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4-18 Configuring the Modem
Configuring
the Modem
Option Set 2—Sync Answering Central Site Without ACU
Changing Default Configuration Settings
Depending on application requirements, you may need to change the following:
• In Option Set 2, the default for network timing is Clock=Internal (AT&X,
MODULATION OPTS category). It may be necessary to change the timing to
external or loopback, depending on the network clocking source.
• In Option Set 2, the default for ACU Select=None. If you want an ACU to
operate the modem, select an ACU and a data format.
• Customize the DTE port as follows:
Set the modem’s DTE rate to match the synchronous DTE’s rate using DTE
Rate (AT
*
DE, TERMINAL OPTS category) (refer to Appendix A for
parameter and setting descriptions.)
• The default Answer option is country-specific. Refer to Appendix C to verify
that this option is appropriate for your application.
• If the DTE does not provide DTR, the modem will not automatically answer an
incoming call. Set DTR=High (AT&D, TERMINAL OPTS category).
Option Set 3—Sync Calls to Central Site, V.25bis ACU
Changing Default Configuration Settings
Depending on application requirements, you may need to change the following:
• In Option Set 3, the default setting for network timing is Clock=Internal
(AT&X, MODULATION OPTS). It may be necessary to change the timing to
external or loopback, depending on the network clocking source.
• In Option Set 3, the default setting for ACU Select=None. If you want an ACU
to operate the modem, select an ACU and a data format.
• Customize the DTE port by selecting this option:
Set the modem’s DTE rate to match the synchronous DTE’s rate using the
DTE Rate option (AT
*
DE, TERMINAL OPTS).
(Refer to Appendix A for parameter and option descriptions.)
• If you plan on using DTR transitions (“DTR Dialing”) to signal the modem to
make a call (rather than issuing commands from an ACU), do the following:
1) Set Default Dial=1 (AT
*
DA, ACU OPTS category).
2) Store a number in memory location 1 (using Enter Phone #, AT&Z,
ATAT 9600 T/D? category).
3) Set DTR=108.1 (AT&D, TERMINAL OPTS category). When DTR is
raised, the modem will dial the specified call.