101.
Input 0 and switch control signal 20 from the common control circuit 301
Corresponding to the channel section 100 having the control circuit 103 for inputting the control signal 30 from the switch circuit 102 and the common control circuit 301 for outputting to the common line 10 and outputting the time slot data 130, and the same configuration as the channel section 100. Channel unit 200, a common control circuit 301 that outputs a switch control signal and a control signal to a plurality of channel units, and an interface circuit 302 that connects the outputs of the switch circuits of the plurality of channel units to the digital transmission path 40. And a common unit 300 having. That is, in this embodiment, an input terminal 400, which is a terminal to which a plurality of input signals arrive, and a converter circuit 10 for generating a signal in which one of the input signals passing through this terminal 400 is assigned to a designated time slot.
1 and a channel section 100 having a control circuit 103 for generating data designating a time slot and giving this converter circuit 101 and a channel section 200 having the same configuration as the channel section 100, each of the channel sections 100 further includes: A switch circuit 102 is provided which is connected to the output of the converter circuit 101 and which prohibits passage of a signal generated by the converter circuit of the own channel section when the control circuit 103 of the own channel section is abnormal.

Next, the operation of this embodiment will be described.

First, a case where the channel unit 100 is mounted will be described.
The common control circuit 301 controls the channel unit 100 via the control signal 30.
The control circuit 103 is constantly monitored. Before the channel unit 100 is mounted, the common control unit 301 recognizes that the common control unit 301 is not mounted, and sets the switch control signal 20 so that the switch circuit 102 is opened. When the channel unit 100 is mounted, the common control unit 301 recognizes the mounting and communicates with the control circuit 103 using the control signal 30 to set the time slot data 130 in the converter unit 101. When normal data is set in the control circuit 103, the common control unit 301 controls the switch control signal 20 to put the switch circuit 102 in a closed state. This causes the input signal 110 to be output at the correct time slot position on the common line 10. Also, in the case of an abnormality in which normal data is not transmitted to the control circuit 103, the common control unit 3
The switch circuit 102 is kept open by 01.

Further, when the abnormality of the control circuit 103 is detected, the common control circuit 301 constantly monitors through the control signal 30, so the common control unit 301 performs the switch control so as to open the switch circuit 102. Control signal 20.

Further, this control can be realized by expanding the control signal of the common control unit 301 and the switch control signal even if the channel unit 200 and the plurality of channel units are present.

〔The invention's effect〕

As described above, the present invention operates the switch circuit connected to the common line when the channel section operates normally, and does not operate when there is an abnormality. There is an effect that can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a conventional example. 10 …… Common line, 20,21 …… Switch control signal, 30,31…
… Control signal, 40… Digital transmission line, 100… Channel section, 101… Converter circuit, 102… Switch circuit,
103 ... control circuit, 110 ... input signal, 120 ... converter circuit output, 130 ... time slot data, 200 ... channel part, 300 ... common part, 301, 301 '... common control circuit, 302 ... ... interface circuit, 400 ... input terminal.

Claims (1)

[Claims] Claim: What is claimed is: 1. A terminal to which a plurality of input signals arrive, a converter circuit for generating a signal in which one of the input signals passing through the terminal is assigned to a designated time slot, and data for designating the time slot. A common part including a plurality of channel parts each having a control circuit to be provided to the circuit, an interface circuit for connecting the output of the converter circuit of each channel part to a digital transmission line, and a common control circuit for giving time slot allocation information to the control circuit. In the digital data transmission device including and, each of the channel parts is connected to the output of the converter circuit, and the passage of the signal generated by the converter circuit of the own channel part is prohibited when the control circuit of the own channel part is abnormal. A switch circuit for controlling each channel The control circuit monitors the digital data transmission apparatus, characterized in that it comprises control means for controlling when detecting the abnormality allocation information of the time slot is not normally transmitted to the control circuit the switch circuit to open circuit.