Installing The Modem - IBM 3746-900 Installation And Maintenance Manual

If any of these items is missing or damaged, contact the place of purchase for
instructions on how to exchange your modem or obtain the missing items.

Installing the Modem

Attention
In order to avoid damages to the unit, before starting the installation, verify the
modem input ac voltage setting against the power voltage source available at
your wall socket.
If needed, the selector switch can easily be moved to the correct position, using
a screwdriver or a pen:
Switch set to 115 V for low-voltage range: 90 - 137 V ac.
Switch set to 230 V for high-voltage range: 180 - 265 V ac.
Step 1. Be sure that the power switch located on the modem rear panel is off
(switch in position "O")
Step 2. If you are going to use a switched line telecommunication cable, plug it
into the PSTN socket located on the modem rear panel. If this modem is
not being installed in the United Kingdom, connect the other end of the
cable to the telecommunication line.
Step 3. If you plan to use a leased line telecommunication cable, plug it into the
LL socket located on the modem rear panel. If this modem is not being
installed in the United Kingdom, connect the other end of the cable to the
telecommunication line.
Step 4. Connect the power attachment cord to the ac power socket located on
the modem rear panel and the power plug to a standard 3-pin grounded
ac outlet. If this modem is being install the United Kingdom, connect the
telecommunication cables you have attached to the modem, to the
telecommunication lines.
Step 5. Observe the modem power-on sequence.
This is the normal power-on sequence:
PWR light is turned on.
SELFTEST RUNNING message is displayed for about 15 seconds.
Set the modem power switch to ON (switch in position "I").
If the PWR light is not on and the voltage selector switch is correctly set
and you are sure the power voltage is present at the wall socket, the
modem is defective and should be replaced.
If the message SELFTEST RUNNING is not appearing on the operator panel
within 10 seconds, the modem is defective and should be replaced. This
message remains on the display for about 15 seconds, then it is changed
by the power-on sequence.
If the modem is set to the factory defaults, the operator panel shows:
AT CMD ec aa
td_ rd_ dsr_ II_
Figure 1-20. 7858 Operator Panel Display
Chapter 1. Installing and Setting Up Your Service Processor
1-23