Line unit interface circuit

Details Line unit interface circuit Line unit interface circuit

1989-12-15

1991-02-12

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 92, 370 851, H04Q 1104

Patent

active

049930192

ABSTRACT:
A line unit interface circuit used on line units in a line shelf of a digital loop carrier provides all of the logic necessary to access two subscriber lines to a line unit interface bus connected to common equipment within the line shelf. Information received from the common equipment includes signaling data, configuration data and provisioning data, which is reconfigured and processed by the line unit interface circuit for controlling the subscriber line channels. Configuration data from the common equipment is decoded to assign time slots on the line unit interface bus to the various channels serviced by the line shelf and to further provide for a timing offset between the transmit and receive strobes provided to each subscriber line circuit. A flywheel circuit is used to prevent erroneous time slot assignment in the event of noise or interference on the line unit interface bus.

REFERENCES:
patent: 4232386 (1980-11-01), McDonald et al.
patent: 4245340 (1981-01-01), Landry
patent: 4455647 (1984-07-01), Gueldner
patent: 4653043 (1987-03-01), Brady
patent: 4849972 (1989-07-01), Hackett et al.

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