Nortel Passport 4400 Series Hardware Installation page 110

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Procedure Using a US Robotics Sportster Series Modem
The following is an example of modem configuration using a US Robotics
Sportster Series Modem (other modems will be different, consult your modem
manual).
Configurating the modem requires hardware configuration (dip switches) and
software configuration (AT commands). The chart below lists the hardware
settings.
Switch Number
Use the settings described in the switch setting table, but set the modem to
Smart Mode (hardware switch 8 ON (down).
To configure a US Robotics Sportster Series modem, follow these steps:
1. Connect the PC (or terminal) to the modem. Refer to your modem
2. Start the terminal emulation program.
3. Issue the following sequence of AT commands to the modem to adjust
AT Command
AT&F
ATS0=1
AT&D
ATQ1
ATE0
AT&W
11-4
1 Modem ignores DTR (override)
2 Verbal (word) results
3 Disables result codes
4 Suppresses echo
5 Modem answers on first ring, or higher if
specified in NVRAM
6 Modem sends CD signal when it connects with
another modem, drops CD on disconnect
7 Loads Y or Y1 configuration from user defined
nonvolatile memory (NVRAM)
8 Disables command recognition (dumb mode)
documentation to determine the cabling requirements.
the default settings that may be incorrect (refer to modem documen-
tation).
Description
Set the modem to factory defaults. Refer to your modem
documentation to determine the required format for this
command.
Sets the modem to answer on the first ring.
Ignore DTR (always on)
Do not return result codes.
Echo disabled.
Write and save the current configuration settings.
Table 11-1. Switch Settings
Setting Description
Connecting a Workstation
Required Setting
ON (down)
OFF (up)
OFF (up)
ON (down)
OFF (up)
OFF (up)
OFF (up)
OFF (up)