Telex Audiocom US2000A User Instructions

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Telex

User Instructions

Volume

Panel Mic

Headset

AllTalk

US2000A

Listen

Call

Listen

Talk

Call

Mic Kill

Talk

Model US2000A Intercom User Station

Audiocom

Intercom Systems

FCC Statement

This equipment uses and can radiate radio frequency energy that may cause interfer ence 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 comput ing device pursuant to Subpart J, Part 15 of FCC Rules which are designed to pro vide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area may cause interfer ence which the user (at his own expense) will be required to correct.

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

Introduction

Thank you for purchasing the Audiocom US2000A Intercom User Station. We hope the many design features of this product will satisfy your intercommunication requirements for many years to come. To get the most out of your new intercom station, please take a few moments to look through this booklet before using the US2000A for the first time.

Table of Contents

Description ...............4

Features ................5

Installation ...............6

Unpacking ..............6

Configuration Pre-check ...........6

Mounting Configurations ...........11

Connections..............12

Cables ...............13

Power-Up Check ............27

Test Tone ..............27

Sidetone Adjustment ............27

Voice-Activated Microphone (Vox) Setup .......29

Operation ...............31

Normal vs Programming Mode .........31

Volume Adjustment ............31

Receiving Calls .............31

Calling an Intercom Channel ..........32

Microphone Mute During Talk .........32

All Talk ..............32

Public Address (PA) ............33

Turning the Program Inputs On and Off .......33

Using Mic Kill .............33

Using Voice-Activated Microphone (Vox) .......34

Incoming Call Beep On/Off ..........34

Specifications ..............35

Factory Service and Parts Information .........38

Quick Reference..............39

Description

The US2000A Intercom User Station is designed for stationary use by personnel who

may require selective access to two or more intercom channels. It can be rack

mounted or used as a desktop station. For rack mounting, optional hardware is re

quired. For desktop use, four rubber feet are supplied.

The US2000A can be used as a simple, multi-channel user station. Typically, in this

application, no program sources or public address output are connected, and some

advanced features can be disabled: the station simply provides talk, listen and call

capability for a single user. Alternatively, the US2000A can function as a master sta

tion. In this configuration, most or all advanced features are activated. Also, program

inputs and a public address output may be connected. This configuration is ideal for

command and control personnel such as directors, supervisors, etc.

The basic US2000A can communicate with two intercom channels. This number can

be increased by connecting optional ES4000A Expansion Stations. Each ES4000A

adds four additional channels, and up to four of these expansion stations can be con-

nected for a total of eighteen channels.

US2000A

Volume

Vox

Panel Mic

Headset

Mic Kill

All Talk

Listen Listen

Call Call

Tal k Tal k

PGM 1

CHN 1

PUSH

VOL

PGM 2

VOL

CHN 2

PROGRAM

INPUTS

12-15 VDC

SPEAKERS

LINE LEVEL

1VRMS

EXP

P.A .

OUT

BAL - OUT UNBAL - IN

Figure 1. US2000A Reference View (See numbered features, page 5)

PUSH

Features

1. Dynamic-Mic Headset Connector: Accepts headsets with monaural headphones and ei ther a balanced or unbalanced dynamic microphone.

2. Panel Mic / Electret-mic Headset Connector: Accepts an electret gooseneck microphone, such as the Telex Model EGM-12N or EGM-18N, or a monaural, electret-mic headset.

3. Volume Control: Adjusts headphone volume only. If an external speaker is used, volume is adjusted at the speaker.

4. Vox Trimmers: Used with the voice-activated microphone feature. Separate trimmers adjust the voice activation level for the headset and panel microphones.

5. Headset and Panel Mic Keys: Used to manually activate either the headset or panel micro phone, whichever is being used.

6. All Talk Key: Used to talk to all stations that are listening on all channels. This includes both US2000A channels and all channels of any connected ES4000A Expansion Stations.

7. PA Key: If the US2000A is connected to a public address system, this key may be used to talk over the public address system.

8. Mic Kill Key: Used to turn off the microphones on any intercom stations on a channel. Also used to activate the program inputs and the audible beep feature for incoming calls.

9. Intercom Talk Keys: Momentary or latching (hands-free) operation possible.

10. Call Keys: Used to place calls on intercom channels and to indicate incoming calls.

11. Intercom Listen Keys: Momentary or latching operation possible.

12. Program Inputs Connector and Trimmers: Each intercom channel has its own program in put and level adjust trimmer. The program inputs may be turned on or off via the front panel, and they may be set to interrupt during talk if desired.

13. Local Power Jack: An optional PS-L local power supply can be connected to power the US2000A from an AC outlet instead of from the intercom channels.

14. PA Output: Connects to a public address system.

15. Expansion Out Connector: Connects to an ES4000A Expansion Station.

16. Speaker Output Jacks: A single powered loudspeaker or dual powered loudspeakers may be connected for monaural or binaural listening.

17. Intercom Channel Connectors and Audiocom / Clear-Com* Selector Switch: Two connec tors are provided for each channel for loop-through connection of multiple intercom sta tions. The selector switch sets the US2000A for compatibility with either Audiocom or Clear-Com channel connector pin-outs, channel power requirements, and call signaling re quirements.

* Brand names mentioned are the property of their respective companies.

Installation

Unpacking

The package contains the following items. Contact the shipper or your Audiocom dealer immediately if anything is damaged or missing. Detach and fill out the regis tration card and return it to Telex to properly register your US2000A.

Quantity Description

1 US2000A Intercom Station 1 Warranty and registration card 1 User Manual 4 Rubber feet for desktop use of the US2000A 1 Termination plug for special applications (Figure 13

, page 24)

Configuration Pre-check

Before connecting the US2000A make sure that it is properly configured for your intended usage. Figure 2

shows the locations of the configuration jumpers and switches. To access internal switches and jumpers, remove one screw from the top cover and three screws from each side. Note that switch SW2 can be accessed through the back panel.

If you change any switch settings while the US2000A is operating, you must

☞

perform a reset: either cycle power off then on, or simultaneously press the All Talk and Listen 1 keys, then release them. The sidetone controls are adjusted after power-up and are normally accessed through the bottom cover.

Channel 2 Sidetone

SW1

1 2 3

SW3

Channel 1 Sidetone

SW2

Figure 2. Locations of Configuration Jumpers and Switches

Table 1. Configuration Switch Settings

Switch

Description Settings Default

Number

DIP Switch SW1 (Internal)

SW1-1 Headset microphone type

SW1-2 Call signal send, channel 1

SW1-3 Call signal receive, channel 1

SW1-4 Call signal send, channel 2

SW1-5 Call signal receive, channel 2

SW1-6 Mic kill signal send

SW1-7 Program 2 interrupt

SW1-8 Program 1 Interrupt

Push-button Switch SW2 (BAL-UNBAL Switch on Back Panel)

Audiocom or Clear-Com

operation

DIP Switch SW3 (Internal)

On: Unbalanced Off: Balanced (Typical)

On: Enabled Off: Disabled

On: Interrupt during talk Off: No Interrupt

Out: Audiocom (Balanced) In: Clear-Com (Unbalanced)

Setting

Off

Out

SW3-1 Incoming call beep, headset

SW3-2* Listen 1 to speaker 1 only

SW3-3 Incoming call beep, speaker 1

SW3-4 Incoming call beep, speaker 2

SW3-5* Listen 2 to right headphone

SW3-6* Listen 2 to speaker 2

SW3-7* Listen 2 to speaker 1

SW3-8* Listen 1 to left headphone

* Set all to monaural or all to binaural. Do not mix settings.

On: Disabled Off: Enabled

On: Enabled (Binaural) Off: Disabled (Monaural)

On: Enabled (SW3-1 must be off) Off: Disabled

On: Enabled (Monaural) Off: Disabled (Binaural)

On: Enabled (Binaural) Off: Disabled (Monaural)

On: Enabled (Monaural) Off: Disabled (Binaural)

Off

Headset Microphone Type Selection DIP Switch

SW1-1 applies only to a dynamic-mic headset connected to the dynamic-mic headset jack on the front panel. If the headset specifications indicate the microphone type is balanced, or if you are unsure, leave this switch in the off (default) position. If the specifications indicate an unbalanced microphone set SW1-1 to on.

For best results in noisy environments, a noise canceling (directional or

☞

cardioid) microphone is highly recommended. This is especially true if you are using the vox feature.

Mic Kill Send Enable DIP Switch

The US2000A can generate an inaudible signal which will turn off the microphones on all intercom stations on a channel (for stations that detect this signal). This feature is useful, for example, when an unattended microphone has been left on and is causing unnecessary noise on a channel. By default, Mic Kill is not enabled. To activate this feature set SW1-6 to the on position.

Program Interrupt DIP Switches

If you plan on using external program sources with the US2000A, you have a choice of whether or not you want the program audio to shut off on the intercom channel while you are talking. By default, program audio does not interrupt during talk. You can change this as follows:

1. For channel 1 program interrupt during talk, set SW1-7 to on .

2. For channel 2 program interrupt during talk, set SW1-8 to on .

Incoming Call Beep DIP Switches

If call signal receive is enabled (switches SW1-3 and SW1-5), incoming calls will be indicated by red-flashing Call keys. An optional beep tone can also be used. Internal switches enable the beep tone. You can then turn the beep tone on or off via the front panel during normal operation. Enable the beep tone as follows:

1. Make sure the call signal receive DIP switches are on (SW1-3 and SW1-5).

2. For incoming call beep in a headset, set SW3-1 to off.

3. For incoming call beep in speaker 1, set SW3-1 to off and SW3-3 to on.

4. For incoming call beep in speaker 2, set SW3-1 to off and SW3-4 to on.

5. The procedure to turn incoming call beep on or off during operation can be found on page 34

Monaural or Binaural Operation DIP Switches

The US2000A can be used with a single speaker or monaural headphones (single- or double-sided) for monaural operation. In this case, all audio signals are combined and sent to the headphones and the Speaker 1 jack on the back panel. The US2000A can also be used with two speakers for binaural operation. In this case, channel 1 is sent to the Speaker 1 jack and channel 2 is sent to the Speaker 2 jack. Binaural headphone operation is not supported.

For monaural operation with headphones or one speaker (factory default):

1. Set SW3-2 to off.

2. Set SW3-5 to on.

3. Set SW3-6 to off.

4. Set SW3-7 to on.

5. Set SW3-8 to on.

For binaural operation with 2 speakers:

1. Set SW3-2 to on.

2. Set SW3-5 to off.

3. Set SW3-6 to on.

4. Set SW3-7 to off.

5. Set SW3-8 to off.

Balanced/Unbalanced Switch (SW2)

This switch is set at the factory to the balanced (BAL) position for use with Audio com intercom channels. Set the switch to the unbalanced (UNBAL) position for use with a Clear-Com intercom system.

Direct Program Listen Enable / Disable Jumpers

By default, each US2000A program input can be heard by all intercom stations that are listening on the corresponding intercom channel. This includes the US2000A. (Program input routing to the intercom channels can be turned on or off via the US2000A front panel programming. See "Turning the Program Inputs On and Off", page 33

.) Additionally, all program signals can be routed directly to the US2000A speaker or headset. This lets the US2000A operator hear the program inputs even if they are not being routed to the intercom channels. To disable direct program listening in the speaker or headset for one or more program inputs, reset the appropriate jumper as shown in Table 2

Table 2. Direct Program Listen Enable / Disable Jumpers

Jumper Description Settings for Jumpers J3 Program 1 direct to Headset or Speaker J6 Program 2 direct to Headset or Speaker

Pins 2&3 Shorted: Enable Pins 1&2 Shorted: Disable

Mounting Configurations

The US2000A can be used on a desktop, or it can be rack mounted. For desktop use, install the 4 rubber feet supplied with the US2000A. For rack mounting, use optional Audiocom RMK Rack Mount Kits (Figure 3).

You will have to perform the sidetone adjustment (page 27) after all compo

☞

nents are connected. However, when the US2000A is rack mounted, you may not be able to access the sidetone trimmers. In this case, you can position the US2000A in the rack and make all required connections. Then, adjust the sidetone trimmers before installing and tightening all rack mount screws.

RMK-S Single-Unit Rack Mount Kit

for one 1/2-rack wide Audiocom component*

RMK-D Dual-Unit Rack Mount Kit

for two 1/2-rack wide Audiocom components*

RMK-M Multi-Unit Rack Mount Kit

for mixed 1/2-rack and 1/4-rack wide Audiocom components*. Mounts one 1/2-rack wide unit with 1/4-rack wide components, or 3 1/4-rack wide components.

* 1/2-rack wide components: US2000A, ES4000A, PS2000L, SPS2000A,

PS4000, PS-X, SPK-2000.1/4-rack wide components: SPK-1000

Figure 3. Audiocom RMK Rack Mount Kits

Connections

Central Master Station vs Remote Station

The US2000A can be used in a variety of configurations as a speaker station or as a headset station. Additionally, it can be used as a central master station or as a remote station. When used as a central master station, the US2000A is placed in the same lo cation as the system power supplies, and if an SPS2000A power supply is used, the US2000A can take advantage of the SPS2000A built-in speaker for speaker output. When used as a remote station, the US2000A is not at the same location as the power supplies, and if it is being used as a speaker station, a separate speaker must be sup plied. Figures 4 the US2000A when used as a central or remote headset or speaker station.

All Locally Powered Stations

Any US2000A can be locally powered by connecting a PS-L Local Power Supply. This is shown as an option in Figures 4 system where all stations are powered from local power supplies, with no central power supply. This is illustrated in Figure

External Program Input and PA Output

Connections for external program input and PA output are shown in Figure 14

ES4000A Expansion Station Connection (Optional Component)

through 12, starting on page 15, illustrate several configurations for

through 12. A special case is an intercom

13, page 24.

, page 25.

Refer to the ES4000A User Instruction Manual for detailed connection information.

Cables

The numbers below correspond to the cable numbers in the connection drawings on the following pages.

1. 1-channel intercom cable. Sold separately. Use Telex "ME" cables, below. Or, build per Figure 15, page 26.

ME-25: 25' (7.6 m) cable with Male and Female 3-pin XLR connectors.

ME-50: 50' (15.2 m) cable with Male and Female 3-pin XLR connectors.

ME-100: 100' (30.4 m) cable with Male and Female 3-pin XLR connectors.

* When connecting from a power supply to a TW-7W, keep cables as short as pos

sible. Also, heavier gage wire is recommended.

2. 2-channel intercom cable. Sold separately. Use Telex "ME /2" cables, below. Or, build per Figure 15, page 26.

ME-25/2: 25' (7.6 m) cable with Male and Female 6-pin XLR connectors.

ME-50/2: 50' (15.2 m) cable with Male and Female 6-pin XLR connectors.

ME-100/2: 100' (30.4 m) cable with Male and Female 6-pin XLR connectors.

3. Y adapter cable. Sold separately. Use Telex CA-23-16. Or, build per Figure 15, page 26.

4. 3 ft (0.91 m) speaker cable with RCA plugs. One supplied with each SPS2000A, SPK-1000, and SPK-2000.

5. 18" (457 mm) EXP IN/OUT cable, stereo miniplug to stereo miniplug. One sup plied with each ES4000A.

6. 18" (457 mm) CHANNEL OUTPUT cable, 15-pin Male Dsub to 15-pin Male Dsub. One supplied with each ES4000A. (Optional component. See ES4000A

User Manual for connection information.)

7. Shielded patch cable, 9-pin Male Dsub to 9-pin Female Dsub. Customer local

purchase: available at Radio Shack, etc. Note: All pins must be connected straight through: do not use an RS232 computer cable!

8. Shielded patch cable, stereo miniplug to stereo miniplug. Customer local pur

chase. Available at Radio Shack, etc.

9. Shielded audio cable. Must have male 3-pin XLR connector at one end for con

nection to the XP-USPG or XP-4PGM program inputs. Pin-out for program in puts is as follows:

Pin 1: common

Pin 2: + program input

Pin 3: - program input

10. Shielded audio cable. Must have male 3-pin XLR connector at one end for con-

nection to the XP-USPG PA output. Pin-out for PA output is as follows:

Pin 1: common

Pin 2: + PA output

Pin 3: - PA output

11. 18" (457 mm) CHANNEL OUTPUT cable, 15-pin Male Dsub to 15-pin Female

Dsub. One supplied with each XP-ES4000. (Optional component. See ES4000A User Manual for connection information.)

EGM MIC

FRONTVIEW

TYPICAL RACK-MOUNT SETUP

US2000A

BACKVIEW FOR DAISY-CHAIN CONNECTION

PS-L (OPTIONAL)

BACKVIEW FOR HOME-RUN CONNECTION

PS-L (OPTIONAL )

1* 11* 1

CH 1

TW-7W TW-7W

SPS2000A

CH 1 CH 2

TO ADDITIONAL

INTERCOM STATIONS

CH 2

RMK-D RACK MOUNT

111

Note: For further infor

mation about the cable numbers, see page 13.

* KEEP CABLES FROM

POWER SUPPLY TO TW-7W AS SHORT AS POSSIBLE.

1111 1 111111

Note: A BOP-1000 may

CH 1

TO ADDITIONAL INTERCOM STA TIONS

CH 2

be used to rack mount 2 TW-7W splitters.

Figure 4. US2000A Monaural Master Speaker Station Configuration with 1 Power Supply. This is a good configuration for smaller intercom systems when you

want to operate the US2000A as a master speaker station, with one speaker to monitor both intercom channels. In this configuration, the SPS2000A Combine/Isolate switch is set to the Isolate position. With this setting the 2 intercom channels are completely separated. The amplified speaker in the SPS2000A is used as the speaker output for the US2000A, and the US2000A dip switches are set to monaural operation so that both intercom channels are heard in the speaker. The PS-L local power supply is optional. When a PS-L is connected, the US2000A automatically disconnects from system power (supplied by the SPS2000A). When the US2000A is not drawing power from the intercom system, more system power is available for additional belt packs, etc.

EGM MIC

FRONTVIEW

TYPICAL RACK-MOUNT SETUP

SPK-2000 SPS2000A

US2000A

BACKVIEW FOR DAISY-CHAIN CONNECTION

PS-L

(OPTIONAL )

BACKVIEW FOR HOME-RUN CONNECTION

PS-L

(OPTIONAL )

TW-7W

TO ADDITIONAL

INTERCOM STATIONS

CH 2CH 1

PS-L

TW-7W

RMK-D RACK MOUNT

RMK-S RACK MOUNT

Note: For further infor

mation about the cable numbers, see page 13.

* KEEP CABLES FROM

POWER SUPPLY TO

TW-7W AS SHORT AS POSSIBLE.

1 11111 1 11111

Note: A BOP-1000 may

CH 1

TO ADDITIONAL INTERCOM STATIONS

CH 2

be used to rack mount 2 TW-7W splitters.

Figure 5. US2000A Binaural Master Speaker Station Configuration with 1 Power Supply. This is a good configuration for smaller intercom systems when you

want to operate the US2000A as a master speaker station, with a separate speaker for each intercom channel. Make sure the US2000A internal DIP switches are set for binaural speaker operation as described on page 9

. Also, set the SPS2000A Combine/Isolate switch to the Isolate position. With this setting the 2 intercom channels are completely separated. The amplified speaker in the SPS2000A is used as the speaker output for channel 1, and the SPK-2000 is used for channel 2. The PS-L local power supply is optional. When a PS-L is connected, the US2000A automatically disconnects from system power that is supplied by the SPS2000A. Since the US2000A is not drawing power from the intercom system, more system power is available for additional belt packs, etc.

FRONTVIEW

US2000A PS2000L

BACKVIEW FOR DAISY-CHAIN CONNECTION

111

Note: For further infor mation about the cable numbers, see page 13.

* KEEP CABLES FROM

POWER SUPPLY TO TW-7W AS SHORT AS POSSIBLE.

Note: A BOP-1000 may be used to rack mount 2 TW-7W splitters.

PS-L (OPTIONAL)

BACKVIEW FOR HOME-RUN CONNECTION

1 11 1

TW-7W (CH1) TW-7W (CH2)

1111 1 111111

CH 1 CH 2

TO ADDITIONAL INTERCOM ST ATIONS

PS-L

(OPTIONA L)

CH 1 CH 2

TO ADDITIONAL

INTERCOM STA TIONS

Figure 6. US2000A Master Headset Station Configuration with 1 Power Supply. This is a good configuration for smaller intercom systems when you want

to operate the US2000A as a master headset station. In this configuration, the PS2000L Combine/Isolate switch is set to the Isolate position. With this setting the 2 intercom channels are completely separated. Typically, a headset is connected to the front panel of the US2000A, and the US2000A DIP switches are set to monaural operation (default setting) so that both intercom channels are heard in the monaural headphones (binaural headphone operation is not supported). The PS-L local power supply is optional. When a PS-L is connected, the US2000A automatically disconnects from system power that is supplied by the PS2000L. Since the US2000A is not drawing power from the intercom system, more system power is available for additional belt packs, etc.

EGM MIC

PS2000L

(CH 2 POWER)

BACKVIEW FOR DAISY-CHAIN CONNECTION

TYPICAL RACK-MOUNT SETUP

FRONTVIEW

SPS2000A

(CH 1 POWER)

US2000A

RMK-D RACK MOUNT

RMK-S RACK MOUNT

PS-L

(OPTIONAL)

TO ADDITIONAL INTERCOM ST ATIONS

BACKVIEW FOR HOME-RUN CONNECTION

PS-L

(OPTIONAL)

TW-7W

1 11111 1 11111

1/2 CH 1

TO ADDITIONAL INTERCOM ST ATIONS

TW-7W

1 1111 1 1111

1/2 CH 1 TO ADDITIONAL INTERCOM ST ATIONS

1/2

CH 1

1* 1

1/2

CH 1

111

1/2

CH 2

1 1

TW-7W

1/2 CH 2

1/2

CH 2

1*1

TW-7W

1 1

Note: For further infor mation about the cable numbers, see page 13.

* KEEP CABLES FROM

POWER SUPPLY TO TW-7W AS SHORT AS POSSIBLE.

Note: A BOP-1000 may be used to rack mount 2 TW-7W splitters.

Figure 7. US2000A Monaural Master Speaker Station Configuration with 2 Power Supplies. This is a good configuration for large intercom systems when you

want to operate the US2000A as a master speaker station, with one speaker to monitor both intercom channels. In this configuration, the SPS2000A and PS2000L Combine/Isolate switches are set to the Combine position. With this setting all intercom stations connected to the SPS2000A are combined on intercom channel 1 and all intercom stations connected to the PS2000L are combined on channel 2. The amplified speaker in the SPS2000A is used as the speaker output for the US2000A, and the US2000A dip switches are set to monaural operation (default setting) so that both intercom channels are heard in the speaker. The PS-L local power supply is optional. When a PS-L is connected, the US2000A automatically disconnects from system power. Since the US2000A is not drawing power from the intercom system, more system power is available for additional belt packs, etc.

US2000A

FRONTVIEW

SPS2000A

(CH 1 POWER)

EGM MIC

SPS2000A

(CH 2 POWER)

BACKVIEW FOR DAISY-CHAIN CONNECTION

TYPICAL RACK-MOUNT SETUP

RMK-D RACK MOUNT

RMK-S RACK MOUNT

PS-L

(OPTIONAL)

1/2

CH 1

TO ADDITIONAL INTERCOM ST ATIONS

BACKVIEW FOR HOME-RUN CONNECTION

PS-L

(OPTIONAL)

TW-7W

1 11111 1 11111

1/2 CH 1

1 11111 1 1111

TW-7W

1/2

CH 1

111

1/2

CH 2

TW-7W

1/2 CH 2

1 1*

TW-7W

1/2

CH 2

1 1

Note: For further infor mation about the cable numbers, see page 13.

1*1

* KEEP CABLES FROM

POWER SUPPLY TO

TW-7W AS SHORT

AS POSSIBLE.

Note: A BOP-1000 may

1/2 CH 1 TO ADDITIONAL INTERCOM ST ATIONS

1/2 CH 2

be used to rack mount 2 TW-7W splitters.

Figure 8. US2000A Binaural Speaker Station Configuration with 2 Power Supplies. This is a good configuration for large

intercom systems when you want to operate the US2000A as a master speaker station, with a separate speaker for each intercom channel. In this configuration, the SPS2000A Combine/Isolate switches are set to the Combine position. With this setting all intercom stations connected to the one SPS2000A are combined on intercom channel 1 and all intercom stations connected to the other SPS2000A are combined on channel 2. The amplified speaker in each SPS2000A monitors a single intercom channel, and the US2000A dip switches are set to binaural operation (see page 9

). The PS-L local power supply is optional. When a PS-L is connected, the US2000A automatically disconnects from system power. Since the US2000A is not drawing power from the intercom system, more system power is available for additional belt packs, etc.

TYPICAL RACK-MOUNT SETUP

PS2000L

(CH 2 POWER)

BACKVIEW FOR DAISY-CHAIN CONNECTION

FRONTVIEW

PS2000L

(CH 1 POWER)

US2000A

RMK-D RACK MOUNT

RMK-S RACK MOUNT

PS-L

(OPTIONAL)

BACKVIEW FOR HOME-RUN CONNECTION

PS-L

(OPTIONAL)

TW-7W

1 11111 1 11111

1/2 CH 1

TW-7W

1 11111 1 1111

1/2

CH 1

TO ADDITIONAL INTERCOM STATIONS

1/2

CH 1

111

1/2

CH 2

TW-7W

1/2 CH 2

1/2

CH 2

1 1*

TW-7W

1 1

Note: For further infor mation about the cable numbers, see page 13.

* KEEP CABLES FROM

POWER SUPPLY TO TW-7W AS SHORT AS POSSIBLE.

Note: A BOP-1000 may

1/2 CH 1 TO ADDITIONAL INTERCOM STATIONS

1/2 CH 2

be used to rack mount 2 TW-7W splitters.

Figure 9. US2000A Headset Station Configuration with 2 Power Supplies. In this configuration, the PS2000L Combine/Isolate

switches are set to the Combine position. With this setting all intercom stations connected to the one PS2000L are combined on intercom channel 1 and all intercom stations connected to the other PS2000L are combined on channel 2. Typically, a headset is connected to the front panel of the US2000A, and the US2000A dip switches are set to monaural operation (default setting) so that both intercom channels are heard in the monaural headphones (binaural headphone operation is not supported). The PS-L local power supply is optional. When a PS-L is connected, the US2000A automatically disconnects from system power. Since the US2000A is not drawing power from the intercom system, more system power is available for additional belt packs, etc.

FROM PREVIOUS

INTERCOM STATION

FRONTVIEW

US2000A

BACKVIEW FOR DAISY-CHAIN CONNECTION

1 1

CH 2

CH 1

Note: For further infor mation about the cable numbers, see page 13.

FROMTW-7WSPLITTERS

LOCATED NEAR SYSTEM

POWER SUPPLY

PS-L

(OPTIONAL)

BACKVIEW FOR HOME-RUN CONNECTION

1 1

PS-L

(OPTIONAL)

NO CONNECTION

CH 2

1 1

CH 1

TO ADDITIONAL

INTERCOM STATIONS

Figure 10. Typical Remote Headset Station. In this example, the US2000A is not located near the system power supplies (SPS2000A, PS2000L etc.). The PS-L local power supply is optional and can be used to power a single intercom station. When a PS-L is connected to the US2000A, the US2000A automatically disconnects from system power. This makes more system power available for belt packs and other intercom stations. Also, when the US2000A is powered by a PS-L, it can be operated over a greater distance as a remote station.

EGM MIC

US2000A

BACKVIEW FOR DAISY-CHAIN CONNECTION

FROM PREVIOUS

INTERCOM STATION

PS-L

BACKVIEW FOR HOME-RUN CONNECTION

FRONTVIEW

1 1

PS-L

(OPTIONAL)

SPK-2000

CH 1

Note: For further infor mation about the cable numbers, see page 13.

CH 2

1 1

CH 1

TO ADDITIONAL

INTERCOM STATIONS

FROMTW-7WSPLITTERS

LOCATED NEAR SYSTEM

POWER SUPPLY

PS-L

1 1

PS-L

(OPTIONAL)

NO CONNECTION

Figure 11. Typical Remote Monaural Speaker Station. This example is similar to the one on the previous page, except an EGM microphone and an SPK-2000 speaker are used instead of a headset. Make sure the internal DIP switches are set for monaural speaker operation (default setting) as described on page 9

.A PS-L local power supply is required for the SPK-2000, but is optional for the US2000A. When a PS-L is connected to the US2000A, the US2000A automatically disconnects from system power. This makes more system power available for belt packs and other intercom stations. Also, when the US2000A is powered by a PS-L, it can be operated over a greater distance as a remote station.

EGM MIC

TYPICAL RACK-MOUNT SETUP

FRONTVIEW

FROM PREVIOUS

INTERCOM STATION

PS-L

(OPTIONAL)

BACKVIEW FOR HOME-RUN CONNECTION

FROMTW-7WSPLITTERS

LOCATED NEAR SYSTEM

POWER SUPPLY

SPK-2000

US2000A

BACKVIEW FOR DAISY-CHAIN CONNECTION

1 1

PS-L

1 1

CH 1

PS-L

CH 1

SPK-2000

CH 2

1 1

CH 1

CH 2

RMK-D RACK MOUNT

RMK-S RACK MOUNT

TO ADDITIONAL

INTERCOM STATIONS

PS-L

Note: For further infor mation about the cable numbers, see page 13.

PS-L

(OPTIONAL)

NO CONNECTION

Figure 12. Typical Remote Binaural Speaker Station. This example is similar to the one on the previous page, except that each channel is heard in a separate speaker. Make sure the internal DIP switches are set for binaural speaker operation as described on page 9

. As in the previous example, a PS-L local power supply is

required for each SPK-2000 speaker, but is optional for the US2000A.

Note: For further information about the cable numbers, see page 13.

TERMINATION

PLUGS

SPK2000

PS-L PS-L

SPK2000

PS-L PS-L

SPK2000

PS-L PS-L

US2000A

1 1

CH 1 CH 2

1 1

TO ADDITIONAL

LOCALLY POWERED

INTERCOM STATIONS

Figure 13. An example of all locally powered US2000A intercom stations. In this example, all components are locally powered using PS-L local power supplies. Note the use of one termination plug in each intercom channel. (One termination plug is supplied with each US2000A.) Only one termination plug should be installed per channel. Typically, they are installed at the first intercom station in the chain. If 2 terminations are installed in a channel, the sound quality and volume level will be noticeably reduced. IMPORTANT!: If a system power supply (SPS2000A, PS2000L etc.) is ever connected anywhere in a channel, the termination plug should be removed from that channel, because the system power supply already has built-in termination.

The advantage of locally powered stations is that they can be operated over a greater distance than is possible when using a system power supply.

PGM

2IN

PGM

1IN

OUT

9 109

CH 1-2

XP-USPG

Note: For further infor

mation about the cable numbers, see page 13

FRONT

US2000A

BACK

Figure 14. External Audio Input and PA Output. You can connect two audio sources to the Program Inputs connector: one for each channel. Audio sources can be directly connected with a user-supplied DB9M connector. (Refer to the program input connector specifications, located on page 35 a more convenient method is to use an XP-USPG Breakout Panel as shown. The XP-USPG lets you use standard, 3-pin XLR audio cables to connect audio sources. The XP-USPG also interfaces the PA jack of the US2000A to a standard, 3-pin XLR audio cable. Note: The XP-USPG Breakout Panel can be rack mounted using a BOP-1000 Rack Mount Plate.

, for connector pin-out.) However,

TYPICAL 1-CHANNEL CABLE WIRING

33 22

Shield Shield

CableType: 22AWG Stranded, 2-PairTwisted-wire, with Shield Connector Type: 3-Pin XLR Audio (Neutrik or Switchcraft)

Pin 1: Common

Channel Audio / Power

Pin 2: Pin 3: Channel Audio / Power

: Earth ground

Shield

44 33

66 55

Shield Shield

CableType: 22AWG Stranded, 3-PairTwisted-wire, with Shield Connector Type: 6-Pin XLR Audio (Neutrik only, not compatible with 6-pin Switchcraft)

Pin 1: Channel 1 & 2 Common Pin 2: No connection Pin 3: Channel 1 Audio / Power Pin 4: Channel 1 Audio / Power Pin 5: Channel 2 Audio / Power Pin 6: Channel 2 Audio / Power Shield

: Earth ground

3 2

Ch1

Case

3 2

Ch2

Shield

Pair 1

Pair 2

1(Bothwires)

Denotes twisted pair. Denotes shield.

TYPICAL 2-CHANNEL CABLE WIRING

Pair 1

Pair 2

Pair 3

Denotes twisted pair. Denotes shield.

“Y” CABLEWIRING

Pair 1

Pair 2

Pair 3

1(Bothwires)

4 3

6 5

1(Bothwires) Shield

Use second drain wire if available, or add an extra section of wire.

* Standard cables are generally constructed using a male connector at one end and a

female connector at the other end.This allows several cables to be interconnected to create longer cable runs. also typically provide both a male and female Neutrik connector for each intercom channel.This permits loop-through connection of several intercom stations using the standard cables. channel. Audiocom wallplates use male Neutrik connectors.

Audiocom master stations, speaker stations and belt packs

Audiocom power supplies use a 3-pin male Neutrik connector for each

Figure 15. Audiocom Intercom Cables

Power-Up Check

Plug in any PS-L local power supplies that are being used, and also turn on any sys tem power supplies that are being used. When power is first applied to the US2000A, it will perform a power-up reset, in which the front panel indicators will cycle through all of their possible colors and then turn off. This verifies the general opera tion of the intercom station and indicators. The US2000A also reads the settings of all DIP switches at this time and configures itself accordingly.

Test Tone

The US2000A can generate a test tone, which can be used to verify intercom channel operation after installation or to locate a malfunction. This test tone is also used for the sidetone adjustment which follows. Use the test tone as follows:

1. Simultaneously press the All Talk and PA keys to activate the test tone.

2. Tap the Call key for the channel that you want to test (can be either a US2000A channel or an ES4000A channel).

3. Verify that the test tone can be heard at all intercom stations on the channel. Replace any defective cable or intercom station where the test tone is being lost.

4. Tap the same Call key to stop the test signal on that channel.

5. Press any key except a Call key to turn off the test tone.

Sidetone Adjustment

The US2000A uses full-duplex audio (the same as a conventional telephone line) in which the talk and listen audio are sent and received on the same line. Thus, when you talk on a channel, you will also here your own voice back in the speaker or head phones. This is called sidetone. If you are using the US2000A with a microphone and speaker, sidetone could cause unwanted feedback, since the microphone may pick up your returned voice audio and re-amplify it. This could also happen if you are using a headset where the ear cushions do not completely cover the ears, al though it is probably much less likely. In either of these cases, you should minimize

the amount of sidetone. On the other hand, if you are using headphones that com pletely enclose the ears, a certain amount of your own voice level is desirable to overcome the muffled sensation when talking.

If you are using a speaker and microphone, or open-ear style headphones, ad just sidetone as follows:

1. Simultaneously press the All Talk and PA keys to activate the test tone.

2. Tap the channel 1 Call key to send the test tone on channel 1.

3. Increase the volume until you can hear the test tone. (If you are using a headset,

adjust the volume control at the US2000A. If you are using a speaker, adjust the volume control at the speaker).

4. Using a small flat-bladed screwdriver, adjust the channel 1 sidetone through the

access hole in the bottom of the US2000A (Figure 16 ume.

5. Tap the channel 1 Call key to turn off the test tone on channel 1 when finished.

6. Tap the channel 2 Call key, and repeat the adjustment for the channel 2 sidetone.

7. Tap any other key, except a Call key, to turn off the test tone when finished.

If you are using headphones that completely enclose the ears, adjust sidetone as follows:

) to minimize the tone vol-

1. Tap the Headset key to turn the headset microphone on.

2. Tap the channel 1 Talk key to turn it on.

3. While speaking into the microphone, use a small flat-bladed screwdriver to ad

just the channel 1 sidetone so that you hear your voice at an acceptable level in the headphones. Tap the channel 1 Talk key to turn it off when finished.

4. Tap the channel 2 Talk key to turn it on, and adjust the channel 2 sidetone as for

channel 1. Tap the channel 2 Talk key to turn it off when finished.

Channel 1 Sidetone

Channel 2 Sidetone

Figure 16. US2000A Bottom View

Voice-Activated Microphone (Vox) Setup

If you are going to use vox, you must adjust the vox level for proper operation. If the vox level is too low, room noise will activate the microphone. If the vox level is too high, the microphone will not activate when you begin talking. Check and set the level as follows:

1. If you are using a headset, tap the Headset key twice to turn on headset vox. Or, if you are using a panel microphone, tap the Panel Mic key twice to turn on panel mic vox. Whichever key you tap, it will glow orange when the micro

phone is off and will flicker or turn green when sound is picked up by the micro phone.

2. Position the microphone at its normal operating location. If you are using a head set, put the headset on and position the microphone close to your mouth. Insure that background noise is at the normal operating level.

3. Do not speak into the microphone.

4. Check the Headset or Panel Mic key, whichever you are using. If the key is con stantly glowing orange, turn the vox trimmer clockwise until the key begins to flicker green (mic activating) then turn the trimmer slightly back in the counterclockwise direction until the Panel Mic key just returns to steady orange

(mic off). If you are wearing a headset, make sure that breathing and movement do not cause the Panel Mic key to flicker green. If they do, adjust the vox con trol slightly more in the counterclockwise direction to eliminate this.

5. Speak into the microphone in a normal voice, and check that the headset key im

mediately turns green when you talk. If it does not, move the microphone closer to your mouth. If you are still unable to get satisfactory results, it may be that the microphone does not have the directional characteristics required for the noise level in the room. A directional, or cardioid, microphone is recommended when using Vox. Omnidirectional microphones may not produce good results.

Operation

A quick-reference to the following operating features can be found on the inside

☞

of the back cover.

Normal vs Programming Mode

The US2000A has two operating modes: normal operating mode and programming mode. In normal operating mode, the Mic Kill key will be unlit, and in programming mode it will be lit continuously. To return the US2000A to normal operation if it has been left in programming mode, tap the Mic Kill key.

Volume Adjustment

If you are using a headset, adjust the intercom listen level with the Volume control on the front panel of the US2000A. If you are using a speaker, adjust the intercom listen level with the Volume control on the speaker.

Receiving Calls

1. When there is an incoming call signal on a channel, the Call key for that channel will flash red. There will also be a beep tone if the beep feature has been activated (page 8

2. Activate the microphone: If you are using a dynamic-mic headset tap the Head set key to turn the mic on; if you are using a panel-mounted microphone or an electret-mic headset, tap the Panel Mic key to turn the mic on.

You can also use the voice-activated microphone (Vox) feature. See page 34.

☞

3. Turn on the Talk and Listen keys for the calling channel and begin your conver sation. Turn the keys off when finished.

When you tap the Headset key, or the Panel Mic key, or any Talk or Listen key,

☞

it will lock in the on position. You may then tap the key again to turn it off. For

momentary activation, press and hold the key. It will remain on as long as you hold it and it will turn off when you release it.

Calling an Intercom Channel

1. Press and hold the Call key for the channel that you want to call. An inaudible

call signal will be sent, and your listen key for that channel will automatically turn on in preparation to receive a verbal response.

2. When you hear a response, release the Call key.

3. If you are using manual microphone activation, make sure your microphone is

on: for a dynamic mic headset, tap the Headset key to turn it on; for a panelmounted microphone or electret headset, tap the Panel Mic key to turn it on.

4. Turn on the Talk key for the channel you called to begin you conversation.

5. Turn off your Talk and Listen keys to end the conversation.

Microphone Mute During Talk

You can mute the microphone while talking. Simply tap either the Headset key or the Panel Mic key, whichever is currently being used. Tap the key again to turn the microphone back on. (If you are using Vox, tap the key twice to reactivate vox.)

All Talk

You can talk to all intercom stations that currently have their listens activated. This applies to both channels of the US2000A as well as all talk channels of any con nected ES4000A Expansion Stations. Use All Talk as follows:

1. If you are using manual microphone activation, make sure the proper micro

phone switch is turned on (either Headset or Panel Mic).

2. Press and hold the All Talk key while talking. Release it when finished.

To insure that the All Talk key is never accidentally left in the on position, it

☞

does not latch.

Public Address (PA)

If the PA output on the back panel of the US2000A is connected to a public address system, you can talk on the public address system as follows:

1. If you are using manual microphone activation, make sure the proper micro phone switch is turned on (either Headset or Panel Mic).

2. Press and hold the PA key while talking. Release it when finished.

To insure that the PA key is never accidentally left in the on position, it does not have latching operation.

Turning the Program Inputs On and Off

1. Insure that program inputs have been connected at the back panel and that the program sources are on.

2. Press and hold the Mic Kill key for about 2 seconds, then release it. It should now be glowing green to indicate that the US2000A is in programming mode.

3. The current status of the program inputs is indicated by the Talk keys. If the channel 1 Talk key is lit, the program 1 input is currently activated to channel 1; if channel 2 talk is lit, program 2 is activated to channel 2. Tap either Talk key to turn the program input for that channel on or off.

4. When the program inputs are configured as desired, tap the Mic Kill key to exit

programming mode and return to normal operation.

5. Adjust program 1 and 2 levels via the trimmers on the back panel of the US2000A.

Using Mic Kill

If the Mic Kill feature has been enabled (page 8 on a single channel or on all channels. This feature is useful when a remote talk key has been left on and is causing unwanted noise on a channel. Use Mic Kill as follows:

1. Tap the Mic Kill key. It will blink green.

) you can use it to deactivate all talk keys

2. Tap the Talk or Listen key for a channel to turn off all talk keys on that channel.

Or, tap the All Talk key to turn off all talk keys. The key you tap will turn green and the Mic Kill signal will be sent.

3. Tap Mic Kill to exit.

Using Voice-Activated Microphone (Vox)

If you use Vox you will not have to insure that the microphone key is turned on whenever you want to talk. Activate Vox as follows:

1. Make sure the Headset and Panel Mic keys are off.

2. If you are using a headset, tap the Headset key twice to turn on headset vox. Or,

if you are using a panel microphone, tap the Panel Mic key twice to turn on panel mic vox. Whichever key you tap, it will glow orange when the microphone is off and will flicker or turn green when the microphone turns on.

The Vox level may require adjustment, see “Voice-Activated Microphone

☞

(Vox) Setup”, page 29.

Incoming Call Beep On/Off

Normally, incoming calls are indicated by red-flashing Call keys. An optional beep tone can also be enabled as follows:

1. Ensure that this feature has been activated via internal switches (page 8

2. Press and hold the Mic Kill key for about 2 seconds, then release it. It should now

be glowing green to indicate that the intercom station is in programming mode.

3. Tap either Call key on the US2000A to turn the beep feature on or off. (It does

n't matter which one you tap, since this feature affects both channels.)

4. Tap the Mic Kill key to return to normal operation.

Specifications

General

Power Requirements:

Phantom Power: 24 VDC nominal (12 to 30 VDC), 65 to 150 mA

Local Power: 12 to 15 VDC, 65 to 150 mA Dimensions: 1.75" (44.5 mm) high x 8.25" (209.5 mm) wide x 10.31" (261.9 mm) deep Weight: approximately 2lb (0.9 kg) Environmental Requirements:

Storage: -20°C to 80°C; 0% to 95% humidity, non-condensing

Operating: -15°C to 60°C; 0% to 95% humidity, non-condensing

Dynamic-mic Headset

Microphone: 50 to 200 ohm, dynamic (balanced or unbalanced) Headphones: 150 to 600 ohm, monaural Connector Type: XLR-4M

Pin 1 Microphone low

Pin 2 Microphone high

Pin 3 Headphone high

Pin 4 Headphone low

Panel Microphone or Electret-mic Headset

Microphone: 5 kohm, electret (-57 dB) Headphones: 150 to 600 ohm, monaural Connector Type: NTRK-8F

Pin 1 Microphone low

Pin 2 Panel microphone high

Pin 3 +12 VDC microphone bias

Pin 4 Headset microphone high

Pin 5 Headphone high

Pin 6 Headphone low

Pin 7 No connection

Pin 8 No connection

Program Input

Input Level: 100mV maximum Voltage Gain: 25 ±3 dB Output Level :1.0 Vrms nominal, 2.3 Vrms maximum Input Impedance: 75 kohm Common Mode Rejection: Greater than 50 dB Connector 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

Intercom Channels, Balanced Mode (SW2 set to BAL position)

Output Level: 1 Vrms nominal Input Impedance: 300 ohms Bridging Impedance: greater than 10,000 ohms Sidetone: -40 dB, 35 dB adjustable range Call Signaling:

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

Mic-Kill 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 Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel

Pin 1 Common

Pin 2 Intercom audio low and +24 VDC input

Pin 3 Intercom audio high and +24 VDC input

Intercom Channel, Unbalanced Mode (SW2 set to UNBAL position)

Output Level: 1 Vrms ±10% Input Impedance: 150 ohms Bridging Impedance: greater than 10,000 ohms Call Signaling:

Send: 11 ±3 VDC

Receive: 4 VDC minimum Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel

Pin 1 Common

Pin 2 +24 VDC input

Pin 3 Intercom audio high

PA Output

Output Level: 235 mVrms nominal Connector Type: 1/8-inch Stereo Phone Jack

Tip: PA output high

Ring: Not used

Sleeve: Common

Speaker Output

Output Level: 0 dB nominal (1.0 Vrms) Output Impedance: 1000 ohms nominal Frequency Response: 200 Hz to 8 kHz +1/-3dB Connector Type: RCA Phono Jack

Tip: Speaker output high

Sleeve: Common

Expansion Input /Output

Type: 2.0 mm stereo phone jack

Tip: Talk output

Ring: Listen input

Sleeve: Common

External Power

Type: 2.0 mm power jack

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

Headphone Amplifier

Voltage Gain: 30 ±3 dB Maximum Output: 250 mW ±10% into 150 ohms, 65 mW±10% into 600 ohms Frequency Response: 200 Hz to 8 kHz +1/-3db Incoming Call Beep Tone: 2 kHz, at the headphones Total Harmonic Distortion: Less than 0.2% at 200 mW Sidetone: 18 ±2 dB, adjustable

Panel Microphone Amplifier

Voltage Gains:

Mic to CHN; 25±3 dB, before limiting Mic to Headphone; adjustable, 45 dB ±10% maximum, into 150 ohms

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

Factory Service and Parts Information

When returning equipment for repair include your return address, telephone number and proof of date of purchase, along with a description of the problem.*

The address for Audiocom equipment returns and parts information is:

Service Department Telex Communications, Inc. West 1st Street Blue Earth, Minnesota 56013 U.S.A. Telephone: (507) 526-3205 (Collect calls not accepted)

Warranty Repairs - If in warranty, no charge will be made for the repairs. Equipment 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. After your approval and completion of the repairs, 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 (shipping charges are included in the estimate).

* For sales / technical support and system design contact:

Pro Audio Sales Department Telex Communications, Inc. 9600 Aldrich Avenue South Minneapolis, Minnesota 55420 U.S.A. Telephone: (612) 884-4051 (Collect calls not accepted)

Quick Reference

Reset US2000A Press All Talk and Listen 1 Reset ES4000A Press All Talk 4 and Listen 5 Test signal on Press All Talk and PA, then tap Call Test signal off Tap Call, then tap any other key Mic latched on Tap Headset or Panel Mic (key is green) Mic latched off Tap Headset or Panel Mic Mic momentary on Hold Headset or Panel Mic Mic momentary off Release Headset or Panel Mic VOX mode on Tap twice: Headset or Panel Mic (key is orange) VOX mode off Tap Headset or Panel Mic

All talk on All talk off Release All Talk

Public address Hold PA when Headset or Panel Mic is lit (PA key is green) Mic kill, one channel

Mic kill, all channels

Program on Program off Hold Mic Kill, then tap channel’s Talk key. Tap Mic Kill to exit. Audible call alert on Audible call alert off Hold Mic Kill, then tap either Call. Tap Mic Kill to exit.

Turn Mic Kill key off Tap Mic Kill Talk latched on Tap Talk (key is green) Talk latched off Tap Talk Talk momentary on Hold Talk Talk momentary off Release Talk Call signal on Hold Call Call signal off Release Call Receive call signal (Call key blinks red) Listen latched on Tap Listen (key is green) Listen latched off Tap Listen Listen momentary on Hold Listen

Hold All Talk when Headset or Panel Mic is lit (All Talk key is

green)

Tap Mic Kill, then tap Talk or Listen (Mic Kill key will blink green,

and the Talk and Listen keys are green). Tap Mic Kill to exit.

Tap Mic Kill, then tap All Talk (Mic Kill key will blink green, and all

Talk and Listen keys are green) Tap Mic Kill to exit.

Hold Mic Kill, then tap channel’s Talk key (key is green). Tap Mic

Kill to exit.

Hold Mic Kill, then tap either Call (all Call keys are red). Tap Mic

Kill to exit.

TELEX COMMUNICATIONS, INC. 9600 Aldrich Ave. So., Minneapolis, MN 55420 U.S.A.

9350-7550-000 Rev. B1, 2/99

Telex Audiocom US2000A User Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual