Hardware Description
5
Alero 8-Channel Microphone Mixer Instruction Manual
Microphone Inputs
The eight 3.5 mm 3-pin captive-wire microphone input connectors (FIG. 10) provide the following features:
Support up to eight mono microphones
Supports Balanced and Unbalanced audio
Microphone Input Level: +20 dBu (maximum)
0 dBu (nominal)
Microphone Input Impedance: Line Input: 50 k
Ω
Microphone: 10 k
Ω
Microphone Input Gain: -72 - 104 dB
Phantom Power: 48 volt all inputs
Mute Group
Alero provides users the ability to set the eight microphones into five mute groups. These five groups are muted using an external
contact closure. The contacts, connected through the 5-pin 3.5mm Phoenix connector labeled MUTE (FIG. 11), provide a
connection to ground to mute the microphone inputs assigned to the corresponding group through the web interface.
USB Port
The USB port provides a serial bus using a Standard-B connection on the Alero. It can be used to provide audio signals to and from
a PC in certain conference room applications.
The USB Pin-out:
FIG. 9
PA Speaker Connector Pin-out
FIG. 10
Microphone Input Pin-out
FIG. 11
Mute Group Input Connector
FIG. 12
USB Port Pin-out
Pin
Name
Cable Color
Description
1
VCC
Red
+5 VDC
2
D-
White
Data -
3
D+
Green
Data +
4
GND
Black
Ground