Dial restoral method and apparatus

Details Dial restoral method and apparatus Dial restoral method and apparatus

1991-08-12

1995-08-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375222, 370 16, H04J 322

Patent

active

054447046

ABSTRACT:
In a multidrop data communication system operating at a first bit rate using the High-Level Data Link Control (HDLC) protocol, dial restoral of communications with a particular tributary at a second, lower bit rate is accomplished without requiring the system as a whole to back down to that lower bit rate. Specifically, the outgoing data is buffered in the dial restoral modem, which discards the data stored in the buffer upon receipt of the HDLC frame which follows any frame in which the so-called "poll" bit is set.

REFERENCES:
patent: 3676846 (1972-07-01), Busch
patent: 4432087 (1984-02-01), Hubbard
patent: 4759017 (1988-07-01), Allan et al.
patent: 4924456 (1990-05-01), Maxwell et al.
patent: 4952930 (1990-08-01), Franaszek et al.
patent: 5155728 (1992-10-01), Takeuchi et al.
patent: 5276887 (1994-01-01), Haynie
patent: 5301274 (1994-04-01), Li

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