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3-13810-A2-GB30-20 November 1996
Model 3811 Installation
Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 3811 Installation 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing Model 3811 Modems 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
The carrier-mounted Model 3811 modem (Figure 3-1)
is capable of dial or 4-wire/2-wire leased-line operation
and installs into a COMSPHERE 3000 Series Carrier. The
Model 381
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 3811 modem’s rear has two DTE 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 RS-232 DTE
interface and one providing an EIA RS-366A DTE
interface. The Model 3811 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 3811 is through the shared
diagnostic control panel (SDCP), an optional feature
similar to the DCPs on the Model 3810 and Model 3820.
For a better understanding of DCP operation, refer to
Chapter 4,
DCP Operation
.
The COMSPHERE 3000 Series Carrier has a total of
17 slots. The first slot, Slot 0, is reserved for the Shared
Diagnostic Unit (SDU) while the remaining 16 slots can
house up to 16 Model 381
1 modems, or for mixed
networks, a combination of Model 381
1 modems and
Model 361
1 Data Service Units (DSUs). An SDU is a
circuit card that provides SDCP and network management
interfaces to modems and DSUs installed in the carrier.
SDUs are only required if a single SDCP is used by
multiple COMSPHERE 3000 Series Carriers in a cabinet
or if a network management system (NMS) is used.
For more details on the COMSPHERE 3000 Series
Carrier, refer to the
COMSPHERE 3000 Series Carrier
,
Installation Manual.
3