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ACCULINK 316x DSU/CSU
1-8 December 1996 3160-A2-GB22-10
Carrier-Mounted Model 3161 DSU/CSU
The
3161 DSU/CSU is a circuit card that is installed
into the 3000 Series Carrier. A single carrier can house up
to 16 DSU/CSUs; the DSU/CSUs are controlled by the
carrier’s Shared Diagnostic Control Panel (SDCP), which
can control up to eight carriers. Rear panel connections
are provided by the Auxiliary Backplane, which is
installed on the rear of the carrier.
Model 3161 Front Panel Functions
The
twelve LEDs and six test jacks provided on the
faceplate of the Model 3161 DSU/CSU are the same in
function as those provided on the front panel of the
3160/3164 DSU/CSU (see Figure 1-5). Other front panel
functions, including a keypad and LCD, are provided by
the SDCP of the 3000 Series Carrier
. These SDCP
functions are described in the COMSPHERE 3000 Series
Carrier Installation Manual
.
Model 3161 DSU/CSU Rear Panel
The
Auxiliary Backplane, which is installed on the rear
of the 3000 Series Carrier
, contains the connectors needed
for operation of the 3161 DSU/CSU (see Figure 1-6). This
Auxiliary Backplane can be used by both 3151 CSUs and
3161 DSU/CSUs; some of the connectors shown (i.e., data
port and external clock connectors) apply only to 3161
DSU/CSU applications. The 3161 DSU/CSU connectors
and their functions are listed in Table 1-2.
Net
DSU/CSU
3161
DTR
TXD
RXD
CTS
RTS
OK
Fail
Test
Sig
OOF
Alrm
EER
Sig
OOF
Alrm
PDV
BPV
Select
Net
In
Out
In
Out
In
Out
12
LEDS
6
TEST
JACKS
496-14543-01
Net
Mon
Eqp
Mon
Figure 1-5. 3161 DSU/CSU Faceplate
Table 1-2
Auxiliary Backplane Connectors
Connector Name
Function
DTE A DB15 socket, screw-type connector for T1 DSX-1 (DTE) equipment.
NETWORK A 50-pin, RJ48H plug that provides connection to the T1 network for all eight slots supported by
the Auxiliary Backplane.
CLOCK IN A DB9 socket that attaches an external clock to the DSU/CSU. The external clock provides timing
for up to eight slots. Each Auxiliary Backplane must have its own external clock input.
PORTS 1 and 2 A DB25 socket (EIA-530A) that connects to the synchronous data DTE.
The Port 2 DB25 socket connector allows one slot in the carrier to be configured as the COM port,
which replaces the functionality of the second data port. The COM port is a communications port
that provides access to Front Panel Emulation software running on a locally connected PC or
async terminal connection for DSU/CSU devices on an Async Terminal Interface.
MANAGEMENT An 8-pin modular jack that provides management connectivity between Auxiliary Backplanes in a
carrier.