Model 3911 - Digicom COMSPHERE 3910 Installation And Operation Manual

COMSPHERE 3900 Series Modems
Carrier-Mounted Model 3911 4-Wire/2-Wire Modem
The carrier-mounted Model 3911 modem (Figure 1-2) is capable of either 4-wire/2-wire
leased-line or dial operation and installs into a COMSPHERE 3000 Series Carrier. The
Model 3911's faceplate has 16 LED status indicators for displaying modem activity and an audio
speaker jack for the carrier's optional speaker.
The Model 3911 modem's rear has two edge card connectors that mount into a connector plate
located on the rear of the carrier. 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
3911
1-4
EIA232/V.24
EDGE CARD
CONNECTOR
FUTURE
USE
Figure 1-2. Model 3911
September 1998
BACK
CONNECTOR
PLATE
EIA232/V.24
CONNECTOR
GROUNDING
TAB
FUTURE
USE
496-14178b
3910-A2-GN32-40