Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1992-08-27
1996-01-30
O'Shea, Sandra
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
379 98, H04M 1100
Patent
active
054886538
ABSTRACT:
An apparatus for and a method of permitting the in-band negotiation of enhanced capabilities between two or more facsimile interface units (FIUs) by using FIU capabilities control packets containing a plurality of data cells carrying information of the capability negotiation information is disclosed. In operation, a called station identification signal is transmitted from a remodulating FIU together with a special capabilities packet following the end of a line control packet. The calling FIU may issue a response agreeing to or modifying the compatible enhancements by sending its own special capabilities control packet containing compatibility negotiation information. In another aspect of the present invention, an FIU adds a set of data cells to a line control packet to minimize the possibility of data cell alignment due to degraded channel conditions. In accordance with the present invention, a unique word is selected and transmitted in the set of data cells so as to enhance the system performance and protocol tracking capability of the receiving FIU.
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Dimolitsas Spiros
Onufry, Jr. Michael
Rieser Jack H.
Comsat Corporation
Ning John
O'shea Sandra
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