Stored program controlled PBX accommodating secondary rate tie t

Details Stored program controlled PBX accommodating secondary rate tie t Stored program controlled PBX accommodating secondary rate tie t

1996-06-14

1998-07-21

Marcelo, Melvin

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370535, H04Q 1104, H04J 304

Patent

active

057843813

ABSTRACT:
In an SPC PBX, a frame bit is inserted at periodic intervals to each of time-slot sequences from output ports of a time switch to form primary rate frames and the frame bit is then removed from each primary rate frame, producing time-slot sequences which are multiplexed and framing bits are inserted to form an outgoing secondary rate frame for transmission. An incoming secondary rate frame is received and framing bits are removed therefrom and demultiplexed into incoming primary rate time-slot sequences. A frame bit is inserted to each of the incoming primary rate time-slot sequences and the frame bit is then removed before being supplied to input ports of the time switch. The frame bit insertion and removal allows the use of current design primary rate interfaces, so that secondary rate interfaces can be installed without altering the operating software of the switch.

REFERENCES:
patent: 4881224 (1989-11-01), Bains
patent: 4958342 (1990-09-01), Williams et al.
patent: 5453989 (1995-09-01), Kitayama et al.
G. Coppadoro et al., "Data Communications In An ISPBX", International Conference on Private Switching Systems and Networks (Conf. Publ. No. 288), pp. 111-116, Jun. 1988.

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