Front Panel Controls and Connectors
Talk/Listen Switches: 32
Answer Back Switch: Configurable (None, 1 or 2)
Volume Controls: 2 (Main and Aux)
Headset Connector: 1 (XLR-4M or XLR-5F)
Panel Mic Connector: 1 (3-pin) USB “A”
Socket: 5V DC to 500mAh with short circuit and overload protection
Rear Panel Connectors
GPIO: DB-25F
Matrix: RJ45 (single-channel)
Matrix (IP): RJ45 (multi-channel)
Auxiliary Audio: DB-25M
Expansion Panel: RJ45 DC Power: 4-pin DIN
Headset Audio
Earphone Impedance: From 32 Ohms
Output Power: 75mW into 50 Ohms for <1% distortion
Loudspeaker Audio
Frequency Response: 40Hz-20kHz +/- 3dB
Panel Microphone Input
Type: Electret
Level: 40-70 dBu
Impedance: 1700 Ohms +/- 10%