JPS6367797B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides a data highway device in which a data highway is interposed between an exchange and a subscriber.
This relates to a line control method for notifying data highway abnormalities.

Prior Art and Problems The subscriber trunk of an exchange is connected to a common terminal relay device, and this common terminal relay device and each terminal relay device accommodating a plurality of subscribers are connected by a loop-shaped data highway to a data highway device. Conventionally, when an abnormality occurs on the data highway, the switching equipment cannot identify whether or not the abnormality has occurred, so it is necessary to control incoming calls to the subscriber accommodated in the terminal relay equipment, or to control the reception of calls based on the abnormal signal. There was a drawback that the transmission control was sometimes carried out by

OBJECTS OF THE INVENTION The present invention has an object to notify an abnormality in a data highway to an exchange as a subscriber line disconnection, thereby preventing wasteful or erroneous operation of the exchange. Examples will be described in detail below.

Embodiments of the Invention FIG. 1 is an explanatory block diagram of a data highway device, in which 1 is a switch, 2 is a common terminal relay device, 3 is a terminal relay device, 4 is a subscriber, 5 is a data highway, and 6 is a switch. subscriber line between the subscriber trunk (not shown) and the common terminal repeater, 7
is a subscriber line between the terminal relay device and the subscriber, and subscriber line 6 and subscriber line 7 have a one-to-one correspondence. The common terminal relay device 2 performs multiplexing and demultiplexing of outgoing, incoming, and call information with the exchange 1, and the terminal relay device 3 accommodates a plurality of subscribers 4 and Transmission between 4 and
It multiplexes and demultiplexes information about incoming calls and telephone calls.

FIG. 2 is a block diagram of the main parts of the embodiment of the present invention, and shows one subscriber line 6 between the exchange 1 and the common terminal repeater 2, where 8 is a power supply and 9 is a ring link. A generation circuit, 10 is a contact 10a,
A switch circuit consisting of 10b, 11 is a contact 10
12 is a termination circuit, 13 is a transistor, and 14 is an alarm signal input terminal. When normal, the alarm signal is “1”
, transistor 13 is on, and relay 1
1 is in an operating state with a power supply voltage of +V, so the contacts 10a and 10b of the switch circuit 10 are in a make state. Therefore, when the subscriber 4 makes a call, the termination circuit 12 of the common terminal relay device 2 can form a loop with the exchange 1 via the subscriber line 6, and when the subscriber 4 receives a call, In this case, a paging signal can be sent from the exchange 1 to the subscriber line 6, and the paging signal received by the termination circuit 12 can be multiplexed by the common terminal relay device 2 and sent to the data highway.

When an abnormality occurs on the data highway, the fault is detected by a fault detection circuit (not shown) and
The alarm signal becomes “0” and the transistor 13
is off. As a result, the relay 11 is restored and the contacts 10a and 10b of the switch circuit 10 are brought into a broken state. In other words, the subscriber line 6 is disconnected, no calling information is sent to the exchange 1, and no calling signal is sent from the exchange 1 to the subscriber 4.

By providing the above configuration for subscribers,
In the case of a failure corresponding to the subscriber 4 accommodated in the terminal relay device 3, the common terminal relay device 2 disconnects the subscriber line 6 corresponding to that subscriber by controlling the switch circuit 10. , can notify the exchange 1 of the subscriber's failure. That is, since no loop current flows through the common terminal relay device 2 on the exchange 1 side, the occurrence of a failure can be identified. Furthermore, in the case of a failure of the entire data highway, all subscriber lines 6 are cut off at the common terminal relay device 2.

Effects of the Invention As explained above, the present invention provides a function such as a switch circuit 10 for disconnecting the subscriber line at the common terminal relay device 2 for the exchange 1 when the data highway stops operating or a failure occurs. and notifies exchange 1 of an abnormality in the data highway.
An erroneous signal is no longer sent to the exchange 1 due to an abnormality in the data highway, and the exchange 1 is no longer sent a failure signal to a subscriber in which a failure has occurred. That is, there is an advantage that malfunctions in the event of an abnormality in the data highway can be prevented.

[Brief explanation of drawings]

FIG. 1 is an explanatory block diagram of a data highway device, and FIG. 2 is a block diagram of essential parts of an embodiment of the present invention. 1 is an exchange, 2 is a common terminal relay device, 3 is a terminal relay device, 4 is a subscriber, 5 is a data highway,
6 and 7 are subscriber lines, 8 is a power supply, 9 is a ringer generation circuit, 10 is a switch circuit, 10a and 10b are contacts, 11 is a relay, 12 is a termination circuit, 13 is a transistor, and 14 is an alarm signal input terminal. .

Claims (1)

[Claims] 1 comprising an exchange, a common terminal relay device connected to a subscriber trunk of the exchange, and a plurality of terminal relay devices each accommodating a plurality of subscribers, and which connects the common terminal relay device and the terminal relay device in a loop. In a data highway device connected by a data highway, the common terminal relay device is provided with a function of disconnecting the subscriber line to the exchange when the operation of the data highway stops or a failure occurs, A line control method characterized by disconnecting the subscriber line and notifying an abnormality.