Telex AUDIOCOM BP-2000 - Manual (Page 13)

CONNECTOR PIN CONFIGURATIONS
Headset Connector
Type: XLR-4M (callout 6 in Figure 1)
Pin 1 Headset microphone low
Pin 2 Headset microphone high
Pin 3 Headphone high
Pin 4 Headphone low
Intercom Channel Connectors
BP-1000
Type: One XLR-3M and XLR-3F pair (callout 8 in Figure
1)
Audiocom® Mode (Internal switch SW3 and jumpers
J2,
J5, J6 and J7 set to BAL position)
Pin 1 Common
Pin 2 Intercom audio low and +24 VDC input
Pin 3 Intercom audio high and +24 VDC input
Clear-Com Mode (Internal switch SW3 and jumpers
J2,
J5, J6 and J7 set to UNBAL position)
Pin 1 Common
Pin 2 +30 VDC input
Pin 3 Intercom audio/call signal
12