Direct digital access telecommunication system with signaling bi

Details Direct digital access telecommunication system with signaling bi Direct digital access telecommunication system with signaling bi

1990-11-19

1992-09-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 681, H04J 312, H04J 100

Patent

active

051446243

ABSTRACT:
In a telecommunication system, a circuit is provided for determining the system mode and for restoring converted signalling bits. The circuit is designed to be used in a telecommunication system that lacks frame alignment. The circuit may serve as an trunk line interface located in a Direct Digital Access Office Channel Unit. Alternatively, the circuit may be coupled to a single trunk line which links Customer Premises Equipment (CPE) to the telecommunication system. The detection portion of the circuit determines the system mode of the trunk line connected to a CPE by detecting signalling bits when frame alignment is not maintained. The restoration portion of the circuit restores signalling bits which were converted due to a lack of frame alignment to their pre-converted state.

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patent: 3922495 (1975-11-01), Donohoe
patent: 4059731 (1977-11-01), Green et al.
patent: 4125745 (1978-11-01), Steidl
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patent: 4271509 (1981-06-01), Brolin
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patent: 4636584 (1987-01-01), Binkerd et al.
patent: 4685100 (1987-08-01), Coppens et al.
AT&T Technical Reference TR41458, "Special Access Connections to the Special Access Connections to the AT&T Communications Network for New Service Applications", Oct. 1985.
Bellcore Technical Advisory TA-TSY-000077 Issue 3, "Digital Channel Banks for Dataport Channel Unit Functions", Apr. 1986.

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