Balanced/Unbalanced Switch (SW1)
Set this switch to the balanced (BAL) position to use the US-2000 with
Audiocom® intercom channels. Set the switch to the unbalanced
(UNBAL) position for use with a Clear-Com® intercom system. (The
factory default setting is the balanced position for use with Audiocom®.)
Table 2. Jumper Functions And Settings
JUMPER
NUMBER
JUMPER FUNCTION
DEFAULT
SETTING
J7
Program 1 Local Listen
Both pins shorted: Program 1 audible in local
headset or speaker during CH1 listen
No pins shorted: Program audio not audible
No pins
shorted *
J8
Program 2 Local Listen
Both pins shorted: Program 2 audible in local
headset or speaker during CH2 listen
No pins shorted: Program audio not audible
No pins
shorted *
J16
Balanced/Unbalanced Headset Mic Select
Pins 1&2 shorted: Unbalanced
Pins 2&3 shorted: Balanced
Pins 1&2
shorted
J17
Clear-Com / Audiocom Mic Level Select
Pins 1&2 shorted: Clear-Com
Pins 2&3 shorted: Audiocom
Pins 2&3
shorted
J19
Channel 1 20-kHz Call Receive enable/disable:
Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled
Pins 2&3
shorted
J20
Channel 2 20-kHz Call Receive enable/disable:
Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled
Pins 2&3
shorted
J21
DC Call enable/disable: Makes the US-2000 compatible with
Clear-Com DC call signalling
Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled
Pins 1&2
shorted
J22
Multi-Channel Speaker enable/disable:
Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled
Pins 2&3
shorted
J23
Single Channel Speaker enable/disable:
Pins 1&2 shorted: Enabled
Pins 2&3 shorted: Disabled
Pins 2&3
shorted
J24
Multi-Channel Speaker Sidetone enable/disable:
Pins 1&2 shorted: Disabled
Pins 2&3 shorted: Enabled
Pins 1&2
shorted
* For no pins shorted, the jumper is placed on one pin only.
12
