Clear-Com i-Series Panels - Manual (Page 80)

11 Specifications
0 dBu is referenced to 0.775 volts RMS
11.1 BASIC PANEL
11.1.1 Front-Panel Controls and Connectors
Talk/Listen Buttons 6 (1 key module)
14 (2 key modules)
22 (3 key modules)
30 (4 key modules)
Function Buttons 4
Telephone Keypad Buttons (optional) 12
Answer Back Button 1
Clear Button 1
Volume Controls Main, Vol/Prog
Headset Connector XLR-4M only
Panel Mic Connector Locking 1/4-in. phone jack
Rear-Panel Connectors
To Matrix DB-15 (for 2-wire interfaces)
RJ-45 (for 4-wire interfaces)
Expansion Option RJ-45
Panel Microphone Input
Type Electret with proprietary phone jack
Input Level - 40 dBu
Gain Adjustment Range 0 to 20 dB
Impedance 200 Ohms
Headset Microphone Input
Type Dynamic
Input Level - 55 dBu
Gain Adjustment Range 0 to 20 dB
Impedance 200 Ohms
Line Input/Output
Type Transformer Balanced
Input Impedance 8k Ohms Bridging
Output Impedance 150 Ohms
Level 0 dBu nominal
Frequency Response 50 Hz to 15 kHz, ± 2 dB
Headphone Outputs
Impedance 50 to 600 Ohms
Power 1/2 W into 50 Ohms
80 I-Series Panels User Guide