Telex ES-4000A Data Sheet
ES-4000A
Intercom Expansion Station
The ES-4000A is an Expansion Station for the US-2002 User Station. It interfaces four additional intercom channels to the US2002, and it provides talk, listen and call buttons for the four additional channels. There are also four additional program inputs
on the back of the ES-4000A, one for each added channel. Up to four ES-4000A Expansion Stations may be connected to the
US-2002 to add up to 16 channels (18 channels total). The ES-4000A typically utilizes the US-2002 microphone and speaker
(or microphone headset) for communication with the added channels. The ES-4000A also has individual speaker outputs for
independent monitoring of one or more of the 4 channels if desired.
Features
Simplied Expansion
The EMS-4001 integrates four powered channels with talk,
listen, and call controls in a single rackmount unit. Saves on
rackmount hardware and eliminates power supply to expansion station interconnect cables.
Compatibility and Flexibility
Connects directly to an MS-2002 or US-2002 Master Station
to add four complete powered channels. Or connects to a
previous EMS-4001 or ES-4000A Expansion Station to add
another four powered channels (up to 18 channels total).
Overload/Short-Circuit Protection
Provides automatic current limiting during short circuits or
overloads. Front panel fault indicator provided for each channel.
Line Drawing
Mic Kill
Turn off all microphones on a selected expansion channel, or
all channels, using the master station’s Mic Kill key.
Dedicated Program Inputs
Each expansion channel has its own program input. Connect any line-level audio source for monitoring in the master
station’s speaker or headset and for routing to the expansion channel if desired. When program audio is routed to
the channel it can be set to interrupt while the master station
operator is talking on the channel.
Binural (Stereo) Inputs
If the master station is equipped with external powered
speakers you can assign the EMS-4001 channels to either
right or left speaker.
Clear-Com™ Compatible
ES-4000A Specications
Contact Information
Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, Minnesota 55337
Telephone: (800) 392-0498
Fax: (800) 323-0498
Form Number: 38110-496
Date: February, 2006
General
Power Requirements:
Voltage:
Phantom Power: 24 VDC nominal (12 to 30 VDC)
Local Power (with PS-L Wall-pack Power Supply or
equivalent): 14 to 15 VDC
Current: 65 mA, quiescent; 150 mA maximum
Dimensions: 1.75” (44.5 mm) high, 8.25” (209.6 mm)
wide, 10.0” (250 mm) deep
Environmental Requirements:
Storage: -20°C to 80°c; 0% to 95% humidity, non-con-
densing
Operating: -15°c to 60°C; 0% to 95% humidity, non-
condensing
Intercom Channels, Balanced Mode (BAL / UNBAL
switch set to BAL position)
Output Level: 1 Vrms nominal
Input Impedance: 300 Ω
Bridging Impedance: greater than 10,000 ohms
Sidetone: -40 dB, 35 dB adjustable range
Call Signaling:
Send: 20 kHz ±100 Hz, 0.47 Vrms ± 2dB
Receive: 20 kHz ±800 Hz, 100 mVrms
Mic-Kill Frequency:
Send: 24 kHz ±100 Hz, 0.5 Vrms ± 2dB
Receive: 24 kHz ±800 Hz, 100 mVrms
Noise Contribution: less than -70 dB
Common Mode Rejection Ratio: greater than 50 dB
Intercom Channel, Unbalanced Mode (BAL / UNBAL
switch set to UNBAL position)
Output Level: 1 Vrms ±10%
Input Impedance: 150 Ω
Bridging Impedance: 10,000 Ω ±5%
Sidetone: -40 dB, 35 dB ±10% adjustable range
Call Signaling:
Send: 11 ±2 VDC
Receive: 4 VDC
Speaker Output
Level: 1.0 Vrms, ±2 dB (0 dB nominal)
Impedance: 1000 ohms nominal
Program Input
Voltage Gain Adjustment Range (program Input to channel output, with 100 mVrms input): 25 ±3 dB (2.6 Vrms
maximum, unit is factory-set to 1.0 Vrms)
Input Impedance: Balanced, 75 Kohm ±10%; unbalanced,
38 Kohm ±10%
Frequency Response
EXP IN to/from Channel, EXP IN to/from EXP OUT,
Channel to Speaker: 200 Hz to 8 kHz +1/-3 dB
Total Harmonic Distortion: Less than 0.5 %
Connector Pin-outs
12-15 VDC Jack
Connector Type: 2.0 mm DC jack
Internal pin: +12 to 15 VDC
External Ring: Common
EXP IN Jack
Connector Type: ⅛” (2.0 m) stereo phone jack
Tip: Listen input
Ring: Talk output
Sleeve: Common
EXP OUT Jack
Connector Type: ⅛” (2.0 m) stereo phone jack
Tip: Talk output
Ring: Listen input
Sleeve: Common
SPEAKER Jacks
Connector Type: RCA Phono jack
Tip: Speaker output high
Sleeve: Common
PROGRAM INPUTS Connector
Connector Type: DB-9F Female, 9-pin D-subminiature
Pin 1: Common
Pin 2: Channel 3 program in low
Pin 3: Channel 4 program in low
Pin 4: Channel 5 program in low
Pin 5: Channel 6 program in low
Pin 6: Channel 3 program in high
Pin 7: Channel 4 program in high
Pin 8: Channel 5 program in high
Pin 9: Channel 6 program in high
CHANNEL 3-6 OUTPUTS Connector
Connector Type: DB-15F Female, 15-pin D-subminiature
Pin 1: Channel 3 intercom audio input/output high
Pin 2: Channel 3 intercom audio input/output low
Pin 3: Common
Pin 4: Channel 5 intercom audio input/output high
Pin 5: Channel 5 intercom audio input/output low
Pin 6: Common
Pin 7: Common
Pin 8: Common
Pin 9: Common
Pin 10: Channel 4 intercom audio input/output high
Pin 11: Channel 4 intercom audio input/output low
Pin 12: Common
Pin 13: Channel 6 intercom audio input/output high
Pin 14: Channel 6 intercom audio input/output low
Pin 15: Power (30 VDC)
Ordering Information
ES-4000A
4 channel expansion station with 2.0 amp power supply with instantaneous auto reset in a single unit.
Catalog Number: 90007551000
This specications information is preliminary and is subject to change without notication.
Brand names mentioned are the property of their respective companies.
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