Clear-Com Audio Connection, Balanced Configuration

FIGURE 4. Using a JB-2 Junction Box to split a 2-channel Audiocom cable into two 1-channel cables.

Clear-Com Audio Connection

1.Use standard Clear-Com 3-pin cables. Connect one Clear-Com party line to the J1A connector on the back of the DSI 2008 (System A). Connect a separate Clear-Com party line to the J1B connector (System B).

NOTE: The DSI 2008 features internal DC isolation. You can therefore connect the DSI 2008 to powered Clear-Com cables, and it will not draw any power from the Clear-Com system.

2.On the DSI 2008 front panel, set the System A and System B 2W CHAN SEL switches to position 2.

NOTE: If the System A or System B hybrid will not be used, set the 2W CHAN SEL switch to the OFF position and attach a dummy load to the TW XLR connector.

Other 2-wire Audio Connection

1.Use the J1A connector on the back of the DSI 2008 to connect one 2-wire line to the System A hybrid. Use the J1B connector to connect a second 2-wire line to the System B hybrid. The pin configuration for the J1A and J1B connectors depend on whether you are connecting a balanced or unbalanced 2-wire line, as follows:

NOTE: TW systems must provide termination on the audio channel.

Balanced Configuration

Pin 1 No Connection

Pin 2 Balanced Audio + Input/Output

Pin 3 Balanced Audio - Input/Output ** Termination 300 Ω

There are two possible configurations for unbalanced connection:

Unbalanced Configuration 1

Pin 1 Audio Common

Pin 2 Audio Input/Output

Pin 3 No Connection ** Termination 200 Ω