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2
Installation
2.1
M
OUNTING
Place the SSA-424A on a desktop, or install it in an
equipment rack using an RTS MCP Rack Mount Kit.
Several rack mount options are available (Figure2,
page 8). There are no special ventilation require-
ments for the SSA-424A, but allow for ventilation
around the power pack.
If the SSA-424A has the call signal option,
the power indicator flashes whenever a call
signal is received from either 2-wire line, and
activity on the level display helps to indicate
which line is calling. If the SSA-424A is
positioned near the 4-wire operator, this can
be used as an incoming call indication for the
4-wire system, if desired (although other
methods are available as described in
paragraph 2.5).
You may wish to read about the internal
mode DIP switches before mounting the
SSA-424A. For further information, see
Mode Switch Settings, page 16.
2.2
4-W
A
IRE
UDIO
2.2.1
ADAM, ADAM CS,
C
ONNECTION
1 Use standard 9-pin or RJ11 keypanel cables.
Connect from one port of your intercom system
to J2A or J3A (System A connection) on the
back of the SSA-424A. Connect from another
port to J2B or J3B (System B connection).
2 On the SSA-424A front panel, set the 4W
LEVEL REF SEL switches to the +8dB posi-
tion.
C
ONNECTIONS
Z
A
OR
EUS
UDIO
2.2.2
A
C
UDIO
ONNECTIONS FOR
C
OMMUNICATIONS
1 Construct 9-pin or RJ11 cables to connect from
you 4-wire system to the SSA-424A. To connect
to the System A hybrid, use either J2A or J3A; for
the System B hybrid, use either J2Bor J3B. Pin
connections are as follows:
9-Pin Connection
Connector Type (on SSA-424A end of cable): 9-
pin male D-subminiture
Pin 1:
No connection
Pin 2:
No connection
Pin 3:
No connection
Pin 4:
Balanced Audio + output (to 4-wire
system)
Pin 5:
Balanced Audio - output (to 4-wire
system)
Pin 6:
No connection
Pin 7:
Balanced Audio - input (from 4-wire
system)
Pin 8:
Balanced Audio + input (from 4-wire
system)
Pin 9:
No connection
RJ11 Connection
Connector Type (on SSA-424A end of cable):
RJ11 plug
Pin 1:
No connection
Pin 2:
Balanced Audio + input (from 4-wire
system)
Pin 3:
Balanced Audio + output (to 4-wire
system)
Pin 4:
Balanced Audio - output (to 4-wire
system)
Pin 5:
Balanced Audio - input (from 4-wire
system)
Pin 6:
No connection
2 On the SSA-424A front panel, set the 4W LEVEL
REF SEL switches to the position which most
closely matches the audio input and output levels
of your 4-wire system. If you don't know the
levels, select +4dB for now.
O
4-
THER
WIRE
S
YSTEMS
SSA-424A U
M
SER
ANUAL
7
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