SSA-424 USER MANUAL 9
2.4 2-WIRE AUDIO CONNECTIONS

2.4.1 RTS TW AUDIO CONNECTIONS

1 Use standard TW intercom cables. Note, stan-
dard TW system cables can carry either one or
two channels, while each hybrid in the SSA-424
can only interface 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 you TW system cable is carrying
two channels, and you want to connect both, use
a TW-5W or similar device as shown in Fig. 3.
✏The SSA-424 features internal DC isolation.
You can therefore connect the SSA-424 to
powered TW cables, and it will not draw any
power from the TW system.
2 On the SSA-424 front panel: For each hybrid
(System A or 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.
✏If the System A or System B hybrid will not
be used, set its 2W CHAN SEL switch to
either OFF position.

2.4.2 AUDIOCOM AUDIO CONNECTION

1You can directly connect standard Audiocom 1-
channel cables. Connect one Audiocom channel
to the J1A connector on the back of the SSA-424
(System A). Connect a second Audiocom
channelto 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 cn 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 position.
✏If the System A or System B hybrid will not
be used, set its 2W CHAN SEL switch to
either OFF position.
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-424
FROM RTSTW
INTERCOM SYSTEM
TW CABLE PIN-OUT
PIN 1 COMMON
PIN 2 CH 1
PIN 3 CH 2
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
Figure 3. Using a TW-5W to connect two TW channels to the
SSA-424.
Figure 4. Using a JB-2 Junction Box to split a 2-channel
Audiocom cable into two 1-channel cables.