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COMSPHERE 392xPlus Modems
1-2 October 1998 3920-A2-GH30-40
COMSPHERE 392xPlus Models
The COMSPHERE 392xPlus modem is available in the following models:
Model 3920Plus standalone singleport modem (model no. 3920-A1-xxx and 3920-A2-xxx).
Model 3920Plus standalone multiport modem (model no. 3920-A1-40x).
Model 3921Plus carrier-mounted singleport modem (model no. 3921-B1-01x).
Model 3921Plus carrier-mounted multiport modem (model no. 3921-B1-00x).
A reference to 392xPlus modems refers to all 3920Plus and 3921Plus models.
Model 3920Plus Standalone Singleport Modems
The Model 3920Plus singleport (Figures 1-1 and 1-2) is a standalone modem capable of either
4-wire/2-wire leased-line or dial operation. This modem is controlled using either AT commands
or the DCP. The DCP consists of a liquid crystal display (LCD), three function keys, four
directional keys, and a row of 13 LED status indicators. For a better understanding of DCP
operation, refer to Chapter 3, DCP Operation.
DIAGNOSTIC
CONTROL
PANEL
LCD AND
KEYPAD
STATUS
INDICATORS
POWER
SUPPLY
97-14678-02
POWER
ON/OFF
LEASED
DIAL
DTE 1
NMS
POWER IN
Figure 1-1. 3920-A2 Standalone Modem
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