4
AC Power Transformer Connection
Use the following procedure to connect the modem to an ac power outlet:
Procedure
1. Make sure the modem’s power switch is in the Off position.
2. Insert the power transformer’s cylindrical connector into the modem’s rear panel ac
power receptacle labeled POWER.
3. Insert the power transformer into an ac power outlet.
Communications Software Installation
A personal computer commands and controls a dial modem through communications
software. This software, which is installed on the PC, uses the AT command set to
send instructions to the modem. A dumb asynchronous terminal, however, does not
require this software since it can directly send AT commands.
The 3825
Plus
can be used with any major communications software. Refer to your
software’s user’s guide for installation procedures.
Modem Power-Up
Once your modem is properly connected to the DTE, dial or leased lines, and ac outlet,
press the modem’s rear panel power switch to the ON position. The modem begins a
power-up self-test in which all front panel LEDs momentarily light (note that this also
occurs on a reset of the modem), and the Power LED remains ON. The state of other
LEDs depends on your modem’s configuration.
Selecting Factory Configuration Options
After the modem passes the power-up self-test, it can be configured for operation using
one of the factory preset configurations.
The purpose of preset configurations is to simplify the customization your modem.
These factory preset templates contain the most commonly used configuration options
(straps) for Asynchronous Dial, UNIX Dial, and Cellular configurations. Your modem is
shipped from the factory with the Async Dial default configuration options stored in
memory. If UNIX Dial, Cellular (Mobile) or Cellular (PSTN) is more appropriate for your
configuration, then you must change the factory setting as described as follows.
NOTE:
If you have already changed certain configuration options, you may have lost AT
command control. For example, operating in Synchronous mode or disabling AT
commands results in an inability to change configuration options. To regain AT
command control, refer to
Recovering AT Commands
on page 5.
