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MDS Microphone Discussion System
.Installation & Operation Guide
PRODUCT DESCRIPTION
The MDS microphone discussion system is a highly
flexible small to medium size tabletop discussion system
using a unique circuit loop design: easy to set up, using
standard Cat 5 cables for linking up to 20 units in a daisy
chain. The system accepts one chairman unit and up to 19
delegate units.
The power supply unit can be connected anywhere in the
chain, preferably in the middle of the system when more
than 10 units are connected. The chairman and power
supply unit can be located anywhere in the system. The
microphones are equipped with easily identifiable LEDs
on the base unit and the flexible gooseneck microphone.
Some models have a telescopic neck.
FEATURES
• The delegate unit MDS.DEL is equipped with a talk
button. When the microphone is active, the LED
indicator above the talk button and the colored LED
ring on the microphone is lit. Press the talk button to
activate the microphone. Press the talk button again
to deactivate.
• The chairman unit is equipped with a talk and mute
button. When the mute button is pressed, only the
chairman unit will be active. All delegate microphones
will be muted and deactivated. The LED on the
chairman unit will blink when the mute function is
active. It will light up steady when the talk button is
pressed (equivalent to the delegate unit).
SETUP AND USE
The interconnection cable is a Cat 5 standard straight
cable, according to EIA-568-B. Maximum cable length is
determined by the number of units in use. In a system with
20 units, the recommended maximum length between
each unit is 5 meters.
The Cat 5 cables are inserted at the rear of the MDS units.
Every unit has an IN and OUT connector, however, both
connectors are equivalent. It doesn’t matter where you
connect the Cat 5 cable.
Example: for a system with 9 delegate microphones and 1
chairman unit, you need:
• 1 x MDS.INT connection interface with power supply
• 1 x MDS.CHAIR chairman unit
• 9 x MDS.DEL delegate units
• 10 x standard straight Cat 5 cables (not supplied with the
MDS units)
• It is not necessary to have a chairman unit in a system. Only
one chairman unit can be used in a system.
• Do not speak loudly into the microphone from a short
distance. The ideal distance to the microphone is 15 to 50
cm.
• Only use the power supply supplied with the MDS.INT unit.
• Do not connect the Cat 5 cables from the MDS system to a
computer network, router or network switch.
• To prevent feedback noise, turn down the gain levels of all
units before operating the system.
• Maximum system cable length: 100 m (10 x 10 m - 20 x 5 m)
A: 9300 S.W. Gemini Drive Beaverton, OR 97008 USA W: www.biamp.com
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Parts and functions of the MDS.CHAIR unit
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1
4
5 6 8
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1. Chairman mute button
Press this button to mute all delegate units. The
LED on the base unit (2) and on the gooseneck
microphone (9) will blink. Press again to exit mute.
2. LED indicator
Lights up steady when the talk button (3) is pressed.
3. Talk button
Push to talk. The LED indicator on the base unit and
the gooseneck microphone will light up steady. Press
again to stop.
4. RJ45 out connector
Connect the Cat 5 cable here. Connector 4 and 5
have the same function.
5. RJ45 in connector
Connect the Cat 5 cable here. Connector 4 and 5
have the same function.
6. Power supply connector
Connect the power supply supplied with the MDS.INT
unit here. Only one supply connection is required for
the entire system.
7. Power LED
Green LED lights up when the unit is powered.
8. Gain adjustment
Adjust the gain (level) from the unit to match with the
level of other units in the system.
9. LED indicator
Lights up steady when the talk button is pressed.
Blinks when the mute button is pressed.
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page 2 Installation and Operation Guide Microphone Discussion System
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Parts and functions of the MDS.DEL unit
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1. Talk button
Push to talk. The LED indicator (2) on the base unit
and the gooseneck microphone (8) will light up. Press
again to stop.
2. LED indicator
Lights up steady when the talk button (1) is pressed.
3. RJ45 out connector
Connect the Cat 5 cable here. Connector 3 and 4
have the same function.
4. RJ45 in connector
Connect the Cat 5 cable here. Connector 3 and 4
have the same function.
5. Power supply connector
Connect the power supply provided with the MDS.INT
unit here. Only one supply connection is required for
the entire system.
6. Power LED
Green LED lights up when the unit is powered.
7. Gain adjustment
Adjust the gain (level) from the unit to match with the
level of other units in the system.
8. LED indicator
Lights up steady when the talk button is pressed.
3 4 5 7
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NOTE: Except under chairman priority mode, the delegate
unit(s) will shut off after approximately 5 minutes idle (no
sound).
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Microphone Discussion System Installation and Operation Guide page 3
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Parts and functions of the MDS.INT unit
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1. Audio in RJ45 connector
Connect the Cat 5 cable from the last unit in the chain
here.
2. Power LED
Lights up when the system is powered.
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3. Audio out
6.3 mm unbalanced jack connector: connect the audio
cable here. The nominal output level is 100 mV/1
k-ohm output impedance. This line level signal will
normally be connected to an amplifier or a pre-amp/
mixer.
4. System switch (C/S)
C = select if chairman microphone is used.
S = select if no chairman microphone is used.
5. Output level (MIC / LINE) switch
Select MIC or LINE to choose the output device.
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5
Accessories supplied with MDS.INT
NOTE:
"S" should not be selected when a chairman microphone
is part of a system as it will disable the microphone mute
function. Selecting "S" is intended to enhance system
stability when no chairman microphone is connected.
Legacy models of the MDS.INT do not include functions
4 and 5.
System power supply and 6.3 mm unbalanced jack cable:
NOTE: the power supply can power up to 20 units in a
daisy chain.
Output voltage is 15VDC/4.3A. The power supply has no
power on/off switch.
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Connection examples
Small microphone discussion system with 1 chairman unit and up to 9 delegate units: the power supply can be located at
the end of the chain where the MDS.INT is located. The chairman unit can be located anywhere in the chain.
NOTE: maximum 1 chairman unit (MDS.CHAIR) is allowed per system. The unbalanced audio output signal will normally
be connected to an amplifier or a pre-amp/mixer.
Medium microphone discussion system with 1 chairman unit and up to 19 delegate units: the power supply should be
located near the middle of the chain. The MDS.INT unit will be located at the end. The chairman unit can be located
anywhere in the chain.
NOTE: maximum 1 chairman unit (MDS.CHAIR) is allowed per system. The unbalanced audio output signal will normally
be connected to an amplifier or a pre-amp/mixer.
Microphone Discussion System Installation and Operation Guide page 5
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CONTACT US
Email: support@biamp.com
Web: support.biamp.com
Warranty: biamp.com/legal/warranty-information
Safety & Compliance: biamp.com/compliance
A: 9300 S.W. Gemini Drive Beaverton, OR 97008 USA W: www.biamp.com
MAY 2021
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