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2.4 2-WIRE AUDIO CONNECTIONS
2.4.1 RTS TW Audio Connections
1.
Use standard TW intercom cables. Note that standard
TW system cables can carry either one or two chan-
nels, while each hybrid in the SSA-424 can only inter-
face one TW channel to one 4-wire channel (which
channel is determined by the front panel 2W CHAN
SEL switch). If your TW system cable is only carrying
one channel, or if you only need to connect one of two
channels, connect directly to J1A (System A) or J1B
(System B). If your TW system cable is carrying two
channels, and you want to connect both, use a TW-5W
or similar device as shown in Figure 3.
The SSA-424 features internal DC isolation. You can
therefore connect the SSA-424 to powered TW ca-
bles, and it will not draw any power from the TW
system.
2.
On the SSA-424 front panel: For each hybrid (Sys-
tem A and System B) set the 2W CHAN SEL switch
to the appropriate position. To interface to TW chan-
nel 1, select position 1; for TW channel 2, select po-
sition 2.
If the System A or System B hybrid will not be used,
set its 2W CHAN SEL switch to either OFF position.
TW CABLE PIN-OUT
PIN 1 COMMON
PIN 2 CH 1
PIN 3 CH 2
TW-5W
Telex Communications, Inc., Made in U.S.A.
AUX
SSA-424
J4B
J3B
J2B
4 WIRE SYSTEM
Figure 3. Using a TW-5W to connect twoTW channels
to the SSA424.
FROM RTS TW
INTERCOM SYSTEM
PUSH
AUX
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
J4A
+5V
RTN
+15V
-15V
J1B
J1A
J2A
J3A
RTN
2 WIRE SYSTEM
4 WIRE SYSTEM
2.4.2 Audiocom Audio Connection
1. You can directly connect standard Audiocom
1-channel cables. Connect one Audiocom channel to
the J1A connector on the back of the SSA-424 (Sys-
tem 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 (Figure 4).
The SSA-424 features internal DC isolation. You can
therefore connect the SSA-424 to powered Audiocom
cables, and it will not draw any power from the
Audiocom system.
2.
On the SSA-424 front panel, set the 2W CHAN SEL
switches for System A and System B to the BAL po-
sition.
If the System A or System B hybrid will not be used,
set its 2W CHAN SEL switch to either OFF position.
CH 1 AND 2
FROM AUDIOCOM
INTERCOM SYSTEM
CH 2
Telex Communications, Inc., Made in U.S.A.
AUX
J4B
J1B
J3B
J2B
2 WIRE SYSTEM
4 WIRE SYSTEM
Figure 4. Using a JB-2 Junction Box to split a
2-channel Audiocom cable into two 1-channel cables.
User Instructions, SSA-424 Dual Digital Hybrid 9
JB-2
CH 1
SSA-424
AUX
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
J4A
+5V
RTN
+15V
-15V
J1A
J2A
J3A
RTN
4 WIRE SYSTEM
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