Spare subscriber terminal apparatus

Details Spare subscriber terminal apparatus Spare subscriber terminal apparatus

1982-04-05

1984-05-29

Schreyer, Stafford D.

Multiplex communications

Wide area network

Packet switching

1791752C, 1791753S, 370 16, H04Q 120

Patent

active

044517084

ABSTRACT:
Subscribers (Ab1 to Ab8) in a telecommunications system are normally connected via respective subscriber lines (L1 to L8) to respective subscriber terminals (T1 to T8). Automatic subscriber line test means are connected via a subscriber line test bus (BL) and various relay contacts (r1 to r8 and re1 to re8) to the subscriber lines for testing purposes. Eight subscriber terminals (T1 to T8) populate a single circuit card, thereby constituting a terminal unit (TU1 to TUp). A group of terminal units is associated with a spare terminal unit (TUS). When a faulty terminal unit is detected, it is taken out of service and the spare terminal unit takes over. This is done by switching the subscriber lines connected to the faulty terminal unit over to the test bus. The spare terminal unit is likewise connected to the test bus. To enable the test means to continue testing the remainder of the telecommunications system without being interrupted by the emergency connection via the test bus, isolator means (I) are provided.

REFERENCES:
JP-A-55-115786 (Fujitsu K.K.) Patents Abstracts of Japan, vol. No. 170, Nov. 22, 1980-p. 652 E 35.
Supplement to Electrical Communication, vol. 55, No. 2, 1980 (London) Network Terminal and Control Elements, pp. 24, 30, page 25-right col. line 40 to page 26 left col. line 30.

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