User Instructions
SSA-424
Dual Digital Hybrid
ADAM™, ADAM CS™, Zeus™ Intercom Systems
LEVEL
SET
-1
5
SYSTEM
A
-1
2
-9
-6
-3
0
-10dB
+12dB
0dB
P
O
W
+
E
+4dB
3
R
+
+8dB
6
2
4W LEVEL
REF SEL
+
TO
9
1
4W
+
1
2
BAL
TW C
TO
LEVEL
SET
2W
1
2
BAL
-1
5
SYSTEM
B
-1
2
-9
-6
-3
0
-10dB
+12dB
0dB
+
+4dB
3
+
+8dB
6
4W LEVEL
REF SEL
2
1
+
TO
9
4W
+
1
2
BAL
TW C
TO
2W
1
2
BAL
TM
S
S
A
-4
2
4
9350-7638-000 Rev C 10/04
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Contents
1 Description and Specifications ........................................................................................................5
1.1 GENERAL DESCRIPTION ..................................................................................................................5
1.2 GENERAL FEATURES .......................................................................................................................5
1.3 FRONT AND BACK PANEL DESCRIPTIONS ............................................................................................6
1.3.1 FRONT PANEL .........................................................................................................................6
1.3.2 BACK PANEL ...........................................................................................................................6
1.4 SPECIFICATIONS .............................................................................................................................6
2 Installation .......................................................................................................................................7
2.1 UNPACKING AND INSPECTING ............................................................................................................7
2.2 MOUNTING ....................................................................................................................................7
2.3 4-WIRE AUDIO CONNECTIONS .........................................................................................................7
2.3.1 ADAM, ADAM CS, OR ZEUS AUDIO CONNECTION .....................................................................7
2.3.2 AUDIO CONNECTIONS FOR OTHER 4-WIRE COMMUNICATIONS SYSTEMS .............................................7
2.4 2-WIRE AUDIO CONNECTIONS ..........................................................................................................9
2.4.1 RTS TW AUDIO CONNECTIONS .................................................................................................9
2.4.2 AUDIOCOM AUDIO CONNECTION .................................................................................................9
2.4.3 CLEAR-COM AUDIO CONNECTION .............................................................................................10
2.4.4 OTHER 2-WIRE AUDIO CONNECTION..........................................................................................10
2.5 4-WIRE CALL SIGNAL CONNECTIONS ...............................................................................................11
2.5.1 CALL SIGNAL CONNECTIONS FOR ADAM, ADAM CS, AND ZEUS .................................................11
2.5.2 CALL SIGNAL CONNECTIONS FOR OTHER 4-WIRE COMMUNICATON SYSTEMS ...................................13
2.5.2.1 4-WIRE CALL SEND AND CALL ENABLE/INHIBIT .....................................................................13
2.5.2.2 4-WIRE CALL RECEIVE .....................................................................................................13
2.6 2-WIRE CALL SIGNAL ..................................................................................................................14
2.6.1 CALL SIGNAL CONNECTIONS FOR AUDIOCOM, RTS TW AND CLEAR-COM ......................................14
2.6.2 CALL SIGNAL CONNECTIONS FOR OTHER 2-WIRE COMMUNICATION SYSTEM ....................................14
3 Operation ......................................................................................................................................15
3.1 GENERAL INSTRUCTIONS ...............................................................................................................15
3.2 OPERATING NOTES FOR ADAM, ADAM CS, AND ZEUS INTERCOM SYSTEMS .........................................15
4 Appendix .......................................................................................................................................16
4.1 INTERNAL ACCESS........................................................................................................................16
4.2 MODE DIP SWITCH SETTINGS ........................................................................................................16
4.3 LEVEL DISPLAY CALIBRATION .........................................................................................................16
4.4 CALL SIGNAL OPTION CARD INSTALLATION .......................................................................................17
SSA-424 USER MANUAL 3
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4 SSA-424 USER MANUAL
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Peak Reading Level Meters: Quick and accurate
visual audio level adjustment. No extra setup equip-
ment or guesswork is required.
1
Description and
Specifications
GENERAL DESCRIPTION
1.1
The SSA-424 Dual Digital Hybrid intervaces two, 2-
wire intercom lines to two, 4-wire intercom lines.
Unlike earlier 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 between 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.
Direct ADAM/Zeus Audio Connection: Accepts
standard ADAM/Zeus DB9 or RJ11 keypanel cables.
Transformer Isolated: All audio inputs and outpus
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 SSA-424 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 audio paths
to any of the available types of communication within
the 4-wire system, including intercom ports, camera
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.
Compatible 2-wire intercom systems include RTS™
TW, Audiocom®, and Clear-Com®. Compatible 4-
wire intercom 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 interfac-
ing, the SSA-424 Dual Digital Hybrid assures ease
of setup and maximum transparency between
intercom systems.
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.
Automatically accepts any mains voltage from 100-
250 VAC, 50/60 Hz. Power pack equipped with
locking DIN connector for attachment to the SSA-
424.
1.2 GENERAL FEATURES
Two Independent Hybrids: Interface two separate
2-wire lines to two separate 4-wire lines.
Automatic Nulling: Digital hybrids eliminate all
nulling and ducking adjustments. Quick, trouble-free
setup. Puts an end to concerns about echo and
feedback when interfacing 2-wire lines.
LEVEL
SET
LEVEL
SET
SYSTEM A
SYSTEM B
TO
TO
4W
4W
-15 -12 -9 -6 -3
0
+3 +6 +9 +12
2W CHAN SEL
0
+3 +6 +9
+12
-15 -12 -9 -6 -3
TO
2W
TO
2W
+4dB
2
+4dB
2
2W CHAN SEL
0dB
+8dB
1
BAL
OFF
0dB
+8dB
1
BAL
OFF
-10dB
+12dB OFF
-10dB
+12dB OFF
1
2
BAL
1
2
BAL
TM
4W LEVEL
REF SEL
4W LEVEL
REF SEL
POWER
SSA-424
Telex Communications, Inc., Made in U.S.A.
AUX
AUX
J4A
J3A
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
J4B
J3B
+5V
+15V
RTN
-15V
J1B
J1A
2 WIRE SYSTEM
RTN
J2A
J2B
4 WIRE SYSTEM
4 WIRE SYSTEM
Figure 1. SSA-424 Reference View
SSA-424 USER MANUAL 5
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1.3
FRONT AND BACK PANEL DESCRIPTIONS
1.4
SPECIFICATIONS
1.3.1 FRONT PANEL
2-Wire Ports
Input/Output Impedance: 5,000 ohms, nominal
There is a power ON/OFF and call indicator at the left
of the front panel. This indicator lights continuously
when the SSA-424 is turned on and flashes when an
incoming call signal is detected. The remainder of
the front panel is divided into controls and indicators
for the two separate hybrids, labeled SYSTEM A and
SYSTEM B. For each hybrid, there is a 10-segment,
peak reading level meter to display the 4-wire output
level (TO 4W). There is a recessed level set control
to the left of the 4-wire meter (LEVEL SET) and there
is also a recessed, 5-position range select control for
the 4-wire output (4W LEVEL REF SEL). Under the
4-wire meter, is an identical meter for the 2-wire
output level, and there is a recessed level set control
for the 2-wire output to the left of the meter. Under
the 2-wire meter, there is a recessed, 5-position
selector. The selector has two OFF positions for
when no 2-wire input is connected. The three
remaining switch positions select the 2-wire system
as follows: position 1 selects RTS TW channel 1;
position 2 selects RTS TW channel 2 or a Clear-Com
channel; the BAL position selects an Audiocom
balanced channel. There are 3 LED indicators to
display the current selection (2W CHAN SEL).
Operating Level: -10dBu to 0 dBu, nominal
Level Adjustment Range: ±12dB
4-Wire Ports
Input Impendance: 10k ohms, nominal
Output Impedance: 200 ohms
Operating Levels: -10 dBu, 0 dBu, +4 dBu, +8
dBu, +12 dBu
System to System
Frequency Response:200 Hz to 4.5 kHz, +1/-6dB
S/N Ratio (Ref 1 kHz, 0 dB@2-wire): TBD
Crosstalk: TBD
Environmental
Operating Temp: -20°C to 50°C (-4°F to 122°F)
Storage Temp: -40°C to 85°C (-40°F to 185°F)
Humidity: 0 to 95%, non-condensing
Mains Voltage
100 to 250 VAC, 50/60 Hz
Dimensions
1.72” (44mm) high x 8.19” (208mm) wide x 8.0”
(204mm) deep
1.3.2 BACK PANEL
The power pack connector is located at the right end
of the back panel. This is a locking DIN connector.
The remainder of the back panel is divided into
connectors for the two separate hybrids. Connectors
are labeled with “J” numbers followed fy “A” or “B” to
indicate system A or system B. For each hybrid,
there is an AUX connector. This is used to connect
to/from the optional call signal card. Below the AUX
connector, there are both a DB9F connector and an
RJ11 connector for 4-wire intercom connection.
These are directly compatible with standard ADAM/
Zeus keypanel cables. Next to the 4-wire connectors,
there is a 3-pin female XLR audio connectorfor
connection to the 2-wire intercom system. The pin-
out of this connector is determined by the position of
the TW CHAN SEL control on the front panel.
Weight
5.0 lbs (2.3kg)
Finish
Thermoplastic front panel, almunimum case, light
gray finish
Approvals
UL, CSA, UDE, CE
Specifications subject to change without notice.
6 SSA-424 USER MANUAL
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2.3.2 AUDIO CONNECTIONS FOR OTHER 4-WIRE
COMMUNICATIONS SYSTEMS
1 Construct 9-pin or RJ11 cables to connect from
you 4-wire system to the SSA-424. 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:
2
2.1
Installation
UNPACKING AND INSPECTING
Immediately upon receipt of the equipment, carefully
inspect the shipping container and the contents for
any discrepancies or damage. Should there be any,
notify the freight company and the dealer at once.
The following items are included:
9-Pin Connection
Connector Type (on SSA-424 end of cable): 9-pin
male D-subminiture
Qty
1
1
1
1
Description
SSA-424 Dual Digital Hybrid
Power Pack with cord,100-250 VAC, 50/60Hz
Warranty Card
Pin 1:
Pin 2:
Pin 3:
Pin 4:
No connection
No connection
No connection
Balanced Audio + output (to 4-wire
system)
User Instruction Manual
2.2
MOUNTING
Place the SSA-424 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-424, but allow for ventilation
around the power pack.
Pin 5:
Balanced Audio - output (to 4-wire
system)
Pin 6:
No connection
Pin 7:
Balanced Audio - input (from 4-wire
system)
Pin 8:
system)
Pin 9:
Balanced Audio + input (from 4-wire
No connection
✏ If the SSA-424 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-424 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).
RJ11 Connection
Connector Type (on SSA-424 end of cable):
RJ11 plug
Pin 1:
Pin 2:
No connection
Balanced Audio + input (from 4-wire
system)
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Balanced Audio + output (to 4-wire
system)
Balanced Audio - output (to 4-wire
system)
Balanced Audio - input (from 4-wire
system)
No connection
✏ You may wish to read about the internal
mode DIP switches before mounting the
SSA-424. For further information, see Mode
Switch Settings, page 16.
2.3
4-WIRE AUDIO CONNECTIONS
2.3.1 ADAM, ADAM CS, OR ZEUS AUDIO
CONNECTION
2 On the SSA-424 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.
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-424. Connect from another
port to J2B or J3B (System B connection).
2 On the SSA-424 front panel, set the 4W
LEVEL REF SEL switches to the +8dB posi-
tion.
SSA-424 USER MANUAL 7
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Side-By-Side Rack Mount Configuration Using an MCP1 Rack Mount Kit
Single-unit Rack Mount Configuration Using an MCP2 Rack Mount Kit
Console Mount Configuration Using an MCP3 Console Mount Kit
Tandem Configuration Using an MCP4 Tandem Mount Kit
Figure 2. Rack mount configurations
8 SSA-424 USER MANUAL
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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
(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).
2.4
2-WIRE AUDIO CONNECTIONS
2.4.1 RTSTW 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
✏ 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.
(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.
2 On the SSA-424 front panel, set the 2W CHAN
SEL switches for System A and System B to the
BAL position.
✏ 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.
✏ If the System A or System B hybrid will not
be used, set its 2W CHAN SEL switch to
either OFF position.
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.
CH 1 AND 2
FROM AUDIOCOM
INTERCOM SYSTEM
✏ If the System A or System B hybrid will not
be used, set its 2W CHAN SEL switch to
either OFF position.
L I N E S 1 & 2
L I N E 2
L I N E 1
JB-2
TW CABLE PIN-OUT
PIN 1 COMMON
PIN 2 CH 1
PIN 3 CH 2
FROM RTS TW
INTERCOM SYSTEM
CH 2
CH 1
SSA-424
AUX
PUSH
Telex Communications, Inc., Made in U.S.A.
AUX
J4B
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
TW-5W
J4A
+5V
+15V
RTN
-15V
J1B
J1A
WIRE SYSTEM
J3B
4
J3A
RTN
J2B
WIRE SYSTEM
J2A
2
4
WIRE SYSTEM
Figure 4. Using a JB-2 Junction Box to split a 2-channel
Audiocom cable into two 1-channel cables.
Telex Communications, Inc., Made in U.S.A.
AUX
J4B
AUX
J4A
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
SSA-424
+5V
+15V
RTN
-15V
J1B
J1A
WIRE SYSTEM
J3B
4
J3A
RTN
J2B
WIRE SYSTEM
J2A
2
4
WIRE SYSTEM
Figure 3. Using aTW-5W to connect twoTW channels to the
SSA-424.
SSA-424 USER MANUAL 9
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2.4.3 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-424 (System A). Con-
nect a separate Clear-Com party line to the J1B
connector (System B).
2.4.4 OTHER 2-WIRE AUDIO CONNECTION
1 Use the J1A connector on the back of the SSA-
424 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
depends on whether you are connecting a
balanced or unbalanced 2-wire line:
✏ The SSA-424 features internal CD isolation.
You can therefore connect the SSA-424 to
powered Clear-Com cables, and it will not
draw any power from the Clear-Com system.
Balanced Configuration
Pin 1:
Pin 2:
Pin 3:
No connection
Balanced Audio + Input/Output
Balanced Audio - Input/Output
2 On the SSA-424 front panel, set the System A
and System B 2W CHAN SEL switches to
position 2.
There are two possible configurations for unbal-
anced connection:
✏ If the System A or System B hybrid will not
be used, set its 2W CHAN SEL switch to
either OFF position.
Unbalanced Configuraton 1
Pin 1:
Pin 2:
Pin 3:
Audio Common
Audio + Input/Output
No connection
Unbalanced Configuration 2
Pin 1:
Pin 2:
Pin 3:
Audio Common
No connection
Audio + Input/Output
2 On the SSA-424 front panel, set the CHAN SEL
switches as follows:
• Balanced Configuration: set the CHAN SEL
switches to the BAL position
• Unbalanced Configuration 1: set the CHAN
SEL switches to position 1.
• Unbalanced Configuration 2: set the CHAN
SEL switches to position 2.
✏ If the System A or System B hybrid will not
be used, set its 2W CHAN SEL switch to
either OFF position.
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Table 1. GPI Connector Pin-out
(ADAM, ADAM CS, and Zeus)
2.5
4-WIRE CALL SIGNAL CONNECTIONS
✏ These connections require the call signal
option.
Pin No.
Function
2.5.1 CALL SIGNAL CONNECTIONS FOR ADAM,
ADAM CS, AND ZEUS
You can use the General Purpose Interface (GPI)
connector to interface call signals. The pin-out of the
connector is the same for all of these intercom
systems (Table 1).
1
GPI Input #1 High (5-18 VDC)
GPI Input #2 High (5-18 VDC)
GPI Input #3 High (5-18 VDC)
GPI Input #4 High (5-18 VDC)
GPI Input #5 High (5-18 VDC)
GPI Input #6 High (5-18 VDC)
GPI Input #7 High (5-18 VDC)
GPI Input #8 High (5-18 VDC)
Common*
2
3
4
5
ADAM GPI Connector: XCP-ADAM-MC, J11
ADAM CS GPI Connector: J903
Zeus GPI Connector: J27
6
7
If your intercom system is equipped with a UIO-256
Universal Input/Output Frame, you can also use that
for connections (Tables 2 and 3, page 12).
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Common*
As an alternative to using the GPI, you can use
external components to send and receive call signals
as described in paragraph 2.5.2.
Common*
Common*
Common*
GPI Out #1
Typical GPI connections are shown in Figure 5.
Note, the example uses GPI outputs #1 and #2 and
GPI input #1. You may substitute other GPI inputs
and outputs.
GPI Out #2
GPI Out #3
GPI Out #4
GPI Out #5
IMPORTANT NOTE FOR AZEDIT USERS: AZedit
version 1.06 includes a feature which allows you to
invert the action of the GPI outputs. By default, these
outputs are set to duplicate the actio of the RTS
FR9528 Relay Frame accessory. This is the correct
setting for use with the SSA-424. To check the
AZedit setting, select Intercom Configuration in the
Options menu. Click on the Options tab, then verify
that Configure onboard GPI outputs in FR9528
GPI Out #6
GPI Out #7
GPI Out #8
Common*
Common*
Common*
Common*
mode is selected.
TO SSA-424
*Use any available common pin with any GPI input or
output.
AUX CONNECTOR
(SYSTEM A OR B)
DB9F CABLE CONNECTOR PIN NUMBERS
(View from solder or crimp side)
CLEAR-COM APPLICATION NOTE: IF A
CALL ENABLE/INHIBIT SWITCH IS NOT
USED, A JUMPER MUST BE
1
2
3
4
5
TO GPI IN COMMON
6
7
8
9
INSTALLED TO ENABLE CALL SIGNALING.
THE JUMPER IS NOT REQUIRED FOR
ANY OTHER APPLICATION.
TO GPI IN #1 (4-WIRE CALL RECEIVE INPUT)
FROM GPI OUT #2 (OPTIONAL CALL ENABLE/INHIBIT CONTROL)
FROM GPI OUT #1 (4-WIRE CALL SEND OUTPUT)
GPI OUT COMMON (SEE UIO-256 APPLICATION NOTE)
UIO-256 APPLICATION NOTE: GPI OUT - AT THE UIO-256 END, USE THE NORMAL OPEN (NO) CONTACT
FOR GPI OUT CONNECTION, AND USE THE RELAY COMMON CONTACT FOR THE COMMON CONNECTION.
GPI IN - USE THE INPUT HIGH PIN FOR THE GPI IN CONNECTION, AND USE THE COMMON PIN FOR THE
COMMON CONNECTION.
Figure 5. Call signal connections for ADAM, ADAM CS, or Zeus Intercom Systems. This example usesGPI outputs #1 and #2 and
GPI input #1; however, you may use any other available GPI inputs and outputs. The Call Enable/Inhibit connection is optional. It gives
you the ability to disable call signaling using a GPI output. However, when connecting to a Clear-Com intercom system, if an enable/
inhibit switch is not connected, a jumper must be installed as shown to enable call signaling. The jumper should not be installed for any
other application. Note, you DO NOT have to use GPI outputs for call signaling or call enable/inhibit: you can use simple switches instead
as shown in Figure 6.
SSA-424 USER MANUAL 11
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Table 2. UIO-256 GOI Inputs Connector (J7)
GPI Input Numbers* GPI Input Pin Numbers
UIO-256
Frame #1
UIO-256
Frame #2
UIO-256
Frame #3
UIO-256
Frame #4
Input Hight
(5-18 VDC)
Common
1
2
3
4
17
18
19
20
33
34
35
36
49
50
51
52
9
34
35
36
37
10
11
12
5
6
7
8
21
22
23
24
37
38
39
40
53
54
55
56
13
14
15
16
38
39
40
41
9
25
26
27
28
41
42
43
44
57
58
59
60
1
2
3
4
26
27
28
29
10
11
12
13
14
15
16
29
30
31
32
45
46
47
48
61
62
63
64
5
6
7
8
30
31
32
33
* Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in
the UIO-256 Manual
Table 3. UIO-256 GPI Outputs Connector (J5)
GPI Output Numbers*
Relay Contact Pin Numbers**
Normal
Closed
(NC) Contact
Common
Contact
Normal Open
(NO) Contact
UIO-256 #1
UIO-256 #2
UIO-256 #3
UIO-256 #4
1
2
3
4
17
18
19
20
33
34
35
36
49
50
51
52
38
39
41
42
13
14
16
17
40
15
43
18
44
45
47
48
5
6
7
8
21
22
23
24
37
38
39
40
53
51
55
56
19
20
22
23
46
21
49
24
9
25
26
27
28
41
42
43
44
57
58
59
60
26
27
29
30
1
2
4
5
28
3
31
6
10
11
12
13
14
15
16
29
30
31
32
45
46
47
48
61
62
63
64
32
33
35
36
7
8
10
11
34
9
37
12
* Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in the UIO-256 manual.
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2.5.2 CALL SIGNAL CONNECTIONS FOR OTHER 4-
WIRE COMMUNICATON SYSTEMS
2.5.2.2 4-WIRE CALL RECEIVE
The SSA-424 receives call signals from the 2-wire
system, then converts this to relay contact closure for
use as a 4-wire call receive indication. The SSA-424
also provides +5 VDC which can be connected to the
relay contacts to generate a DC output signal instead
of a contact closure. Connections for simple contact
closure and DC output signal are shown in Figure 7.
2.5.2.1 4-WIRE CALL SEND AND CALL ENABLE/INHIBIT
The SSA-424 accepts a switch-contact input from the
4-wire system and then generates a call signal output
to the 2-wire system. The SSA-424 also accepts an
optional switch contact input to enable or inhibit call
signaling between the 4-wire and 2-wire systems.
Figure 6 shows the typical connections.
✏ The SSA-424 power indicator flashes
whenever a call signal is received from either
2-wire line. This can be used as an incoming
call indication for the 4-wire system, if
DB9F CONNECTOR PIN NUMBERS
(View from solder or crimp side)
CLEAR-COM APPLICATION NOTE:
IF A CALL ENABLE/INHIBIT
desired, and the level display should provide
an indication of which line is calling.
1
2
3
4
5
SWITCH IS NOT USED, A JUMPER
MUST BE INSTALLED TO ENABLE
CALL SIGNALING. THE JUMPER IS
NOT REQUIRED FOR ANY OTHER
APPLICATION.
AUX
CONNECTOR
(SYSTEM A OR B)
6
7
9
8
10 Ohm
5 VDC
PIN 9
CALL ENABLE/INHIBIT
4-WIRE CALL SEND
COMMON
PIN 3
PIN 4
PIN 8
PIN 5
DC COMMON
Figure 6. Typical call send and call enable/inhibit connections
for a 4-wire intercom system.
SSA-424 INTERNAL CIRCUIT FOR CALL SIGNAL
OUTPUT TO 4-WIRE INTERCOM SYSTEM
TO SSA-424 AUX CONNECTOR
DB9F CABLE CONNECTOR PIN NUMBERS
(View from solder or crimp side)
1
2
3
4
5
6
7
9
8
TO 4-WIRE SYSTEM
SIMPLE SWITCH CONTACT CLOSURE TO 4-WIRE
SYSTEM WHEN 2-WIRE SYSTEM CALLS
OPEN CIRCUIT FOR NO CALL
TO SSA-424
AUX CONNECTOR
(SYSTEM A OR B)
DB9F CABLE CONNECTOR PIN NUMBERS
(View from solder or crimp side)
1
2
3
4
5
TO 4-WIRE COMMON
TO 4-WIRE + INPUT
6
7
8
9
+5VDC SIGNAL TO 4-WIRE
SYSTEM WHEN 2-WIRE SYSTEM CALLS
OUTPUT SHORTS TO COMMON FOR NO CALL
Figure 7. Call signal connections for a 4-wire intercom system
other than ADAM, ADAM CS, and Zeus.
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2.6
2-WIRE CALL SIGNAL
2.6.1 CALL SIGNAL CONNECTIONS FOR AUDIOCOM,
RTSTW AND CLEAR-COM
The call signals are superimposed on the audio
signal, so no separate call signal connections are
required. However, make sure that a call enable
switch or jumper is installed for Clear-Com applica-
tions as shown in Figures 5 and 6.
2.6.2 CALL SIGNAL CONNECTIONS FOR OTHER 2-
WIRE COMMUNICATION SYSTEM
Any other 2-wire device must be able to generate
and receive a 20kHz signal superimposed on the
audio as follows:
Balanced Audio Configuration
Pin1:
Pin 2:
Pin 3:
No connection
Balanced 20 kHz + Input/Output
Balanced 20 kHz - Input/Output
SSA-424 Signal Specifications for balanced configu-
ration:
SSA-424 Receive: 20kHz ±100 Hz, 100mV p-p
SSA-424 Send: 20 kHz ±800 Hz, 1V p-p
Unbalanced Configuration 1
Pin 1:
Pin 2:
Pin 3:
20 kHz Common
20 kHz Input/Output
No connection
Unbalanced Configuration 2
Pin 1:
Pin 2:
Pin 3:
20 kHz Common
No connection
20 kHz Input/Output
SSA-424 Signal Specifications for unbalanced
configurations:
SSA-424 Receive: 20 kHz ±100 Hz, 0.3Vrms
SSA-424 Send: 20 kHz ±200 Hz, 100m Vrms
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Another solution is to assign a dedicated key as
a UPL resource key (which you could name
CALL). Then for each key that talks to an SSA-
424 hybrid, create a UPL statement that will
activate (assert) the appropriate GPI whenever
the call key AND the talk key are pressed. This
lets you use the same call key with more than
one GPI. To use this, you simply activate the call
key and the appropriate talk key. Then, when a
verbal response is received, release the call key.
3
3.1
Operation
GENERAL INSTRUCTIONS
1 Attach the power pack to the SSA-424, and apply
power to all components. Confirm that the power
indicator is lit on the SSA-424 front panel.
2 The power indicator flashes when a call signal is
received fron a 2-wire line. The SSA-424 level
displays should help to confirm which line is
calling.
4 Optional call signal input using the GPI
3 Use the level adjust trimmers (Figure 8) to fine
adjust the listen levels.
A. In AZedit, click GPI In on the toolbar.
This opens the GPI Setup screen.
B. Whichever GPI Input you are using for 4-wire
call receive, select that GPI input from the list
(double-click). This will open the Edit GPI
Input window.
C. In the Port Alpha list box, select the intercom
port that you named in step 1.
D. In the Key Number box, type 1. This selects
key 1 at the intercom port that you selected
in step C.
✏ For 4-wire systems other than ADAM, ADAM
CS, and Zeus, you may have to change the
setting of the 4W LEVEL REF SEL control to
establish the correct level. For 2-wire
systems other than Audiocom, TW, and
Clear-Com, you may have to adjust the level
at the 2-wire system if you cannot establish
the correct level with the 2-wire listen level
trimmers.
E. Select Talk Key.
4-WIRE LISTEN LEVEL ADJUSTMENT
F. Click Done.
G. Access keypanel setup, and select the same
intercom port that you selected in step C.
H. Make sure the setup page Main is selected.
I. Assign talk key number 1 to talk to the
intercom port that you setup in step 2. We
also recommend that you assign auto-listen
(AL) to the listen key above that talk key.
LEVEL
SET
LEVEL
SET
SYSTEM A
SYSTEM B
TO
TO
4W
4W
-15 -12 -9 -6 -3
0
+3 +6 +9 +12
2W CHAN SEL
0
+3 +6 +9 +12
2W CHAN SEL
-15 -12 -9 -6 -3
TO
TO
2W
2W
+4dB
2
+4dB
2
0dB
-10dB
+8dB
1
BAL
OFF
0dB
-10dB
+8dB
1
BAL
OFF
+12dB OFF
+12dB OFF
1
2
BAL
1
2
BAL
4W LEVEL
REF SEL
4W LEVEL
REF SEL
TM
POWER
SSA-424
2-WIRE LISTEN LEVEL ADJUSTMENT
Figure 8. Location of level adjust trimmers
3.2
OPERATING NOTES FOR ADAM, ADAM
CS, AND ZEUS INTERCOM SYSTEMS
5 Optional call enable control. If you connected a
GPI output for use as a call enable control, you
can assign that GPi output to any intercom key in
the 4-wire intercom system. If System A is
connected to an Audiocom or TW intercom
system, pressing the key will disable call signal-
ing. (However, the effect is the opposite if a
Clear-Com system is connected: pressing the
key will disable the signaling.)
1 In AZedit use port alpha setup to name each 4-
wire intercom port that is connected to the SSA-
424. Choose names which help indicate which
2-wire line is being interfaced.
2 Key assignment, party line assignment, etc. is
the same as for any other intercom port.
3 Optional call signal output using the GPI: ou can
assign the GPI output to a talk or listen key, then
activate that key to generate a call signal.
6 Send your changes to the intercom system. This
completes any required programming for ADAM,
ADAM CS, or Zeus intercom system.
Another way to generate a call signal is by
assigning the GPI output as a level 2 talk key
assignment for any key that is assigned to talk to
the SSA-424. However, this will cause the call
lights to flash on the 2-wire line during the entire
conversation.
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Table 4. Mode DIP Switch Settings
4
4.1
Appendix
INTERNAL ACCESS
Switch Settings
Description
1
2
3
4
1 Remove six screws from the back cover.
Configuration 1, Half/Full Duplex Mode
(default):
Automatically switches between modes.
Useful in situations where there is high
ambient noise. Also useful when there is
acoustic feedback.
Off
Off
Off
Off
2 Remove the top cover.
This provides access to all internal adjustments.
Configuration 2, Switched Full Duplex Mode:
Switches from half duplex to full duplex 3-9
seconds after conversation begins on the 4-
wire line. Stays in full duplex mode until 60-
90 seconds after conversation ceases. This
helps to keep the line quiet during perdiods of
no conversation, while permitting natural
conversation when people are talking. This is
the preferred operating mode for many
situations, and particularly for fast, close-
coordination, team operations.
3 For option card installation, slide the circuit board
out toward the back to remove it from the bottom
cover.
On
Off
Off
Off
Telex Communications, Inc., Made in U.S.A.
AUX
J4B
J3B
AUX
J4A
J5 POWER
+5V 3A
+15V 1.6A
-15V 0.3A
+5V
+15V
RTN
-15V
Configuration 3, Locked Full Duplex Mode:
Same as configuration 2, but once a hybrid
enters full-duplex mode, it stays in that mode
until power-down.
J1B
J1A
2 WIRE SYSTEM
J3A
RTN
J2A
J2B
4 WIRE SYSTEM
4 WIRE SYSTEM
On
Off
Off
Off
Off
On
On
Off
Figure 9. Location of screws for disassembly.
Configuration4, Half/Full Duplex Mode:
Similar to configuration 1, but with higher
sensitivity.
Half-duplex Definition: Only one side of the line
can talk at a time and the other side must wait until
the first side is done talking before responding.
RV201
RV202
Full-duplex Definition: Both sides of the line can
talk simultaneously.
S301
S302
4.3
LEVEL DISPLAY CALIBRATION
✏ This is a factory preset adjustment and
RV102
RV101
should not require readjustment.
1 On the front panel, set the 4W LEVEL REF SEL
controls to -10dB.
2 Set the 2W CHAN SEL switches to 1.
3 Input a 1kHz, -10dBu test signal at J1A (System
A) or J1B (System B). (Pin 1, signal common;
pin 2, signal high.)
Figure 10. Locations of internal controls.
4.2
MODE DIP SWITCH SETTINGS
4 Adjust RV101 (System A) or RV201 (System B)
while watching the top display (TO4W). All of the
green displays should be lit and no amber
displays should be lit.
S301 controls the operating mode for System B and
S302 controls the operating mode for System A.
Settings are summarized in Table 4
5 Remove the test signal.
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6 Set the 2W CHAN SEL switches to either OFF
position.
4.4
CALL SIGNAL OPTION CARD INSTALLATION
Use these instructions to install a Call Signal Option
Card in an SSA-424 that was originally ordered
without it.
7 Input a 1kHz, -10dBu test signal at the 4-wire
audio input. Use either connector:
9-Pin Connector
Pin 7:Balanced Audio - input
Pin 8:Balanced Audio + input
1 Disassemble the SSA-424 as previously de-
scribed.
2 Assemble the standoffs to the circuit board using
the supplied screws and lockwashers.
RJ11 Connector
Pin 2:Balanced Audio + input
Pin 3:Balanced Audio - input
3 Connect the supplied power cable from J8 on the
option card to J303 on the main board of the
SSA-424.
8 Adjust RV102 (System A) or RV202 (System B)
while watching the bottom display (TO2W). All of
the green displays should be lit and no amber
displays should be lit.
4 Insert the connectors on the option card into the
connectors on the main board.
9 Remove the test signal. This completes the
adjustment.
5 Use the remaining screws and lockwashers to
secure the standoffs to the main board.
6 Reassemble the SSA-424.
Figure 11. The Call Signal Option Card after installation in the
SSA-424.
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