Model 3920Plus Modem Installation; Customer-Supplied Equipment - Paradyne Comsphere 3920Plus Installation And Operation Manual

COMSPHERE 392xPlus Modems
For the carrier-mounted model
If any hardware components are damaged, notify your AT&T Paradyne representative. Return
equipment using the procedures described in the Government Requirements and Equipment Return
section of Chapter 1.

Customer-Supplied Equipment

The following customer-supplied equipment is required to complete a data communications system
using the Model 3920Plus modem:
The following customer-supplied equipment is required for the installation of a Model 3921Plus
modem:
For installation of the COMSPHERE 3000 Series Carrier into a cabinet, refer to the COMSPHERE
3000 Series Carrier, Installation Manual.
Model 3920 Plus Modem Installation
Before installing your standalone modem, make sure your installation site is clean and
well-ventilated. Allow space around the modem for installing cables and telephone cords, and
make sure the modem is located within reach of the ac power outlet. The distance between your
modem and DTE should be minimized if DTE data rates exceed 19,200 bps. Also, low capacitance
cables may be necessary for speeds greater than 19,200 bps or distances greater than 50 feet.
2-2
Installation instructions
Model 3921Plus modem
Two rear connector plates with two DB-25-S edge card connectors on each plate
DTEs with available EIA-232-D serial ports.
Standard EIA-232-D cables with DB-25-P (plug) connectors at one end to attach to the
modem.
One or more of the following modular leased or dial network interfaces:
— JM8 for leased-line applications.
— RJ11C for dial permissive applications.
— One 8-position, 8-wire modular cord (for leased backup purposes).
A COMSPHERE 3000 Series Carrier.
A 50-pin mass termination cable.
One or more of the following modular or 50-pin leased or dial network interfaces:
— RJ11C for single line dial permissive applications.
— RJ21X for multiple line dial permissive applications.
— 66 punchdown block.
One Network Interface Module (NIM) for modems installed in Slots 1–8 and one NIM for
modems installed in Slots 9–16 (required for dial-line applications).
April 1995 3920-A2-GN31-10