Carrier-Mounted Model 3921Plus 4-Wire/2-Wire Modem - Paradyne Comsphere 3920Plus Installation And Operation Manual

Introduction
Carrier-Mounted Model 3921 Plus 4-Wire/2-Wire Modem
The carrier-mounted Model 3921Plus modem (Figure 1-2) installs into a COMSPHERE 3000
Series Carrier. The Model 3921Plus modem's faceplate covers two slots in the carrier. It has
20 LED status indicators for displaying modem activity and an audio speaker jack for the carrier's
optional speaker.
The Model 3921Plus modem's rear panel has four edge card connectors that mount into two
connector plates. Each connector plate has two DB-25-S connectors providing four EIA-232-DTE
interfaces.
Figure 1-2. Model 3921 Plus
3920-A2-GN31-10 April 1995 1-5