Telex audiocom US-2000 REV D User Manual

®

Telex

Operating Instructions

Listen

Talk

Call

Mic Kill

1

Talk

PA

Headset

All Talk

Vox

Side Tone

Panel Mic

R

Volume

US-2000

Listen

Call

2

US-2000
User Station

®

Audiocom

Intercom

System

®

GENERAL

The Audiocom® US-2000 is a microprocessor controlled two-channel
intercom user station, that occupies only 1/2-rack space. The US-2000
can communicate with an entire intercom system or an individual
channel, and can be expanded up to 18 channels. ES-4000 Expansion
Stations can be “daisy chained” to the US-2000 to add four channels at a
time to the intercom system. Each channel can be programmed for talk,
listen or both. The US-2000 can use mono or stereo headsets, or panel
mounted microphone. VOX operation can be selected for either headset
or panel microphone. Internal switch and jumper settings allow the unit
to be used with Clear-Com® components, if desired. Other internal
switch and jumper settings allow the unit to be uniquely configured to the
operator’s requirements.

FCC STATEMENT

This equipment uses, and can radiate radio frequency energy that may
cause interference to radio communications if not installed in accordance
with this manual. The equipment has been tested and found to comply
with the limits of a Class A computing device pursuant to Subpart J, Part
15 of FCC Rules which are designed to provide reasonable protection
against such interference when operated in a commercial environment.
Operation of this equipment in a residential area may cause interference
which the user (at his own expense) will be required to correct.

This product meets the Electromagnetic Compatibility Directive,
89/336/EEC.

OPERATION

SYSTEM POWER

The US-2000 receives power externally, in one of two ways:

· Via the

· Via

®

Clear-Com is a registered trademark of Clear-Com Intercom Systems

® Audiocom is a trademark of Telex Communications, Inc., Minneapolis, Minnesota 55420

12-15 VDC

CHN 1orCHN 2

power input jack

, intercom channel connectors

1

PUSH

4

US-2000

Listen Listen

Mic KillHeadset

Side Tone

Call Call

PAPanel Mic

Vox

12

11 11

18

Talk Talk

PUSH

All Talk

710108 9 12 12

TELEX COMMUNICATIONS, INC. MADE IN USA

6

5

Volume

SPEAKERS

CHN 2

VOL

PGM 2

CHN 1

VOL

PGM 1

17 13161514

1 VRMS

2

LINE LEVEL

1

13

123

PROGRAM

INPUTS

-

+

Figure 1. Front and Rear Panel Controls

2

OUT

P.A. EXP

12-15 VDC

INITIAL US-2000 SETUP

The channel termination is initially set for balanced operation, which is
compatible with other Audiocom® equipment. If the unit is going to be
connected to Clear-Com equipment, two jumpers and one switch must
be changed as described in the section on Clear-Com Setup in this
manual.

The US-2000 is factory set to allow all channels (including those of any
attached ES-4000 units) to be heard through a single powered speaker,
such as the Audiocom® SPK-1000. If the user wants to have each
channel go to a separate powered speaker, three jumpers must be
changed as described in the section on Speaker Setup in this manual.

The headset microphone termination is initially set for unbalanced
operation. To change the headset microphone termination, refer to
Table 2 in this manual for the position of jumper J16. If the termination
requirement of a headset microphone is unknown, the recommended
setting is unbalanced.

MICROPROCESSOR FUNCTIONS

RESET: Simultaneously press
reset the US-2000 microprocessor to its power-up state.

TEST SIGNAL: Simultaneously press
microprocessor to generate 1 kHz test signal. Press any US-2000 or
ES-4000
same
other key on that unit (except

Call

key to send the test signal down that channel. Press the

Call

key to stop the test signal on that channel, then press any

All Talk

and channel 1

All Talk

andPAkeys to cause the

Listen

keys to

Call) to exit the test signal function.

EXTERNAL CONNECTIONS & CONTROLS

NOTE: The numbers refer to the callouts in Figure 1.

1. Mono Headset Connector

This connector accepts a Telex® boom-microphone headset.

2. Panel Microphone or Stereo Headset Connector

This connector accepts a Telex® gooseneck microphone (model
EGM-12N or EGM-18N) or stereo headset.

3

3. VOLUME

Use this control to adjust the headset listen level.

4.

SIDETONE

When using a headset, this control adjusts your own voice level
heard in the earphones. To adjust the level, tap the
once to turn on the headset microphone. Then, use a small
flat-blade screwdriver to increase or decrease your voice level while
talking into the microphone.

5.

VOX

Control

Control

Headset

Level Adjustment

key

There are separate
phone. These adjust the voice level required to activate the micro­phone when VOX mode is on.

To adjust the headset VOX level, place the
in VOX mode (see 6 below). While talking into the headset micro­phone in a normal voice, use a small flat-blade screwdriver to adjust
the

VOX

control to the desired voice activation level. The
microphone key will turn from orange to green as the microphone
turns on.

Use the same procedure to adjust the panel microphone VOX level
using the

6.

Headset

The
key activates the panel microphone. Either key selects one of three
modes of microphone operation:

Latched Mode:

Momentary Mode:

Panel Mic

and

Headset

Tap the key once to turn the headset or panel microphone on.
The key will glow green. Tap the key again to turn the headset
or panel microphone off.

VOX

level controls for headset and panel micro-

Headset

key and

Panel Mic

key activates the headset microphone. The

keys

VOX

level control.

microphone key

Headset

Panel Mic

Press and hold the key to momentarily turn on the headset or
panel microphone. Release the key to turn the headset or panel
microphone off.

4

VOX Mode:

With the headset or panel microphone off, tap the key twice to
turn on VOX mode. The key will glow orange when there is no
audio present, and green when you talk into the headset or
panel microphone. (When in VOX mode you may have to adjust
the

VOX

level.) Tap the key once to turn off VOX mode.

7.

All Talk

The All Talk function allows the user to talk on all attached channels
simultaneously. To activate this function with either the

Panel Mic

US-2000 and ES-4000 channels at once. The key will glow green.

8.

PA

The PA function allows the user to talk over a public address system
that is connected to the rear of the US-2000. With either the

set

public address system connected to the
panel of the US-2000. The key will glow green.

9.

Mic Kill

This key controls three features:

key

key

or

Panel Mic

key

selected, press and hold the

selected, press and hold thePAkey to talk on a

All Talk

P.A.

key to talk on all

output jack on the back

Headset

or

Head-

Microphone Kill Feature:

This feature sends a signal that causes the intercom stations on
a selected channel to turn off any activated microphones on that
channel. (Works with US-2000, ES-4000, SS-1000, BP1000 and
BP2000 stations.) Tap the key once to access this feature. The
key will blink green. To turn off all activated microphones on any
channel, press the
To turn off all microphones on all channels, press the
key. Tap the

Program Kill Feature:

This feature allows the program audio to be individually disabled
on each channel. Press and hold the key to access this feature.
The key will glow green and the current Program Kill status will
be displayed (when a
that channel). Press a

TalkorListen

Mic Kill

key for the desired channels.

key to exit.

Talk

key is lit, program audio is enabled on

Talk

key to enable or disable program au-

5

All Talk

dio on that channel. Tap the
setup.

Headset Audible Call Alert Feature:

This feature will cause an audible beep in the headset whenever
there is an incoming call from any channel. Press and hold the
key to access this feature. The key will glow green and the cur­rent Headset Audible Call Alert status will be displayed (when
both

Call

keys are lit, Headset Audible Call Alert is enabled).

10.

Press either
Alert on both US-2000 channels. Tap the
feature setup.

Talk

keys

Call

key to enable or disable Headset Audible Call

Mic Kill

key to exit the feature

Mic Kill

key to exit the

There is a

Panel Mic

Latched Mode:

Momentary Mode:

11.

Call

The Call function allows the user to signal other devices on the inter­com system. There is a
operate in two ways:

Call receive:

Talk

key for each channel. With either the

selected, the

Tap the key once to talk. The key will glow green. Tap the key
again when finished with a conversation.

Press and hold the key to talk momentarily. Release the key
when finished talking.

keys

When there is an incoming call signal, the key blinks red. (If
Headset Audible Call Alert is enabled, incoming calls will cause a
beep in the headset.) To respond to an incoming call, turn on
the

Talk

key for that channel and begin talking.

Talk

keys operate in two ways:

Call

key for each channel. The

Headset

Call

or

keys

Call send:

To send a call signal to a station on a channel, press and hold
the

Call

key until a verbal response is received. The

6

Listen

key

12.

for that channel automatically turns on when the
pressed.

Listen

keys

Call

key is

There is a
two ways:

Latched Mode:

Momentary Mode:

13.

Program Inputs

In a television studio intercom system, the program input is usually
the actual program audio signal. In another intercom system, the
program input can be any auxiliary audio signal, such as background
music.

There is a separate program input for each channel (see Connector
Pin Configurations for connector details). The
adjusts the program 1 level heard on intercom channel 1. The

PGM 2

nel 2. As supplied, the US-2000 does not interrupt the program in­puts during talk. Program interrupt during talk requires an internal
switch change (see Table 1, switches SW2-4 and SW2-5).

Listen

key for each channel. The

Tap the key once to turn on listen. Tap it again to turn off listen.
The key glows green when listen is on.

Press and hold the key to listen momentarily. Release the key to
turn off listen.

Connector and Program Volume Controls

Listen

keys operate in

VOL PGM 1

control adjusts the program 2 level heard on intercom chan-

control

VOL

14.

12-15 VDC

Normally the US-2000 is powered from the intercom system and will
turn on with the intercom system. The US-2000 may also be pow­ered from an optional Telex® Wall Pack (part number 532006-000).
Plug the Wall Pack into the

15.

P.A.

To use the US-2000 with a public address system, connect this jack
to the input of the public address amplifier.

Input Jack

Output Jack

12-15 VDC

7

jack and into an AC outlet.

16.

EXP OUT

Connects audio and data to the EXP IN jack of an optional Telex®
ES-4000 expansion station.

17.

SPEAKERS

Connects channel audio to the Input jacks of an optional Telex®
SPK-1000 Powered Speaker. May also be connected to the auxil­iary input of an amplifier. These outputs should not be directly con­nected to an unpowered speaker. Refer to the speaker setup
section in this manual.

18.

CHN 1

Each intercom channel has a pair of connectors (one male and one
female) for convenient interconnection of stations. Each pair of con­nectors is wired together in parallel, providing a “loop through” at
each connector pin. Use one connector of each pair to connect to
the intercom power supply. Use the other connector of each pair to
run a cable to another user station.

Jack

Output Jacks

and

CHN 2

Intercom Channel Connectors

CHANNEL TERMINATION

Each channel of the US-2000 must be terminated to prevent audio
oscillations. When a channel is connected to a Telex® power supply,
channel termination is provided within the power supply for that channel.

External channel termination must be installed when a channel is:

· Used in a “dry-line” (non-powered channel) application

· Unused and un-powered

If necessary, install external channel termination by connecting a 300W
resistor across pins 2 and 3 of the intercom channel connector (either

CHN1orCHN2

) at the rear of the US-2000.

INTERNAL SWITCHES, JUMPERS AND ADJUSTMENTS

There are several internal switches, jumpers and adjustments that affect
operation. These are described below. To gain access to the switches,
jumpers and adjustments, remove one screw from the top of the cover
and two screws on each side. Switch, jumper and adjustment locations

8

are shown in Figure 2. The adjustments are also accessible from the
underside of the US-2000, as shown in Figure 3.

SW2

J19

J23

SW1

R198

J22

J21

J24

R187

J20

R188

J7

J8

J17

J16

Figure 2. Internal Switches, Jumpers and Adjustments

NOTE: To activate a changed switch or jumper setting, either

perform a RESET or cycle the power on and off.

9

PROGRAM

INPUTS

+

-

NO

ADJUSTMENT

LIMITER

CHN 1 RETURN

CANCELLATION

CHN 2 RETURN
CANCELLATION

12-15 VDC

P.A. EXP

SPEAKERS

1

OUT

2

LINE LEVEL

0.5 VRMS

VOL

PGM 1

CHN 1

TELEX COMMUNICATIONS, INC. MADE IN USA

PUSH

VOL

PGM 2

PUSH

CHN 2

Figure 3. Adjustments Accessible From the Underside

Clear-Com Setup

Make the following switch and jumper changes when the US-2000 is
used with Clear-Com equipment:

· SW1 (BAL/UNBAL) must be placed in the UNBAL position.

· J17 (Clear-Com/Audiocom® Mic Level Select) must have pins 1 and

2 shorted.

· J21 (DC call enable/disable) must have pins 2 and 3 shorted.

Speaker Setup

Make the following switch and jumper changes to allow the audio from
each channel to go to separate powered speakers:

· J22 must have pins 1 and 2 shorted.

· J23 must have pins 1 and 2 shorted.

· J24 must have pins 2 and 3 shorted.

10

DIP Switches (SW2)

Table 1. SW2 Functions and Settings

SWITCH

NUMBER SWITCH FUNCTION

1 Headset audible key press

2 Mic Kill on/off (Enables/disables

3 Channel 1 20-kHz call/send

4 Channel 2 Program Interrupt

5 Channel 1 Program Interrupt

6 Left Earpiece Source

7 Right Earpiece Source

8 Channel 2 20-kHz call/send

DEFAULT

SETTING

Off
beep on/off
On: No beep
Off: Beep activated

On
another user station from killing
the microphone on this station)
On: Mic kill enabled
Off: Mic kill disabled

On
On: Enable 20 kHz signalling
Off: Disable 20 kHz signalling

Off
On: Program interrupted

during talk

Off: No program interrupt

Off
On: Program interrupted

during talk

Off: No program interrupt

On
On: Both channels
Off: Channel 2 only

On
On: Both channels
Off: Channel 1 only

On
On: Enable 20 kHz signalling
Off: Disable 20 kHz signalling

NOTE:

The Program Interrupt feature individually controls the program
audio for each channel. When the Program Interrupt feature is
enabled, program audio is shut off on that channel when the

Talk

key is pressed. If the Program Kill feature is enabled for a chan­nel, the Program Interrupt feature will have no effect on that
channel.

11

Balanced/Unbalanced Switch (SW1)

Set this switch to the balanced (BAL) position to use the US-2000 with
Audiocom® intercom channels. Set the switch to the unbalanced
(UNBAL) position for use with a Clear-Com® intercom system. (The
factory default setting is the balanced position for use with Audiocom®.)

Table 2. Jumper Functions And Settings

JUMPER

NUMBER JUMPER FUNCTION

J7 Program 1 Local Listen

Both pins shorted: Program 1 audible in local
headset or speaker during CH1 listen
No pins shorted: Program audio not audible

J8 Program 2 Local Listen

Both pins shorted: Program 2 audible in local
headset or speaker during CH2 listen
No pins shorted: Program audio not audible

J16 Balanced/Unbalanced Headset Mic Select

Pins 1&2 shorted: Unbalanced
Pins 2&3 shorted: Balanced

J17 Clear-Com / Audiocom Mic Level Select

Pins 1&2 shorted: Clear-Com
Pins 2&3 shorted: Audiocom

J19 Channel 1 20-kHz Call Receive enable/disable:

Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled

J20 Channel 2 20-kHz Call Receive enable/disable:

Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled

J21 DC Call enable/disable: Makes the US-2000 compatible with

Clear-Com DC call signalling

Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled

J22 Multi-Channel Speaker enable/disable:

Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled

J23 Single Channel Speaker enable/disable:

Pins 1&2 shorted: Enabled
Pins 2&3 shorted: Disabled

J24 Multi-Channel Speaker Sidetone enable/disable:

Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled

DEFAULT

SETTING

No pins
shorted *

No pins
shorted *

Pins 1&2
shorted

Pins 2&3
shorted

Pins 2&3
shorted

Pins 2&3
shorted

Pins 1&2
shorted

Pins 2&3
shorted

Pins 2&3
shorted

Pins 1&2
shorted

* For no pins shorted, the jumper is placed on one pin only.

12

Adjustments

The following adjustments are accessible either internally (refer to Figure

2) or from the underside of the US-2000, as shown in Figure 3.

Return Cancellation Adjustments (R187, R188)

Adjusted at the factory to cancel audio output that may be re­flected from the line. There is a separate adjustment for each
channel. The Return Cancellation should only require adjust­ment when the channel impedance or capacitance changes sig­nificantly. To adjust one channel; connect powered speaker (set
for full volume), enable TEST SIGNAL on desired channel, and
adjust appropriate Return Cancellation to minimize signal volume
on the speaker.

Limiter Adjustment (R198)

Adjusted at the factory for 1 Vrms audio output to the line. If the
microphone input is higher than 4 mVrms, adjust the pre-amp
Limiter to reduce clipping of the audio output signal, if neces­sary.

CONNECTOR PIN CONFIGURATIONS

Mono Headset Connector

Type: XLR-4M

Pin 1 Headset microphone low
Pin 2 Headset microphone high
Pin 3 Headphone high
Pin 4 Headphone low

Panel Microphone or Stereo Headset Connector

Type: NTRK-8F

Pin 1 Panel microphone low
Pin 2 Panel microphone high
Pin 3 12 VDC
Pin 4 Headset microphone high
Pin 5 Right headphone high
Pin 6 Right headphone low
Pin 7 Left headphone high
Pin 8 Left headphone low

13

Program Inputs

Type: DB9F

Pin 1 Ground
Pin 2 Program 1 input low
Pin 3 Program 2 input low
Pin 4 NC
Pin 5 NC
Pin 6 Program 1 input high
Pin 7 Program 2 input high
Pin 8 NC
Pin 9 NC

P.A. Output

Type: 1/8-inch Stereo Phone Jack

Unbalanced Wiring (-000 Model)

Tip: PA output high
Ring: Not used
Sleeve: Common

Balanced Wiring (-001 Model)

Tip: PA output high
Ring: PA output low
Sleeve: Common

Speaker Outputs

(Connect to a powered speaker or the auxiliary input of an amplifier)

Type: RCA Phone Jack

Tip: Speaker output high
Sleeve: Common

14

Intercom Channel Connectors

Type: One XLR-3M and XLR-3F pair for each channel

Audiocom® Mode (Internal switch SW1 set to BAL position)

Pin 1 Common
Pin 2 Intercom audio low and +24 VDC input
Pin 3 Intercom audio high and +24 VDC input

Clear-Com Mode (Internal switch SW1 set to UNBAL position)

Pin 1 Common
Pin 2 +24 VDC input
Pin 3 Intercom audio high

Expansion Out

Type: 2.0 mm stereo jack

Tip: Talk output
Ring: Listen input
Sleeve: Common

External Power

Type: 2.0 mm jack

Internal pin: positive (+)
External shell: negative (-)

15

SPECIFICATIONS

GENERAL

Power Requirements:

Channel supplied: 24 VDC nominal (12 to 30 VDC), 65 to 150 mA
External supply: 12 to 15 VDC, 65 to 150 mA

Environmental Requirements:

Storage: -20ºC to 80ºC; 0% to 95% humidity, non-condensing
Operating: -15ºC to 60ºC; 0% to 95% humidity, non-condensing

Dimensions:

1.75" (44.5 mm) H x 8.25" (209.5 mm) W x 5.25" (133.4 mm) D

Weight:

1.3 pounds (0.59 kg)

INTERFACE REQUIREMENTS:

Headset:

50 to 200W dynamic microphone
150 to 600W headphones

Panel Microphone:

5 kW Electret microphone (-57 dB)

Balanced Intercom Channel:

Output Level: 1 Vrms nominal
Input Impedance: 300W
Bridging Impedance: greater than 10,000W
Return Cancellation: -40 dB, 35 dB adjustable range
Call Signalling:

Send: 20 kHz ±100 Hz, 0.5 Vrms ±10%
Receive: 20 kHz ±800 Hz, 100 mVrms

Mic-Off Frequency:

Send: 24 kHz ±300 Hz, 0.5 Vrms ±10%

Detect: 24 kHz ±800 Hz, 100 mVrms
Noise Contribution: less than -70 dB
Common Mode Rejection Ratio: greater than 50 dB

16

Unbalanced Intercom Channel:

Output Level: 200 mVrms ±10%
Input Impedance: 150W
Bridging Impedance: greater than 10,000W
Return Cancellation: -40 dB, 35 dB adjustable range
Call Signalling:

Send: 11 ±3 VDC

Receive: 4 VDC minimum

PROGRAM INPUT

Voltage Gain Range:

25 ±3 dB

Output Level:

1.0 Vrms nominal, 2.3 Vrms maximum

Input Impedance:

Balanced: 75 kW
Unbalanced: 38 kW

Common Mode Rejection:

Greater than 50 dB

PA OUTPUT

Output Level:

235 mVrms nominal

HEADPHONE AMPLIFIER

Voltage Gain:

30 ±3 dB

Maximum Output:

250 mW ±10% into 150W, 65 mW±10% into 600W

Frequency Response:

200 Hz to 8 kHz +1/-3db

Audible Alert:

2 kHz, at the headset

17

Total Harmonic Distortion:

Less than 0.2% at 200 mW

Sidetone:

18 ±2 dB, adjustable

PANEL MICROPHONE AMPLIFIER:

Voltage Gain:

· Mic to CHN; 25±3 dB, before limiting

· Mic to Headphone; adjustable, 45 dB ±10% maximum, into 150W

· Mic to PA; 15 ±3 dB, 235 mVrms ±10%

Frequency Response:

200 Hz to 8 kHz +1/-3dB

Total Harmonic Distortion:

Less than 0.2% at CHN output

VOX Range:

-75 to -30 dB, -60 dB factory set

SPEAKER OUTPUT:

Output Level:

0 dB nominal (1.0 Vrms)

Output Impedance:

1000W nominal

Frequency Response:

200 Hz to 15 kHz +1/-3dB

18

FACTORY SERVICE

All equipment returned for repair must be accompanied by
documentation stating your return address, telephone number and proof
of date of purchase, along with a description of the problem. In lieu of
this, you may obtain a Return Authorization form from our Customer
Service Department.

Customer Service Department
Telex Communications, Inc.
9600 Aldrich Avenue South
Minneapolis, Minnesota 55420 U.S.A.
Telephone: [phone]
(Collect calls not accepted)

Return equipment to:

Service Department
Telex Communications, Inc.
West 1st Street
Blue Earth, Minnesota 56013 U.S.A.

Warranty Repairs - If in warranty, no charge will be made for the repairs.
Equipment being returned for warranty repair must be sent prepaid and
will be returned prepaid.

Non-Warranty Repairs - Equipment that is not under warranty must be
sent prepaid to Telex. If requested, an estimate of repair costs will be
issued prior to service. Once your approval for repair, and repair of
equipment is completed, the equipment will be returned on a collect
basis. Collect charges may be avoided by sending a signed check for
payment in full along with your signed estimate approval form (the
estimate includes the shipping charge).

19

US-2000/ES-4000 QUICK REFERENCE

Reset US-2000 Press

Reset ES-4000 Press

Test signal on Press

Test signal off Tap

Mic latched on Tap

Mic latched off Tap

Mic momentary on Hold

Mic momentary off Release

VOX mode on Tap twice:

VOX mode off Tap

All talk on Hold

All talk off Release

Public address HoldPAwhen

Mic kill Tap

Mic kill all channels Tap

Program kill on Hold

Program kill off Hold

Audible call alert on Hold

Audible call alert off Hold

Exit mic kill features Tap

Talk latched on Tap

Talk latched off Tap

Talk momentary on Hold

Talk momentary off Release

Call signal on Hold

Call signal off Release

Receive call signal (Call key blinks red)

Listen latched on Tap

Listen latched off Tap

Listen momentary on Hold

Listen momentary off Release

All Talk

and

All Talk

4 and

All Talk

andPA, then tap

Call

, then tap any other key

HeadsetorPanel Mic

HeadsetorPanel Mic

HeadsetorPanel Mic

HeadsetorPanel Mic

HeadsetorPanel Mic

HeadsetorPanel Mic

All Talk

green)

when

All Talk

HeadsetorPanel Mic

Mic Kill

green, and the Talk and Listen keys are green)

and all Talk and Listen keys are green)

, then tap

Mic Kill

, then tap

Mic Kill

, then tap channel

Mic Kill

, then tap channel

Mic Kill

, then tap either

Mic Kill

, then tap either

Mic Kill

Talk

(key is green)

Talk

Talk

Talk

Call

Call

Listen

(key is green)

Listen

Listen

Listen

Listen

1

Listen

5

Call

(key is green)

(key is orange)

HeadsetorPanel Mic

is lit (PAkey is green)

TalkorListen(Mic Kill

All Talk (Mic Kill

Talk(Talk

Talk

Call

(all

Call

Call

is lit (

All Talk

key is

key will blink

key will blink green,

key is green)

keys are red)

TELEX COMMUNICATIONS, INC. • 12000 Portland Ave. S., • Burnsville, MN 55337 U.S.A.

9300-7322-000 Rev. D September 1996