Telex audiocom SSA-324 REV G User Manual

SSA-324

System Interface

(System to System Adapter)

System B

System A

9350697900 Rev G 11/2006

RTS SYSTEMS SSA324 System Interface

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.

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

CUSTOMER SUPPORT

Te chnical 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).

This package should include the following:

TABLE

OF

CONTENTS

0

PROPRIETARYNOnCE
COPYRIGHTNOTICE
PATeNTNO
UNPACKING
WARRANTYINFORMATION 2

RETURN

SECTION

1.2 SPECIFICATONS .....................................................

SECTION

2.1 MECHANICAL INSTALLATION

SHIPPING INSTRUCTIONS

1;

1.2.1 FUNCTIONAL SPECIFICATIONS

2:

........................................................

TICE

AND

DESCRIPTION AND SPECIFICATIONS

INSTALLATION

....................................................

.....................................................

INSPECTION

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............................................. 2.2 ELECTRICALINSTALLATION

2

2
2
2

2

5

5
5

9

9
9

i

.

8

SECTION

3.1 CONTROW: AND CONNECTORS ............................................ 11

SECTION

S:

OPERATION

7:

DIAGRAMS

..................................................

...................................................

11

12

SSA324

User

Manual

3

TB1-1,2
TB1-5,6

UlOlA
U201A R205

R105 U102A UlOlB

U202A U201B

U103B
U203B

U103A
U203A U204A U205

U104A U105

T105 JlOl
T205 J102

Four

25k
Nom

Filter Pir

S

JlOl SlOl
5201 S201

Two
wire
Input

-

Zin=lO k Switch Switch Jumper former

Nominal

Unbalanced Reference

rFt%&TH-t

105 W103 TI05 U104 B

S205 W203 T205

U204 B

Differential

Input

Buffer

Amplifier

Buffer

-

Amp

U106 U102C
U206 U202C

Null

-

Circuitry

-

-

@=5

Bilateral

Current

Source

mA/volt

Duck

Circuitry

-

-

Optional

Trans-

former

Two
Wire

-+

Output

-

Buffed

Amplifer

11

dB

Test Level From

-

-

Switch
Pickoff

-

RTS (2 Wire)-

Adjust

[~~~l

Amplifier

19

dB

Figure

Driver Transformer Output

1-1

SSA324 Block Diagram System Interface (System

rt4-wire

to

System Interface)

4

SSA324 User

Manual

j)

SECTION

1.1

DESCRIPTION (See

,

The Model SSA324
face). It interconnects the voice signals between different
intercom systems. In addition, it can optionally interconnect
"Calls" or tally signals between systems. Each SSA324 in-
cludes two two-wire
interface can deliver and accept high level signals such
those from the McCurdy intercom system.
also function as a two-wire to two-wire interface by intercon-
necting the two individual interfaces at the four-wire level.

SSA324 carries two voice channels when used as a dual

The
two-wire to four-wire interface, and one voice channel when
functioning as a two-wire to 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
position. For Audiocom use, a rear panel switch will select
balanced two-wire operation.

Front panel controls include
ducking, 2) switches for monitoring and channel select.

Rear
the two-wire connection of each interface.
nectors include two

terminals for two four-wire interconections, one
connector for duplicate four-wire connections plus options
connections. The terminals
tions. The
time-to-repair

The SSA324 replaces the Model TWI224 and TWI222 inter-
faces where powering from the intercom is not required.
Differences between the Model TWI224

and

Model SSA324 include the following:

self (locally) powered, the TWI224 / TWI222 is usually
powered from the
SSA324 has a maximum output at the four-wire output port
of +22 dBm, the TWI224
dBm.

1:

DESCRIPTION AND SPECIFICATIONS

Block

Diagram,

is

a System to System Adapter (or inter-

to

four-wire converters. The four-wire

Figure

An

ClearCom use, the switch will be in the Channel 2

1)

adjustments for null, level,

panel controls include balance/unbalance switches for

Rear

D

connector

is

an issue

XLR3

TW

connectors for two-wire, eight

are

useful for rapid field connec-

aids

rapid replacement where mean-

and

also

allows option strapping.

/

TWI222 interface

1)

The SSA324

line or may be locally powered. 2) The

/

TWI222 maximum output is

1-1)

as

SSA324 can

panel con-

25

pin D

is

Converter A's two-wire port is driven by an active balanced
bilateral current source
added). Converter B's two-wire port is similar to Converter
A's.

Converter A's four-wire output
balanced voltage line driver (or via an optional transformer).
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 transformers can be used to provide higher
common mode voltage isolation between the four-wire sys-
tem(~) and the two-wire systems.

Converter A's four-wire input port is active balanced,
ing, ten thousand ohms impedance. Converter B's four-wire

is

input port
former

.

Adjustable, 0
other (threshold is factory set). There
interface A and one for interface B. Each interface has depth
level adjustment (front panel).

similar to converter A's.

is

available for the four-wire input(s).

to

30

(an

optional transformer may be

port

is driven by an active

(An

optional trans-

dB.

Toggles from one direction to the

is

one adjustment for

Monitoring

Uses standard headset. Front Panel has six pin female
type headset connector.

Switch on front panel activates the monitoring function. User
uses headset microphone or a built in oscillator to adjust for
null in headset earphones (or via a built-in oscillator which is
jumper selected by a jumper on

There

are

three null adjustments associated with each two-

are

wire port. These
and inductive (low) nulls. Medium, High, and Low refers to

9

frequency ranges; medium centers about
kilohertz, low, 300 hertz.

resistive (medium), capacitive (high),

the printed circuit board).

1

kilohertz, high,

biidg-

XLR

3

1.2.1

FUNCTIONAL SPECIFICATIONS

The Model SSA324 consists of two two-wire
converters in a single package (converter A and converter
If the two converters are interconnected, the Model SSA324
then functions as two-wire to two-wire converter. The

is

as

method of interconnection
wire output is connected to converter B's four-wire input;
converter A's four-wire input is connected to converter B's
output.

follows: converter A's four-

to

four-wire

B).

There are two level adjustments for interface
two-wire) and two for interface B (to-from two-wire).

SSA324 User Manual

A

(to-from

5