Model 3921Plus Singleport Modem; Model 3921Plus Singleport Carrier-Mounted Modem - Paradyne COMSPHERE 3920PLUS Technical Reference Manual

COMSPHERE 392xPlus Modems

Model 3921Plus Singleport Carrier-Mounted Modem

The Model 3921Plus singleport is a carrier-mounted modem (Figure 1-3) capable of either
4-wire/2-wire leased-line or dial operation. The modem installs into a COMSPHERE 3000 Series
Carrier, occupying a single slot. The modem's faceplate has sixteen (16) LED status indicators for
displaying modem activity and an audio speaker jack for the carrier's optional speaker.
The modem's back panel has two edge card connectors that mount into a connector plate. This
connector plate has two DB-25-S connectors, one providing an EIA-232-D DTE interface and one
for future functionality.
FACEPLATE
Status
Pwr
Alrm
142 Test
Dial
125 RI
Busy
Serv
SQ
103 TXD
104
RXD
105 RTS
106 CTS
107 DSR
108 DTR
109
LSD
Front Panel
Spkr
3921Plus
1-4
EIA232/V.24
EDGE CARD
CONNECTOR
FUTURE
Figure 1-3. Model 3921Plus Singleport Modem
October 1998
BACK
CONNECTOR
PLATE
USE
496-14178a-04
EIA232/V.24
CONNECTOR
GROUNDING
TAB
FUTURE
USE
3920-A2-GH30-40