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COMSPHERE 3900 Series Modems
1-4 November 1996 3910-A2-GN32-30
Model 391
1’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
496-14178b
EIA232/V.24
EDGE CARD
CONNECTOR
FUTURE
USE
BACK
CONNECTOR
PLATE
V.35
(3600/3500)
RS366A/V.25
(3800)
EIA232/V.24
TXD
RXD
RTS
CTS
DSR
DTR
LSD
103
104
105
106
107
108
109
Pwr
Alrm
Test
Dial
RI
Busy
Serv
SQ
Status
Front Panel
3911
142
125
Spkr
EIA232/V.24
CONNECTOR
FUTURE
USE
GROUNDING
TAB
Figure 1-2. Model 3911
The
Model 391
1 derives ac power from the COMSPHERE 3000 Series Carrier’
s backplane, which
is a common bus to all devices installed in the carrier
. The user interface to any Model 391
1 is
through the shared diagnostic control panel (SDCP), an optional feature which operates in a