RTS SSA-324 User manual

USER MANUAL
MODELSSA324
System Interface
(System to System Adapter)
OQ
RTSTM
9350 - 6979 - 00 Rev F 6/00

PROPRIETARY NOTICE
Theinformation and design disclosed herein were
originated by and are the property of RTS Systems. RTS
Systemsreservesall patent, proprietary design,
manufacturing,reproduction,use and salesrightsthereto,
and to any articledisclosedtherein, except to the extent
rights are expresslygranted to others.
COPYRIGHT NOTICE
Copyright 1993by RTS Systems. All rights reserved.
Reproduction in whole
or in part withoutprior written
permission from RTS Systems is prohibited.
PATENT NOTICE
This equipment contains and uses a design embodiedin
United StatesPatent No. 4,358,644: “A Bilateral Current
Sourcefor a Multi
- terminalIntercom”. This design
employs a two
- wire to four - wire converter.
UNPACKING AND INSPECTION
Immediatelyupon receipt of the equipment, inspect the
shippingcontainer and the contents carefullyfor any
discrepancies
or damage. Should there be any,notify the
freightcompany and the dealerat once.
WARRANTY INFORMATION
Theproducts of RTS Systems are warranted to be free
from defects in materialsand workmanshipfor a period
of
three years from the date of sale.
RTS Systems soleobligationduring the warranty period
is toprovide, withoutcharge,parts and labor necessary to
remedy covered defectsappearing in productsreturned
prepaid to RTS Systems. This warranty does not cover
any defect, malfunctionor failure caused beyond the
control of RTS Systems,including unreasonable
or
negligent operation,abuse, accident, failureto follow
instructionsin the ServiceManual or the User Manual,
defective
or improperassociated equipment, attemptsat
modification and repair not authorized by RTS Systems,
and shippingdamage. Products with their serial numbers
removed
or effaced arenot covered by this warranty.
To obtain warranty service,follow the proceduresentitled
“ProcedureFor Returns” and “ShippingtoManufacturer
forRepair
or Adjustment”.
This warranty
is the soleand exclusiveexpresswarranty
given with respect to RTS Systems.products. It is the
responsibility of the user
to detemune before purchase
that this product is suitableforthe user’s intended
purpose.
ANY ANDALLIMPLIEDWARRANTIES,
INCLUDING THE
IMPLIED WARRANTY OF
MERCHANTABILITYARE LIMITEDTOTHE
DURATIONOF
THIS EXPRESS LIMITED
WARRANTY.
CUSTOMER SUPPORT
Technicalquestions should be directed to:
Customer ServiceDepartment
RTSRelex
12000Portland Avenue South
Burnsville, MN 55337 U.S.A.
Telephone: (952) 884
- 405 1
Fax: (800) 323 - 0498
RETURNSHIPPING INSTRUCTIONS
PROCEDURE FOR RETURNS
If a repair is necessary, contact the dealer where this unit
was purchased.
If repair throughthe dealer is not possible, obtain a
RETURN AUTHORIZATIONfrom:
Customer ServiceDepartment
Telex Communications,Inc.
Telephone: (877) 863
- 4169
Fax: (800) 323 - 0498
DONOT RETURNANY EQUIPMENT DIRECTLY
TOTHEFACTORY WITHOUT
FIRST
OBTAINING A RETURN AUTHORIZATION.
Be prepared to provide the company name, address,
phone number, a person to contactregarding the repair,
the type and quantity of equipment,a descriptionof the
problemand the serial number(s).
SHIPPINGTOMANUFACTURERFOR REPAIR OR
ADJUSTMENT
All shipmentsof RTS Systemsequipment should
be made
via United Parcel Service or the best availableshipper,
prepaid. The equipment should
be shipped in the original
packing carton; if that is not available,use any suitable
containerthat
is rigid and of adequate size. If a substitute
containeris used, the equipment should
be wrapped in
paper and surroundedwith at leastfour inches
of
excelsior or similar shock - absorbingmaterial. All
shipmentsmust be sentto the following address and must
includethe Return Authorization.
CustomerServiceDepartment
Telex Communications,Incorporated
West 1stStreet
Blue Earth, MN 56013 U.S.A.
Upon completion of any repair the equipmentwill
be
returned via United Parcel Serviceor specifiedshipper
collect.
NEITHER RTS SYSTEMSNOR
THE DEALER WHO
SELLSRTS SYSTEMSPRODUCTS IS LIABLE FOR
INCIDENTAL
OR CONSEQUENTIALDAMAGES OF
ANY KIND.
2 SSA324 User Manual

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TABLE OF CONTENTS
PROPRiETARYNO TI. .................................................... 2
COPYRIGHTNOTICE
..................................................... 2
PATENT NO^ ......................................................... 2
UNPACKINGANDINSP~ON ............................................... 2
WARRANTYINFORMATlON ................................................. 2
FtETURNSHIPPINGINSTRUCTIONS ............................................ 2
SECTION 1; DESCRIPTION AND SPECIFICATIONS .................................. 5
1.1DEs~ON ....................................................... 5
1.2SPEclFICATIONS ..................................................... 5
1.2.1 FWNCTIONAL SPECIFICATIONS .......................................... 5
1.2.2 ETJXTRICAL SPECIFICATIONS ......................................... 7
SECTION 2: INSTALLATION ................................................ 9
2.1 MECHANICALINSTALLATION ............................................. 9
22 ELECTRICALINSTALLATION ............................................. 9
SECTION 3: OPERATION .................................................. 11
3.1 CONTROLS AND CONNECTORS ............................................ 11
3.20PEWTION ........................................................ 11
3.2.1-G ...................................................... 11
3.2.2 LEVELSFITING .................................................. 11
3.2.3DUCKSE~G ................................................... 11
SECTION 7: DIAGRAMS .................................................. 12

TB1-1.2 UlOlA RlO5 UlMA UlOlB U103B U103A U104A
u105 T105
JlOl
TB1-5.6 U201A
R205 U2MA U201B U203B U203A U204A u205
" 205 J102
Four
IVVtfEit
Zin= A~lldB Adjust uitry A~l0dB F~=200Hz F-5 kHz AMdB Source former Output
25k
NOm
LevelTo Two
Uuck Buffer Low Pass Buffer Bilateral
Optional Wire
Current - Trans - -D
Diffl Amp RTS (2 - W) - Circ - Amp -
- Filter -
Amp -
*-5 *dt
JlOl
SlOl
S105
W103
T105 U104 B
u106 u102c
J201 S2Ol S205 W203
" 205
U204 B u206 u2mc
Two
Wire Balanced/ Channel Gnnmd
Optional Differential Null Duck
Input -Unbalanced
- Select - Reference
%=IO k Switch Switch Jmper fonner Amplifier Circuitry Ciatitry
Nominal
- Trans - -Input Buffer - - -
-
UlO7A
S 103 R145
. U207A s203 R245
~
I
Buffed Test Level
From
11 dB Pickoff Adjust
- Amplifer - Switch - RTS (2 Wire)-
U107B u108 TIM
U207B u208
"202 TB1-7.8
TB1-3.4
Figure 1 - 1
SSA324 Block Diagram System Interface(System to System Interface)

SECTION 1: DESCRIPTIONAND SPECIFICATIONS
1.1 DESCRIPTION (See! Block Diagram, Figure 1 - 1)
TheModel SSA324 is a System to SystemAdapter (or inter-
face). It interconnects the voice signals between different
intercom systems.
In addition, it can optionally interconnect
“Calls” or taUy signals between systems. Each SSA324 in-
cludestwo
two - wire to four - wireconverters. The four-wire
interface can deliver
and accept high level signals such as
those from the Mccurdy intercom system. An SSA324 can
alsofunction as atwo - wire to two-wireinterfaceby intercon-
necting the two individual interfaces at the four - wire level.
The
SSA324 des two voice channelswhen used as adual
two
- wire to four-wireinterface,and onevoice channelwhen
functioning
as a two-wireto two-wire interface.
A front panel channel select switch for each of the two
interfaces (A and
B) will select one of two, two - wire chan-
nels. For ClearCom
use, theswitchwill 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) switchesfor monitoring and channelselect.
Rear panel controls include balance/unbalance switches for
the two
- wire ~onne~tionof each interface. Rear panel con-
nectors include two
XLR3 connectors for two-wire, eight
0 terminals for two four-* interconections, one 25 pin D
connector for duplicate four-wire connections plus options
connections. The terminals
are useful forrapid fieldconnec-
tions. The
D connector aids rapidreplacementwhere mean-
time
- to - repair is an issueand also allows option strapping.
The SSA324replacesthe Model
lWI224 and 1wI222 inter-
faces where powering
from the intercom is not required.
Differencesbetween the Model lWI224 / TWI222 interface
and Model
SSA324 include the following: 1) The SSA324 is
self (locally) powered, the TWI224 / TWI222 is usually
powered
from the TW lineormay be locally powered. 2) The
SSA324 has a maximum output at the four-wire output port
of
+22 dBm, the ‘WE224 / TWI222 maximum output is 9
dBm.
1.2SPECIFICATIONS
1.2.1 FUNCTIONAL SPECIFlCATIONS
The Model SSA324 consists of two two - wire to four-wire
convertersin a singlepackage(converterAand converter
B).
If the two converters are interconnected,theModel SSA32A
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.
Converter A’s two - wireport isdriven by an activebalanced
bilateral current
source (an optional transformer may be
added). Converter
B’s two - wire port is similarto Converter
A’S.
Converter A’s four-wireoutput port is driven by an active
balanced voltageline driver (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 - wire output port is similar to converter
A’S.
The optional bansformers can be used to provide higher
common mode voltage isolation between the four-wire sys-
tern@)and the two - wiresystems.
ConverterA’s four-wireinput
port isactivebalanced, bridg-
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 (threshold
is factory set). There is one adjustment for
interface
A andone for interface B. Each interfacehas depth
level adjustment(front panel).
Monitwing
Uses standardheadset. Front Panel has six pin female XLR
type headset connector.
Switchon frontpanel activatesthemonitoringfunction.
User
uses headset microphone or abuilt in oscillator to adjust for
null in headsetearphones(orvia
a built - in oscillatorwhich is
jumper selectedby ajumpex on theprinted circuitboard).
Nulling
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
frequency ranges; medium centersabout 1 kilohertz,high, 3
kilohertz, low,300 hertz.
There
are two level adjustments for interface A (to - from
two - wire) and two for interface B (to-from two - wire).
SSA324 User Manual 5

Application
The Model SSA324 applicationsincludethe following:
1.Interfaceaudio signalsbetween intercom systems as shown in Table 1 - 1,below.
Table
1 - 1
Numberof ChannelsInterfacedwith the Madel SSA324 by System
System
2
McCurdyl
Generic4W Audiocom ClearCom RTSI;?WB RTSDWU RTS14WB
System 1
mlal 2x.Bal2liumd 2!iuM 2"lai-
2.
Interface (using optional plug in boards) the following non - audio signals:
Audiocom call signal to Audiocom callsignal.
RTS Systems call signal to RTS Systemscall signal.
RTS Systems call signal to form C relay contact transfer.
Audiocom call signalto form C relay contact transfer.
Contact closure to RTS Systems call signal generation.
Contactclosure to Audiocom call signalgeneration.
ClearCom to RTS Systemscall and viceversa.

e
1.2.1 ELECTRICALSPECIFICATIONS
(Specifications at 120VAClinevoltage)
IndividualInterface Specification
(each of' two dividual interfaces)
Two
- WireInput
Impedance:5,000 ohms +la%, - 20% singleended,
10,000 ohms +loo%, - 20%differential
OperatingLevels
- 20dBu to +O dBu,nominal
Two - WireOutput
Impedance:5,000 ohms 20% singleended,
10.000 ohms 20%d&erential
OperatingLevelxO.1 mA to 10 mA, nominal
Four - WireInput
Impedance:lO,oOO ohms minimum singleended,
20,000 ohms minimum differential
operatingLevels:-lO dBu to +8 dBu,nominal
Four - WireOutput
Impedance:ohms singleended or differential
OperatingLevels-10dBu
to + 8 dBu,nominal
0 TrierFundions (Duck Level setto no ducking)
Voltage
Gain, Four - Wire In toTwo - Wire Out*
Level Pot 1Wo r0tation:O 3 dB
LevelPot 50% rotation:-15 dB 4 dB
Transfer Fun&= (Duck Level set to no ducking)
Voltage
Gain, Two-WireIn to Four - WireOut**
LevelPot 100%mtation:22
dB 3dB
LevelPot 5090 rotation:8 dB 4 dB
Frequency Response (Reference: 1 kilohertz, 0 dBu input)
Four
- WireInputto
Two - Wire Output:200 hertz to 5 kilohertz,+1,-4 dB, typical
Two-WaeInput to
Four Wire Output:250hertz to 5 kilohertz,+1, - 4 dB,typical
Sinal - to - Noise Ratio (Reference: 1 kilohertz, 0 dBu at two - wire)
TWO-WW to Four-Wire: - 60 dB
F0ur-W~ to Two-Wire: - 60 dB
Crosstalk (Reference: 1 kilohertz, 0 dBu)
System A to System B,
Two - wire to Twewire
200 hertz to 5 kilohertz: - 50 dB,
Environmental
Temperature
0perating:OO to 50 " Celsius
Storage:-40" to 85" Celsius
Humidity:O to 95%. non - condensing
Mains Voltage
Standard:120volts 10%, 50 - 60 hertz
*POpti0n:230volts 10%, 50 - 60 hertz
#D Optiox100volts + 10%. -5%, 50 - 60 hertz
Mains Amperes
Standar&O.UIA @ 120 volts lo%, 50 - 60 hertz
*P Option:O.lOA @ 230volts 10%. 50 - 60 hem
#D OptioxO.22.A @ 100 volts + 1w0.-5%. 50 - 60 hertz
Dimensions
Height 1.72 inches ( 44 millimeters)
Width.8.19 inches (208 millimeters)
Depk8.00inches (204 millimeters)
Weight
SSA324***:5.0 pounds (2.3 kilograms)
MCP1:l.O pounds (0.45 kilograms)
MCp2.1.0 pounds (0.45 kilograms)
FmishThermoplasticfrontpanel, aluminumcase, lightgray finish.
0
Notes:
* Where two - wireoutputvoltage is outputcurrenttimes terminationimpedance, and termination impedance is 200 ohms 33nF.
** Nullpots setformaximumnull, 200 ohm 33nFnominal two - wireline.
*** SSA324 weight with optionaltransformers in place.

Figure 2 - 1
Rear Panel, Model SSA324 SystemInterface
8 SSMM user

SECTION 2: INSTALLATION
0
2.1 MECHANICAL INSTALLATION
-
The Model SSA324 can be installed in 3 ways: a singleunit
mounted
in a half rack space using an optionalModel M82
Kit forrack mounting a singleunit; or two SSA324 supplies
mounted side by sideusing the optional
M81 Kit for rack
mounting two
units side by side; or free standing using the
optional MCF% Kit for adding side channels for non-rack
mounting portable
use.
2.2 ELECTRICAL INSTALLATION
The connectionfor the headset used to set - up the interface is
on the frontpanel, all otherconnections are on the rear panel.
Figure
2 - 1 shows the rear panel connections. System A
two - wire connection is at J101, System B, 5102. These are
XLR-3-31 (female) type connectors. System A and B four-
wireconnectionsareatbothTBlandJ103. J103alsocontains
connections to theoption card,when installed. Low voltage
alternatingcurrentpower isapplied to
J104 (16 volts,AC).
connector
Pin-outs are listed below.
Audimm ClearCom RTS RTS
1 ** *
CHI 23 3 23 2
CH2 - 3
Com 1 1 1 1
*S101 (System B) and/or S102 (System A) set to in position
forbalanced operation.
** If option board installedandCleaKomcalllightoperation
is
required, move jumper W103 (System A) and/or jumper
W203 (System B) on motherboard to 23 position. Jumper
J103- 7,20 for System A, and/or J103- 12,25 forSystem B.
System A
System B
TB 1-
TB 1-
Audio In Hi
1 5
Audio In Lo
2 6
Audio Out
Hi 3 7
Audio Out Lo
4 8
Earth 1
16VAC 2
16VAC 3
NoConn. 4
1
2
15
3
16
4
17
5
18
6
19
7
20
8
9
21
22
23
10
11
24
12
25
Earth
4-Wh Audio In Hi, System A
4 - Wire Audio In Lo, SystemA
4 - Wire Audio Out Hi, System A
4 - Wire Audio Out Lo, System A
4 - Wire Audio In Hi, System B
4 - Wire Audio In Lo, System B
4 - Wire AudioOut Hi, System B
4 - Wire Audio Out Lo, System B
Call SendGND (A)
Call Send Hi (A)
DC CallSig En GND (A)
DCCaUSigEnHi(A)
Relay Contact NO (A)
Relay ContactCOM (A)
Relay Contact NC (A)
Relay ContactNO (B)
Relay Contact COM (B)
Relay ContactNC (B)
Call Send GND (B)
Call Send Hi (B)
DCCallSigEnGND(B)
DCCallSigEnHi(B)
1 Mic Lo
2 Mic Hi
3 Headphone Com
4 Left Headphone Hi
5 Right Headphone Hi
6 No Connection
Place jimper on ~2 for tone test signal, ~3 for voice test
signal. Test signal
used with headsetand front panel nulling
adjustments
to null return two-wire signal.
e -

I
Figure 3 - 1
SSA324 Front Panel
10 SSMN User ~anual

SECTION 3: OPERATION
e
3.1 CONTROLS AND CONNECTORS
Front Panel
switches
1. Channel Selectswitch, CHl out / CH2 in, Sys. A.
2. Press momentary switch fornulling System A
3. Channel Selectswitch, CH1 out / CH2 in, Sys. B.
4. Press momentary switch fornulling System B
Two - wire.
Two
- wire.
connectnrs
5. XLR6-3 1Female 6 pin headset connector
@YN MIC HEADSET)
Contmls
6. Monitor headphone level (VOLUME).
Indicator
7. Indicator(Power) Green LED.
ay LEVEL TO RTS, System A.
-
9. LEVEL FR O M RTS, system A .
10. DUCK Level, System A.
11. Inductive (LOW) null, System A.
12. Resistive (MEDium) null, System A.
13. Capacitive(HIgh)null, System A.
14. LEVEL TORTS,System B.
15. LEVEL FROM RTS wire, System B.
16. DUCK Level, System B.
17. Inductive (Low) null, System B.
18. Resistive mum) null, System B.
19. Capacitive(HIgh)null, System B.
Rear Panel
Switches
3.2 OPERATION
3.2.1 NULLING
PresetControls as Follows:
ToJFrom RTS
SettoMidway
Duck Level Set
to CW
LOW Set to Midway
Med Setto Midway
Hi Setto CCW
Volume
10 O’clock
Press Test Switch
If test signal tone, adjust Med for null, then Hi, then Low.
If test signal voice, say
ahhh into microphone,adjustMed for
null, then Hi, then Low.
ReleaseTestSwitch
3.2.2 LEVEL SETTING
Have Talkers 1 and 2 on Four-Wire System,Talkers 3 and 4
onTwo - WireSystem. AdjustTo/FromRTS Controls so that
all Talkers can hear other at about the samelevel regardless
of which system the
other talkers may be on.
3.23 DUCK SETTING
QukI&Yd
AdjustDuckLevelonlyif fullduplex opemtion is notpossible
becauseof feedback. Adjust Duck Level carefullyfrom
CW
towanis CCW. Onlya very small amount of ducking should
beUSed.
20. Unbalance(Out) Balance (In) / SelectTwo-Wire,
21. . Unbalance (Out) Balance (In) / SelectTwo-Wire,
System
A
System B
ssA324 user Manual 11

SECTION 7: DIAGRAMS
SD6926 B SchematicDiagram - System To System Adapter,Model SSA324, Sht 1 of 3
SD6926 B SchematicDiagram - System To SystemAdapter, Model SSA324, Sht 2 of 3
SD6926 B
SchematicDiagram - System To System Adapter,Model SSA324, Sht 3 of 3
AS6926 B
AssemblyDiagram,PCA, System To System Adapter,Model SSA324
12 SSA324User Manual