Spare subscriber terminal device in a digital concentrator

Details Spare subscriber terminal device in a digital concentrator Spare subscriber terminal device in a digital concentrator

1984-11-16

1986-06-10

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 56, 1791753S, H04J 116

Patent

active

045947040

ABSTRACT:
A concentrator is connected to a line test bus (BL) and a terminal test bus (BT) which are common to a plurality of concentrators. A concentrator is constituted by a plurality of terminal units (UT1 to UTm) connected to a spare bus (BS) internal to the concentrator. Each terminal unit includes a plurality of terminals (T1 to Tn) with associated terminal relays (R1 to Rn), a control logic circuit (LOG) and an isolating relay (RI) connected firstly to the spare bus, to the line test bus and to the terminal test bus, and secondly to the terminal relays by line wires (LA1, LA2) and junctor wires (LJ1, LJ2). In one of the terminal units of the concentrator, one of the terminals is a spare terminal (TS) and its associated terminal relay is a spare relay (RS) and the spare relay is directly connected to the spare bus.

REFERENCES:
patent: 4451708 (1984-05-01), Kemler et al.
Supplement to Electrical Communication, vol. 55, No. 2, 1980 (London) Network Terminal and Control Elements, pp. 24-30.

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