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COMSPHERE 3800 Series Modems
2-8 November 1996 3810-A2-GB30-20
Modem Power-Up
Once your modem is properly connected to the DTE,
dial and/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. This test takes several
seconds to perform, and verifies the operation of most
hardware components within the modem. If successful,
the LCD displays
Power On Selftst Passed
and continues
to the Top-Level menu screen.
F1
Power On Selftst
Passed
F2
F3
If a failure occurs during the self-test, the LCD
displays
Power On Selftst Failed
for several seconds.
The LCD then displays the Top-Level menu screen with
the message
Power on Fail appearing on the top line of
the LCD. Although a failure has occurred, the modem will
attempt to operate. This allows you to activate a more
thorough self-test using the Test branch. Refer to
Chapter 8, T
est Branch
.
Removing and Replacing
Model 3810 and
Model 3820 Modems
To remove and replace a Model 3810 or Model 3820
modem, perform the following steps:
1.
Make sure the modem is of
fline, and press the
modem’s rear panel power switch to the Off
position.
2. Disconnect the power cord from the ac power
outlet, and then from the connector on the rear of
the modem.
3.
Disconnect the dial and leased-line modular cords
from the modem’s rear panel.
4. Disconnect the DTE interface cable from the
modem’s rear panel.
If the modem is to be removed for service, return
it using the procedures on page A in the front of
this document for contact information.
5.
Install the replacement modem as described in the
Model 3810 or Model 3820 Modem Installation
section of this chapter
, and configure it the same
way as the modem being replaced.