7
2-Wire Audio Connections
NOTE: The SSA-424A features internal DC isolation. You
can therefore connect to the SSA-424A to powered TW
cables, and it will not draw any power from the TW system.
2. On the SSA-424A front panel: For System A and System
B, set the 2W CHAN SEL switch to the appropriate
position. To interface to TW channel 1 select position 1;
for TW channel 2, select position 2.
NOTE: If the System A or System B will not be used, set the
2W CHAN SEL switch to the OFF position and attach a
dummy load to the TW XLR connector.
Audiocom Audio Connection
1. You can directly connect standard Audio 1-channel
cables. Connect one Audiocom channel to the J1A
connector on the back of the SSA-424A (System A).
Connect a second Audiocom channel to the J1B
connector (System B). If your Audiocom system uses
2-channel cables, use a JB-2 Junction Box to split the
channels (Figure4 )
NOTE: The SSA-424A features internal DC isolation. You
can therefore connect the SSA-424A to powered Audiocom
cables, and it will not draw any power from the Audiocom
system.
2. On the SSA-424A front panel, set the 2W CHAN SEL
switches for System A or System B to the BAL position.
NOTE: If System A or System B hybrid will not be used, set
the 2W CHAN SEL switch to the OFF position and attach a
dummy load to the TW XLR connector.
Clear-Com Audio Connection
1. Use standard Clear-Com 3-pin cables. Connect one
Clear-Com party line to the J1A connector on the back of
the SSA-424A (System A). Connect a separate Clear-
Com party line to the J1B connector (System B).
NOTE: The SSA-424A features internal DC isolation. You
can therefore connect the SSA-424A to powered Clear-Com
cables, and it will not draw any power from the Clear-Com
system.
2. On the SSA-424A front panel, set the System A and
System B 2W CHAN SEL switches to position 2.
NOTE: If the System A or System B hybrid will not be
used, set the 2W CHAN SEL switch to the OFF position and
attach a dummy load to the TW XLR connector.
Other 2-wire Audio Connection
1. Use the J1A connector on the back of the SSA-424A to
connect one 2-wire line to the System A hybrid. Use the
J1B connector to connect a second 2-wire line to the
System B hybrid. The pin configuration for the J1A and
J1B connectors depend on whether you are connecting a
balanced or unbalanced 2-wire line, as follows:
FIGURE 3. Using a TW-5W to connect to two TW channels to the
SSA-424A
PUSH
AUX
J4B
J3B J2B J1B J1A J2A J3A
J4A
AUX
4WIRE SYSTEM 4WIRE SYSTEM
2WIRE SYSTEM
Telex Communications, Inc., Made in U.S.A.
RTN
+5V RTN
+15V -15V
-15V 0.3A
+15V 1.6A
+5V 3A
J5 POWER
TW-5W
SSA-424A
FROM RTSTW
INTERCOM SYSTEM
TW CABLE PIN-OUT
PIN 1 COMMON
PIN 2 CH 1
PIN 3 CH 2
FIGURE 4. Using a JB-2 Junction Box to split a 2-channel
Audiocom cable into two 1-channel cables.
LINES 1&2LINE 1 LINE 2
JB-2
SSA-424
CH 1 AND 2
FROM AUDIOCOM
INTERCOM SYSTEM
CH 1
CH 2
AUX
J4B
J3B J2B J1B J1A J2A J3A
J4A
AUX
4WIRE SYSTEM 4WIRE SYSTEM
2WIRE SYSTEM
Telex Communications, Inc., Made in U.S.A.
RTN
+5V RTN
+15V -15V
-15V 0.3A
+15V 1.6A
+5V 3A
J5 POWER