Circuit arrangement for a centrally-controlled, time-division mu

Details Circuit arrangement for a centrally-controlled, time-division mu Circuit arrangement for a centrally-controlled, time-division mu

1990-03-08

1992-01-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04Q 1104

Patent

active

050797611

ABSTRACT:
Terminal groups are connected to a central switching matrix network via time-division multiplex lines and each comprises a switching matrix sub-network and a group controller which are assigned to one another in pairs. In addition to the connection equipment that are individually assigned to the one and to the other of the two terminal groups and that are respectively connected to the switching matrix sub-network of its own terminal group via internal lines during normal operation and that are switchable to the switching matrix sub-network of the respective other terminal group, the time-division multiplex lines individually extending from the central switching matrix network to each of the terminal groups are also switchable from their own terminal group to the respective partner terminal group. Given switch-over operation, in order to make the dial character receivers and call progress tone generators of a terminal group accessible to the internal lines and time-division multiplex lines of the respective other terminal group which is in the switch-over mode, voice memories working for both transmission directions are respectively doubled in the switching matrix sub-network. Call-associated PCM subinformation are always written into both switching matrix sub-networks in concurrent time slots. Reading is always carried out only from that voice memory that is respectively identified by corresponding, call-associated data in the holding memory.

REFERENCES:
patent: 4320501 (1982-03-01), LeDieu et al.
patent: 4450557 (1984-05-01), Munter
patent: 4763316 (1988-08-01), Schaich et al.
patent: 4841522 (1989-06-01), Yamazaki
patent: 4873694 (1989-10-01), Schmidt et al.
patent: 4901347 (1990-02-01), Schmidt et al.
patent: 4905220 (1990-02-01), Junge et al.

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