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1 DESCRIPTION AND SPECIFICATIONS
1.1 GENERAL DESCRIPTION
The SSA-424 Dual Digital Hybrid interfaces two, 2-wire
intercom lines to two, 4-wire intercom lines. Unlike ear-
lier analog hybrids, the SSA-424 features advanced digital
signal processing to achieve automatic nulling of the
2-wire lines. Plus, each hybrid features convenient
peak-reading level meters to quickly match the levels be-
tween the lines that are being interfaced. The result is easy
and accurate setup. With the SSA-424, all need for test
tones, nulling adjustments and ducking adjustments have
been eliminated.
Compatible 2-wire intercom systems include RTS™ TW,
Audiocom®, and Clear-Com®. Compatible 4-wire inter-
com systems include Telex's ADAM™, ADAM™ CS and
Zeus™ Digital Matrix Intercom Systems.
The SSA-424 is also available with optional call signal
interfacing. This option provides bidirectional call signal
compatibility between the 2-wire and 4-wire intercom
systems.
With features like digital signal processing, peak-reading
level meters and optional call signal interfacing, the
SSA-424 Dual Digital Hybrid assures ease of setup and
maximum transparency between intercom systems.
1.2 GENERAL FEATURES
Two Independent Hybrids: Interface two separate
2-wire lines to two separate 4-wire lines.
Figure 1. SSA-424 Reference View
LEVEL
SYSTEM A
SET
-6
-3
0
+9 +12
-15 -12 -9
+3
+6
+4dB
2
2W CHAN SEL
0dB
+8dB
1
BAL
-10dB
+12dB
OFF
OFF
1
2
BAL
POWER
4W LEVEL
REF SEL
Telex Communications, Inc., Made in U.S.A.
AUX
J4B
J1B
J3B
J2B
2 WIRE SYSTEM
4 WIRE SYSTEM
Automatic Nulling: Digital hybrids eliminate all nulling
and ducking adjustments. Quick, trouble-free setup. Puts
an end to concerns about echo and feedback when inter-
facing 2-wire lines.
Peak Reading Level Meters: Quick and accurate visual
audio level adjustment. No extra setup equipment or
guesswork is required.
Direct ADAM / Zeus Audio Connection: Accepts stan-
dard ADAM / Zeus DB9 or RJ11 keypanel cables.
Transformer Isolated: All audio inputs and outputs are
transformer isolated to prevent ground loops and hum.
Call Signal Option: Detects call signals from any of the
compatible 2-wire intercom systems, and then provides a
+5VDC output to the 4-wire intercom system. Accepts a
contact closure input from the 4-wire system and converts
it to the call signal format required by the 2-wire system.
The SSA424 can be directly connected to an ADAM,
ADAM CS, or Zeus GPI (General Purpose Interface). GPI
inputs can be programmed to activate call signals and au-
dio paths to any of the available types of communication
within the 4-wire system, including intercom ports, cam-
era ISO circuits, IFB circuits, etc. GPI outputs can be set
up to place calls only from a specific keypanel within the
4-wire system, or from any keypanel within the 4-wire
system that wishes to call the 2-wire system.
Half-rack Wide, 1RU High: Two SSA-424's fit into a
single rack space. Compatible with RTS TW rack mount
hardware. Can be mixed with other TW equipment.
Universal Power Pack: Ready for worldwide use. Auto-
matically accepts any mains voltage from 100-250 VAC,
50/60 Hz. Power pack equipped with locking DIN con-
nector for attachment to the SSA-424.
LEVEL
SYSTEM B
SET
TO
4W
-15 -12 -9
-6
-3
0
TO
2W
+4dB
2
0dB
+8dB
1
BAL
-10dB
+12dB
OFF
OFF
4W LEVEL
REF SEL
AUX
J4A
J1A
J3A
J2A
4 WIRE SYSTEM
User Instructions, SSA-424 Dual Digital Hybrid 5
TO
4W
+3
+6
+9 +12
TO
2W
2W CHAN SEL
1
2
BAL
TM
SSA-424
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
+5V
RTN
+15V
-15V
RTN
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