Removing The Model 3921Plus Modem; 392Xplus Modem Power-Up; Selecting Factory Configuration Options - Paradyne COMSPHERE 3920PLUS Technical Reference Manual

Removing the Model 3921Plus Modem

It is not necessary to power down the carrier to remove the Model 3921Plus modem. Perform the
following steps:

392xPlus Modem Power-Up

Once your modem is properly connected to the power supply, leased and/or dial lines, and the
DTE, press the modem's back panel power switch to the ON position. The modem begins a
power-up self-test, in which all DCP LEDs light. 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.
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,

Selecting Factory Configuration Options

After the modem passes the power-up self-test, configure it for operation using one of the six
factory preset configurations.
The 392xPlus modems have six factory preset templates that contain the most commonly used
configuration options (straps) for Synchronous Leased (Answer or Originate), Asynchronous
Leased (Answer or Originate), Trellis Multipoint (Control or Tributary), Asynchronous Dial,
Synchronous Dial, and UNIX Dial hardware network configurations. Your modem ships from the
factory with the Synchronous Leased (Answer) default configuration options stored in memory. If
Synchronous Leased (Originate), Asynchronous Leased (Answer or Originate), Trellis Multipoint
(TMp) (Control or Tributary), Async Dial, Sync Dial, or UNIX Dial is more appropriate for your
3920-A2-GH30-40
When removing the Model 3921Plus modem from the carrier,
always use a ground strap when handling the modem. Always
store the Model 3921Plus modems in an antistatic bag when it
is removed from the carrier.
1. Rotate the circuit pack lock until the release tab is exposed
2. Press down on the release tab and pull the modem away from the carrier's backplane.
Power On Selftst
Passed
F1 F2
Test Branch.
CAUTION
F3
October 1998
Modem Installation
(Figure 2-4).
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