DC supply for an S-bus in ISDN

Details DC supply for an S-bus in ISDN DC supply for an S-bus in ISDN

1989-02-09

1990-06-19

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

307 64, 323265, 363 80, H02J 906

Patent

active

049359282

ABSTRACT:
In an ISDN network, terminals connected to an S-bus (4) are fed via this S-bus (4) by a d.c. supply arrangement (6, 7, 20). The d.c. supply arrangement comprises a main supply unit (7) and an emergency supply unit (6) which are coupled with opposite polarity to the S-bus (4) via a coupling circuit (20). Consequently, the emergency supply unit (6) needs to supply only those terminals which are also made suitable for voltages with opposite polarity, and which generally present only elementary telecommunications functions. An electrically arranged coupling circuit (20) includes a monitoring circuit which monitors the value of the main supply unit output voltage and inhibits the output from the main supply unit and connects the emergency supply unit when the output voltage drops below a predetermined threshold.

REFERENCES:
patent: 4638175 (1987-01-01), Bradford et al.
patent: 4805172 (1989-02-01), Barbe et al.
patent: 4812672 (1989-03-01), Cowan et al.

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