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Installation and Setup
EIA-530 Card Installation
The optional EIA-530 card mates with the base card via the three sets of pins that make up connector
A2J1. It can be oriented in either of two positions as shown in
position, the 530 card provides an EIA-530 interface. In the other position it acts as a jumper so that
the V.35 interface can operate.
When the plug-in card is not purchased with the unit, or if it is removed, there must be jumpers or
a program plug on the A and B pins of connector A2J1. The channel interface cannot function if
those pins are left open.
Jumper X1, Network Port Span Power:
Pins 1 + 2: Power not looped to span (Default)
Pins 2 + 3: Power looped to span
Figure 2-5
Note
The SC 553 is not equipped to supply span power. The span power option jumper [X1] shown in
2-5
functions to provide compatibility with spans that are/are not powered from another source. The typ-
ical position for X1 is OUT (i.e., not looped).
076R155-000
Issue 7
When Cascade Adapter is not present,
jumpers must be placed as shown.
Location of Cascade Adapter
076P021-001 when it is installed
on the A1J1 connectors.
X1
1
3
OUT
LOOP
Location of EIA 530 Plug In
048P042-001 when it is installed
on the A2J1 connectors.
SC 553 PC Card, with Option Settings
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Installation Procedures
Figure 2-5
and
X1
1
3
OUT
LOOP
SC 553 No. 076P016-001
Figure
2-6. In one
Figure
2-5
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