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COMSPHERE 3800Plus Modems
2-6 November 1996 3980-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 may
display
Power On Selftst Failed
for several seconds. The
LCD then may display 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
may attempt to operate. If it does, you can activate a more
thorough self-test using the Test branch. Refer to
Chapter 6, T
est Branch
.
If you are not installing a 3811Plus modem, continue
reading at
Selecting Factory Configuration Options
, later
in this chapter.
Removing and Replacing
3810
Plus
and 3820
Plus
Modems
To remove and replace a 3810Plus or 3820Plus
modem, perform the following steps:
1.
Make sure the modem is of
fline, and toggle 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 to the company using the procedures described
in
Government Requir
ements and Equipment
Return near the beginning of this book.
5.
Install the replacement modem as described in the
3810Plus and 3820Plus Modem Installation
section of this chapter
, and configure it the same
way as the modem being replaced.