Multiplex communications – Wide area network – Packet switching
Patent
1979-06-28
1981-01-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
1791753R, 375 10, H04J 1500, H04B 346
Patent
active
042479347
ABSTRACT:
A loopback testing system for an asynchronously operating fully duplex data transmission path comprising proximate and remote stations, a proximate-to-remote data transmission channel for transmitting data to the remote station at a relatively high maximum data transmission rate, and a remote-to-proximate data transmission channel for transmitting data to the proximate station at a relatively low maximum data transmission rate. A test-waveform generator applies to the proximate station, for transmission along the proximate-to-remote channel, a test waveform presenting a data transmission rate at least approximately equal to the aforementioned higher maximum data transmission rate. A loopback circuit at the remote station receives the thusly transmitted test waveform and reapplies it at the remote station for transmission back to the proximate station along the remote-to-proximate channel. However, the loopback circuit includes a digital frequency divider which reduces the waveform-element transmission rate presented by the test waveform to such a level that the waveform-element duration of the test waveform, as transmitted back to the proximate station, at least approximately corresponds to the aforementioned lower maximum data transmission rate.
REFERENCES:
patent: 3743938 (1973-07-01), Davis
patent: 3920935 (1975-11-01), Vierling et al.
patent: 3937882 (1976-02-01), Bingham
Olms Douglas W.
Striker Michael J.
Te ka De Felten & Guilleaume Fernmeldeanlagen GmbH
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