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Connecting a Workstation Variable Document_Name
11-3
You can use a terminal emulation program or a dumb terminal to configure the
modem. In either case, you must set the serial port baud rate to match that of
the Passport 4400 management port (the default is 9600 baud).
Use your modem documentation and the procedure that follows as a guide to
configuring the modem.
Procedure Using a Hayes-Compatible Modem
To configure a Hayes-compatible modem for Quiet operations, follow these steps:
1. Connect the PC (or terminal) to the modem. Refer to your modem
documentation to determine the cabling requirements.
2. Start the terminal emulation program.
3. Set the serial port baud rate to match that of the Passport 4400
management port (the default is 9600 baud). If the serial connection to
the modem is not made at 9600 bps, then communications will be lost
when connecting the modem to the Passport 4400 management port.
4. Issue the following sequence of AT commands to the modem to adjust
the default settings that may be incorrect (refer to modem
documentation):
5. Once the modem is configured, connect the DB-25 end of the cable
(NTAU17AA) to the null modem cable. Then, connect the null modem
cable to the Hayes-compatible modem (see Figure 11-2 on page 11-2).
The Passport 4400 unit should now be ready to receive calls.
Note:
If your modem doesn’t support the Hayes AT commands,
consult your modem documentation for the procedure for
your particular modem.
AT Command Description
AT&F Set the modem to factory defaults. Refer to your modem
documentation to determine the required format for this
command.
ATS0=1 Sets the modem to answer on the first ring.
AT&D Ignore DTR (always on)
ATQ1 Do not return result codes.
ATE0 Echo disabled.
AT&W Write and save the current settings to NVRAM (nonvolatile
RAM). This retains the configuration through power cycles.
Warning:
!
Inaccurate modem settings and incorrect cabling may cause
interruption of service on the Passport 4400 unit when attempting
to dial in.