Multiplex communications – Special services – Conferencing
Patent
1997-05-07
1999-12-21
Patel, Ajit
Multiplex communications
Special services
Conferencing
370522, H04L 1216, H04J 312
Patent
active
060058463
ABSTRACT:
Apparatus for an improved ISDN terminal adapter (5) and accompanying methods for use therein. The adapter provides automatic ISDN switch detection, automatic SPID configuration, baud rate unblocking and automatic data compression. Specifically, the adapter automatically detects a type of ISDN switch (480) to which the adapter is connected by analyzing D-channel initialization messages which are received by the adapter from the switch as well as specific responses to ISDN messages sent by the adapter. The switch type value is then used, during SPID determination, in conjunction with a telephone area code of the user, to access an internal database (435) of predefined SPID formats, referenced in terms of particular telephone service areas and switch types, to access the possible SPID format(s) for the ISDN switch. Firmware (460) executing within the adapter, in conjunction with software executing within the DTE, forms one of more SPID(s) appropriate for the switch, queries the switch with each of these SPIDs to select and verify a correct SPID from those formed, and, if necessary, further refine and update the switch type previously determined.
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Best Reginald P.
Brennan Daniel M.
Chen Cheng T.
3Com Corporation
Michaelson Peter L.
Patel Ajit
Pizarro Richardo M.
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