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Appendix D: S-Register List
61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 115
S54.......PROTOCOL Rate adaptation protocol type.
TYPE 1 = Clear Channel (no rate adaptation) (default)
2 = BONDING mode 1
3 = SAP (Simple Asynchronous Protocol)
4 = T-link
5 = V.110
6 = V.120
9 = DSU 57.6 kpbs asynchronous
11 = FALLBACK
12 = PPP
S55.......DIAL MODE Selects dialing interface.
0 = Front panel only (dialing from front panel is al-
ways available) (default)
1 = RS-366 dialing port
2 = AT commands
3 = V.25 bis dialing
S56.......ECHO TONE Enables an echo tone which suppresses the echo can-
cellers in a voice circuit. Can be used to trick the
switch to allow sending data over a line optioned for
voice ISDN service.
0 = None (default)
1 = Answer
2 = Originate
3 = Both
S57.......DDS TEST Allows an ISU 2x64 optioned as a leased line unit to
respond to either DDS inband latching loopback and/
or V.54 loopback commands.
0 = No Rem Lpbks
1 = DDS Accepted
2 = V.54 Accepted (default)
3 = DDS + V.54 Accepted
S58.......CALL SCREENING Allows the ISU 2x64 to screen incoming calls.
0 = Answer any call (default)
1 = Answer only calls from numbers matching
those stored in SN0 through SN9.