Apparatus and method for supporting analog fax calls in a...

Details Apparatus and method for supporting analog fax calls in a... Apparatus and method for supporting analog fax calls in a...

2006-07-04

2006-07-04

Wallerson, Mark (Department: 2626)

Facsimile and static presentation processing

Facsimile

Auxiliary signal

C358S434000, C455S426100

Reexamination Certificate

active

07072079

ABSTRACT:
Apparatus and methods for supporting analog fax calls between two wireless subscriber stations in a tandem configuration are presented herein. To support the tandem configuration, full duplex communication may be established between the two base stations. Full duplex communication may be realized by incorporating an echo canceler in the base station, or by utilizing both BFSK channels of the V.21 fax system for communication. The tandem configuration may also be supported by advanced flag synchronization, wherein a second base station will immediately start sending preamble flags to a first base station after a message is transmitted from the first base station to the second base station. The first base station may then synchronize its receiver for immediate receipt of the return message from the second base station.

REFERENCES:
patent: 5802483 (1998-09-01), Morris

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