Clear-Com BAL-8 - Manual (Page 11)

Vitec Group Communications
BAL-8 Ground Isolation Interface Instruction Manual 3 - 1
MAINTENANCE
This chapter provides maintenance information for the BAL-8 and how
to install it.
DESCRIPTION
The BAL-8 provides eight channels of transformer isolation for direct
port interfaces to the Eclipse matrix. The transformer isolation
eliminates the hum and noise caused by ground loops. Each channel
handles four signals (two bi-directional audio and two RS-422 data
lines).
With the easy-to-operate slide switch, located to the right of each
Input/Output connector pair, you can place each channel in Normal or
Interface mode. In normal mode (Figure I7-1), the data pairs are not
affected. In Interface mode (Figure I7-2), each data pair (i.e., call
receive and call send) is connected, indicating to the Eclipse status
software that the port is in “direct” mode.
Figure 3-1: BAL-8 in Normal Mode (equivalent schematic)
Figure 3-2: BAL-8 in Interface Mode (equivalent schematic)
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