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Appendix D. S-Register List
112 ISU 128 User Manual 61202.029L2-1
S51 LINE CLOCK Selects the clock mode in leased mode.
0 = Slave (default)
1 = Master (Leased line only, limited distance
MODEM application only).
S52 SWITCH Selects the network switch type for dial service.
PROTOCOL 0 = AT&T 5ESS
1 = Northern Telecom DMS-100
2 = National ISDN-1
3 = NEC
S53 CALL TYPE Call type (dial service only)
0 = Speech
1 = Audio
2 = 56 kbps data
3 = 64 kbps data
S54 PROTOCOL Rate adaption protocol type.
TYPE 1 = Clear Channel (no rate adaption)
2 = BONDING mode 1
3 = SAP (simple ADTRAN protocol)
4 = T-link
5 = V.110
6 = V.120
7 = V.34
9 = DSU 57.6 kbps asynchronous
11= FALLBACK
12= PPP async-to-sync
S55 DIAL MODE Selects dialing interface.
0 = Front panel only (always available)
1 = RS-366 dialing port
2 = AT commands
3 = V.25 bis dialing
S56 ECHO TONE Enables an echo tone which suppresses the echo
cancellers 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
1 = Answer
2 = Originate
3 = Both