Clear-Com Cellcom Instruction Manual download pdf (Page 9)

Vitec Group Communications

BAL-8 Ground Isolation Interface Instruction Manual

2-1

INSTALLATION

This chapter describes how to install the BAL-8 ground isolation

interface.

Description

The BAL-8 provides eight channels of transformer isolation for direct

interface ports on 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 2-1), the data pairs are not

affected. In Interface mode (Figure 2-2), each data pair (i.e. call

receive and call and call send) is connected, indicating to the Eclipse

status software that the port is in “direct” mode.

Figure 2-1: BAL-8 in Normal Mode (equivalent schematic)

Figure 2-2: BAL-8 in Interface Mode (equivalent schematic)

INSTALLATION IN A MATRIX

Once the BAL-8 is mounted, all connections are made between the

source, the Eclipse frame, and destinations, public-address systems,

radio receivers, etc., via RJ-45 jumpers. A complete connection

includes two RJ-45 jumpers—one connecting a Eclipse port to an

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Clear-Com Cellcom Instruction Manual Page 9