RTS SSA-324 User manual

System A System B
RTS SYSTEMS SSA324 System Interface
SSA-324
System Interface
(System to System Adapter)
9350697900 Rev G 11/2006

PROPRIETARY NOTICE
The product information and design disclosed herein were originated by
and are the property of Telex Communications, Inc. Telex reserves all
patent, proprietary design, manufacturing, reproduction, use and sales
rights thereto, and to any article disclosed therein, except to the extent
rights are expressly granted to others.
COPYRIGHT NOTICE
Copyright 2006 by Telex Communications, Inc. All rights reserved.
Reproduction, in whole or in part, without prior written permission from
Telex is prohibited.
WARRANTY NOTICE
See the enclosed warranty card for further details.
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
RTS/Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, MN 55337 USA
Telephone: [phone]
Fax: [phone]
RETURN SHIPPING INSTRUCTIONS
Customer Service Department
Telex Communications, Inc. (Lincoln, NE)
Telephone: [phone]
Fax: [phone]
Factory Service: 800-553-5992
Please include a note in the box which supplies the company name,
address, phone number, a person to contact regarding the repair, the type
and quantity of equipment, a description of the problem and the serial
number(s).
SHIPPING TO THE MANUFACTURER
All shipments of product should be made via UPS Ground, prepaid (you
may request from Factory Service a different shipment method). Any
shipment upgrades will be paid by the customer. The equipment should
be shipped in the original packing carton. If the original carton is not
available, use any suitable container that is rigid and of adequate size. If
a substitute container is used, the equipment should be wrapped in paper
and surrounded with at least four (4) inches of excelsior or similar
shock-absorbing material. All shipments must be sent to the following
address and must include the Proof of Purchase for warranty repair.
Upon completion of any repair the equipment will be returned via
United Parcel Service or specified shipper, collect.
Factory Service Department
Telex Communications, Inc.
8601 East Cornhusker Hwy.
Lincoln, NE 68507 U.S.A.
Attn: Service
This package should include the following:

TABLE OF CONTENTS
....................................................
0
PROPRIETARYNOnCE 2
COPYRIGHTNOTICE ..................................................... 2
........................................................
PATeNTNO TICE 2
UNPACKING
AND INSPECTION ............................................... 2
.................................................
WARRANTYINFORMATION 2
RETURN SHIPPINGINSTRUCTIONS ............................................ 2
..................................
SECTION 1; DESCRIPTIONAND SPECIFICATIONS
5
1.2 SPECIFICATONS ..................................................... 5
1.2.1 FUNCTIONALSPECIFICATIONS ......................................... 5
................................................ SECTION 2: INSTALLATION 9
2.1 MECHANICALINSTALLATION ............................................. 9
.............................................2.2 ELECTRICALINSTALLATION 9
i . 8 SECTION S: OPERATION .................................................. 11
3.1 CONTROW: AND CONNECTORS ............................................11
SECTION 7: DIAGRAMS ................................................... 12
SSA324 User Manual 3

TB1-1,2 UlOlA R105 U102A UlOlB
TB1-5,6 U201A R205 U202A U201B
Four
25k
U103B U103A U104A U105 T105 JlOl
U203B U203A U204A U205 T205 J102
Nom
Two
JlOl SlOl
S 105 W103 TI05 U104 B U106 U102C
5201 S201 S205 W203 T205 U204 B U206 U202C
Wire
-+
Output
@=5 mA/volt
Optional
Trans-
former
Buffer
Filter Pir
- Amp -
Two
Figure 1-1
SSA324Block Diagram System Interface (System to System Interface)
-
Buffed
Amplifer
11 dB
-
4 SSA324User Manual
Bilateral
Current
Source
wire
rFt%&TH-t
Input - Unbalanced Reference
Zin=lOk Switch Switch Jumper former
-
Nominal
-
Test LevelFrom [~~~l rt4-wire
-
Null
Circuitry
Duck
Circuitry
Differential
Input Buffer
Amplifier
-
-
Switch
Pickoff
-
RTS (2 Wire)-
Adjust Amplifier 19
dB Driver Transformer Output

SECTION 1: DESCRIPTIONAND SPECIFICATIONS
j)
1.1 DESCRIPTION(See Block Diagram, Figure 1-1)
,
TheModel SSA324 is a System to System Adapter (or inter-
face). It interconnects the voice signals between different
intercom systems. In addition, it can optionallyinterconnect
"Calls" or tally signalsbetween systems. Each SSA324 in-
cludes two two-wire
to four-wire converters. The four-wire
interfacecan deliver and accept high level signals such
as
those from the McCurdy intercom system. An SSA324 can
alsofunctionasatwo-wiretotwo-wireinterfaceby intercon-
necting the two individual interfaces at the four-wire level.
The SSA324carries two voice channelswhen used as adual
two-wiretofour-wireinterface,and onevoice channelwhen
functioningasa two-wire to two-wire interface.
A front panel channel select switch for each of the two
interfaces (A and B) will selectone of two, two-wire chan-
nels. For ClearCom use, theswitch will be in the Channel 2
.
position. For Audiocom use, a rear panel switch will select
balanced two-wire operation.
Front panel controls include
1) adjustments for null, level,
ducking,2) switchesformonitoring and channelselect.
Rear panel controls include balance/unbalance switches for
the two-wire connection of each interface.
Rear panel con-
nectors include two
XLR3 connectors for two-wire, eight
terminals for two four-wire interconections, one
25 pin D
connector for duplicate four-wireconnections plus options
connections. Theterminals
are useful forrapid fieldconnec-
tions. The
D connector aids rapid replacement where mean-
time-to-repair
is an issue and also allowsoption strapping.
TheSSA324replaces theModel TWI224 andTWI222inter-
faces where powering from the intercom is not required.
Differencesbetween theModel TWI224
/ TWI222 interface
and Model SSA324includethe following: 1) The SSA324 is
self (locally) powered, the TWI224 / TWI222 is usually
powered from the
TW lineormay belocallypowered. 2) The
SSA324 has a maximum output at the four-wireoutput port
of +22 dBm, the TWI224
/ TWI222 maximum output is 9
dBm.
ConverterA's two-wireport is driven by an activebalanced
bilateral current source
(an optional transformer may be
added). ConverterB's two-wireport is similarto Converter
A's.
Converter A's four-wireoutput
port is driven by an active
balanced voltagelinedriver (or via an optionaltransformer).
A build-out resistor (about 33 ohms) in each leg of the
differential output maintains stability driving long cables.
Converter B's four-wireoutput port is similar to converter
A's.
The optional transformers can be used to provide higher
common mode voltage isolation between the four-wire sys-
tem(~)andthe two-wiresystems.
ConverterA's four-wireinputport isactivebalanced, biidg-
ing, ten thousand ohmsimpedance. Converter B's four-wire
input port
is similar to converter A's. (An optional trans-
former
is availablefor the four-wireinput(s).
Adjustable, 0
to 30 dB. Toggles from one direction to the
other (thresholdis factory set). There
is one adjustment for
interfaceAand onefor interfaceB. Each interfacehas depth
level adjustment(front panel).
Monitoring
Uses standard headset. Front Panel has six pin female XLR
type headsetconnector.
Switchonfrontpanelactivatesthemonitoringfunction. User
uses headset microphoneor a built in oscillatorto adjust for
null in headsetearphones(orviaa built-in oscillatorwhich is
jumper selectedby ajumper on theprintedcircuitboard).
There
are three null adjustments associated with each two-
wire port. These
are resistive (medium), capacitive (high),
and inductive(low) nulls. Medium, High, and Low refers to
frequencyranges; medium centersabout
1 kilohertz,high, 3
kilohertz, low, 300hertz.
1.2.1 FUNCTIONAL SPECIFICATIONS
The Model SSA324 consists of two two-wire
to four-wire
convertersin a singlepackage (converterAand converter
B).
If the two convertersareinterconnected,theModel SSA324
then functions as two-wire to two-wire converter. The
method of interconnection
is as follows: converterA's four-
wire output is connected to converter B's four-wire input;
converter A's four-wire input is connected to converter B's
output.
There are two level adjustments for interface
A (to-from
two-wire)and two forinterfaceB (to-from two-wire).
SSA324 User Manual
5

Application
TheModel SSA324aljplicationsincludethefollowing:
1Lterfaceaudiosignalsbetween intercom systems
as shownin Table 1-1,below.
Table
1-1
Numberof ChannelsInterfaced with the Model SSA324by System
System2
McCurdy/
Generic4W Audiocom Clearcorn RTS/2WB RTS/2WU RTSI4'WB
2W 2!inhM 2d!Jkd 2W il2ima!
2. Interface(using optional plug in boards) thefollowing non-audio signals:
Audiocom call signalto Audiocom callsignal.
RTS Systemscall signal toRTS Systemscall signal.
RTS Systemscall signal to form Crelay contact transfer.
Audiocom callsignalto form Crelay contact transfer.
Contact closure
to RTS Systemscallsignalgeneration.
Contact closure
to Audiocom callsignalgeneration.
ClearCom to RTS Systemscall and viceversa.
6 SSA324User Manual

13.1 ELECTRICALSPECIFICATIONS
(Specifications
at 120VAClinevoltage)
IndividualInterface Specification
j7/
(each of two dividualinterfaces)
Signal-to-NoiseRatio (Reference: 1kilohertz,0 dBu
at two-wire)
Two-Wireto Four-Wire:
-60 dB
Four-Wireto Two-Wire: -60 dB
Two-WireInput Crosstalk (Reference:
1 kilohertz, 0 dBu)
Impedance:5,000ohms +loo%, -20% singleended,
10,000ohms +100%, -20% differential
Operating Levels:-20 dBu
to +O dBu,nominal
Two-WireOutput
Impedance:5,000 ohms 20% singleended,
10,000ohms 2Wo differential
OperatingLeve1s:O.l
mA to 10 mA, nominal
Four-WireInput
Impedance:10,000ohms minimum singleended,
20,000 ohms minimum differential
Operating Levels:-10 dBu
to +8 dBu, nominal
Four-Wire Output
Impedance:ohms singleended ordifferential
OperatingLevels:-10 dBu
to + 8 dBu,nominal
TransferFunctions(DuckLevel setto no ducking)
Voltage Gain, Four-Wire
In to Two-WireOut*
Level Pot 100% rotation:O 3dB
Level Pot50%rotation:-15 dB 4
dB
TransferFunctions (Duck Level settono ducking)
Voltage Gain, Two-Wire
In to Fow-WireOut**
LevelPot 100%rotation:22
dB 3 dB
LevelPot 50% rotation:8 dB 4 dB
FrequencyResponse (Reference: 1 kilohertz,0 dBu input)
Four-WireInput
to
Two-Wire Output:200 hertz to 5 kilohertz,+1,-4 dB, typical
Two-WireInputto
Four Wire Output:250 hertz
to 5 kilohertz, +1, -4 dB, typical
SystemAto System
B,
Two-wireto Two-wire
200hertzto5 kilohertz: -50 dB,
Environmental
Temperature
Operating:OOto 50' celsius
Storage:-40° to 85O celsius
Humidity0to 95%, non-condensing
MainsVoltage
Standard:120volts lo%, 50-60hertz
*POption:230 volts lo%,50-60hertz
#D 0ption:lOO volts
+ 10%.-5%,50-60hertz
MainsAmperes
StandarkO.2OA
@ 120volts lo%,50-60hertz
*P0ption:O.lOA
@ 230volts 10%.50-60 hertz
#D Option:0.22A @ 100volts + lo%,-5%,50-60hertz
Dimensions
Height:1.72 inches
( 44 millimeters)
Widh8.19 inches(208millimeters)
Deph8.00 inches(204millimeters)
Weight
SSA324***:5.0 pounds (2.3 kilograms)
MCP1:l.O
pounds (0.45 kilograms)
MCP2.1.0
pounds (0.45 kilograms)
Fiish:Thermoplasticfrontpanel, aluminumcase,lightgray finish.
Notes
* Where two-wireoutput voltage isoutputcurrenttimes terminationimpedance, and terminationimpedanceis 200ohms 33nF.
** Null pots setfor maximum null, 200ohm 33nFnominaltwo-wire lie.
*** SSA324weightwith optional transformersinplace.
SSA324 User Manual 7

Figure 2-1
Rear Panel,Model SSA324 SystemInterface
8 SSA324 User Manual

SECTION 2: INSTALLATION
2.1 MECHANICALINSTALLATION
TheModel SSA324can be installedin 3 ways: a singleunit
mounted in a half rack space using an optionalModel MCP2
Kitfor
rack mounting a singleunit; or two SSA324 supplies
mounted sideby side using the optionalMCPl Kit forrack
mounting two units side by side; or
free standing using the
optional MCP8 Kit for adding side channels for non-rack
mounting portableuse.
2.2 ELECTRICALINSTALLATION
Theconnection for the headset used to set-up the interfaceis
on the Eront panel,
all otherconnectionsareon therearpanel.
Figure 2-1 shows the rear panel connections. System A
two-wire connection is at J101, System B, 5102. These are
XLR-3-3
1 (female) type connectors. System A and B four-
wireconnections
are atbothTI31and5103. J103alsocontains
connectionsto theoption card, when installed. Low voltage
alternatingcurrentpower isappliedto5104 (16 volts,AC).
ConnectorPin-outs
are listedbelow.
Two-Wire
(LUJl@
Audiocom ClearCom RTS RTS
*
*
Com 1 1 1 1
*S101(System
B) and/or S102(System A) setto in position
forbalancedoperation.
** If optionboardinstalledandClearCom calllightoperation
is required, movejumper W103 (System A) and/or jumper
W203 (System
B) on motherboard to 2,3 position. Jumper
J103- 7,20forSystemA, andlorJ103- 12,25forSystem B.
System A SystemB
TB 1- TB 1-
Audio In
Hi 1 5
Audio In
Lo 2 6
Audio OutHi 3 7
Audio Out Lo 4 8
Earth 1
16VAC 2
16VAC
3
No Conn. 4
1 Earth
2 4-Wire Audio In Hi, SystemA
15 4-Wire Audio InLo, System
A
3 4-Wire Audio OutHi, System A
16 4-Wire Audio OutLo, System A
4 4-Wire Audio In Hi, SystemB
17 4-Wire Audio InLo, SystemB
5
4-WireAudio OutHi, System B
18 4-Wire Audio OutLo, SystemB
6 Call Send
GND (A)
19 Call SendHi (A)
7 DC CallSigEn
GND (A)
20 DC CallSigEn Hi (A)
8 Relay Contact NO (A)
9 Relay Contact COM (A)
21 Relay Contact
NC (A)
22 Relay Contact NO
(B)
23 Relay Contact COM(B)
10 Relay Contact NC (B)
11 Call Send
GND (B)
24 Call SendHi (B)
12 DC CallSig
En GND (B)
25
DC CallSig En Hi (B)
1
Mic Lo
2 Mic Hi
3 HeadphoneCom
4 LeftHeadphone
Hi
5 Right Headphone Hi
6 No Connection
Placejumper on W2 for tone test signal, W3 for voice test
signal. Test signalused with headsetandfrontpanel nulling
adjustmentsto null
return two-wiresignal.
SSA324User Manual
9

2
f
U
System A System B
CHI-Out '
CH2 - In
I .,,.I NN// Level Nu\\ @I C"