Offset frequency multipoint modem and communications network

Details Offset frequency multipoint modem and communications network Offset frequency multipoint modem and communications network

1990-05-23

1991-09-24

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 8, 455 73, 370 30, 370120, H04B 138

Patent

active

050520245

ABSTRACT:
In a multipoint data communications system used with analog communications channels that may insert undesirable frequency offsets in a modem carrier frequency, a slave modem that adjusts its transmit carrier frequency compensates for the offset influenced communications channel. A central modem device does not have to train up to slightly offset frequencies when the communications channel is effectively removing the offset added by a slave modem at its transmitter site.

REFERENCES:
patent: 2333719 (1943-11-01), Herold
patent: 2819344 (1958-01-01), Thompson
patent: 4075427 (1978-02-01), Mattsson et al.
patent: 4380062 (1983-04-01), Stuart et al.
patent: 4489416 (1984-12-01), Stuart
patent: 4847880 (1989-07-01), Kamerman et al.

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