Apparatus and method for selecting different communication speed

Details Apparatus and method for selecting different communication speed Apparatus and method for selecting different communication speed

1997-04-24

1999-07-27

Ghebretinsae, Temesghen

Pulse or digital communications

Miscellaneous

H04L 2300

Patent

active

059303123

ABSTRACT:
An apparatus and method for automatically selecting different data rates for communicating data over a high bit rate, digital signal line (HDSL) line such as a dry pair line. In one embodiment master/slave interface circuits at opposite ends of a line attempt to establish communications at a higher frequency. If this fails, communications are attempted at a lower frequency. If communications are successful at the higher frequency and communications continue for a predetermined period of time at the higher frequency and then communications fail, an attempt is made to reestablish communications at the higher frequency. An algorithm is set forth for enabling selecting among a plurality of different speeds.

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patent: 4680781 (1987-07-01), Amundson et al.
patent: 4717896 (1988-01-01), Graham
patent: 4780883 (1988-10-01), O'Conner et al.
patent: 4800344 (1989-01-01), Graham
patent: 5524122 (1996-06-01), Lepitre et al.

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