Clear-Com AB-120 - Manual (Page 12)

Clear-Com Communication Systems
AB-120 Announcer Console Instruction Manual
1 - 6
The connector is also 5 pin compatible and most standard intercom
headsets can be directly plugged into the unit.
Options
The construction of the AB-120 lends itself to modification. The 6 pin
XLR could be replaced with a 5 pin XLR.
Next to the headset connector is a 1/4 inch hole intended for the user
to install a stereo phone jack for a separate set of headphones.
The 8 pin header on the printed circuit board that the headset connects
to has circuits available for preening of electret microphones.
Mic Out Connector
The Mic Out connector provides a feed of microphone input after
amplification. The connector is an XLR-3M and is as follows:
• Pin 1 = ground shield
• Pin 2 = +ve mic output
• Pin 3 = -ve mic output
Intercom Line Connectors (XLR 3 male and female)
The AB-120 has a male and female pair of XLR 3 connectors for the
intercom line. The male/female pair of connectors are wired paralleled
and intended for loop through connection.
The pinout of the connectors when used with a Clear-Com party-line
system is as follows (place the channel select switch to 2):
• Pin 1 - ground shield
• Pin 2 = power (+25 to +30 VDC)
• Pin 3 = audio
The pinout of the connectors when used with TW(RTS) intercom
systems is as follows (place the channel select to the desired channel):
• Pin 1 - ground shield
• Pin 2 = audio 1 and power (+25 to +30 VDC)
• Pin 3 = audio 2
IFB (XLR 3 female)
The AB-120 has female XLR-3 connectors for the IFB input and is as
follows:
• Pin 1 - ground shield
• Pin 2 = IFB 1 and power (+25 to +30 VDC)
• Pin 3 = IFB 2