Telecommunication terminal operating at alternative data throughput rates
AssigneeSociete d'Applications Generales d'Electricite et de Mecanique Sagem
InventorsPhilippe Charbonnier, Pierre Deliveyne, Louis B. Omgba
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Abstract
A switchable data rate ISDN terminal for group G.sub.4 facsimile operation s disclosed. A decoder in the terminal automatically responds to a hexadecimal 7F formed by an extra bit added to the HDLC communications-starting flag when a 64 kb/s system transmits a 56 kb/s communication. The decoder responds by causing a speed controller in the terminal to reduce the effective data transfer rate.
Claims10
A telecommunications terminal connected to an ISDN-type network, said terminal having a full effective data bit transfer rate and a reduced effective data bit transfer rate, said terminal comprising:
- a speed controller, said speed controller providing an effective data bit transfer rate for transmitting and receiving messages;
- and
- recognition means, said recognition means being responsive to a non-standard communications starting flag received by the terminal to cause said speed controller to provide the reduced effective data transfer rate.
Dependencies are inferred from the claim text.