D/I MUX III User's Manual
Card Extender ............................................................................................................................................ 215
External AC Power Supply ......................................................................................................................... 215
Ringing Generator ...................................................................................................................................... 216
APPENDIX G. MODEM INTERFACES ................................................................................................................... 246
General Modem Operation ......................................................................................................................... 246
Hayes Command Set ................................................................................................................................. 246
Special Coastcom Characters .................................................................................................................... 246
NCC Characters........................................................................................................................... 246
D/I Mux III Characters .................................................................................................................. 247
DXC II Characters ........................................................................................................................ 247
V-Series Commands .................................................................................................................................. 254
Modem Considerations............................................................................................................................... 257
Line Noise .................................................................................................................................... 257
Command Timing......................................................................................................................... 257
Modem-To-Modem Sequencing................................................................................................... 257
Modem Control Lines ................................................................................................................... 257
Dial-Out Call Processing ............................................................................................................................ 257
Modems and the NCC System..................................................................................................... 258
Making Connection ...................................................................................................................... 258
Processing Messages .................................................................................................................. 259
Terminating Connection ............................................................................................................... 260
Making Connection ...................................................................................................................... 261
Connection Stabilization............................................................................................................... 262
Processing Messages .................................................................................................................. 262
Terminating Connection ............................................................................................................... 262
224
Modem Dial-Out ......................................................... 268
xvi
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