Facsimile and static presentation processing – Facsimile – Auxiliary signal
Reexamination Certificate
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
Ebrahimi-Dehkordy Saeid
Nguyen Thien
Tam Kam T.
Wadsworth Phil
Wallerson Mark
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