AT&T 518-600-016 manual Installing the Control Unit

Adding a Shield to a When you add an expansion carrier, you must install a Power Supply Module second Power Supply Module in it to power the additional

line and/or station modules. The second Power Supply Module may induce excessive noise on the new line or station module immediately to its right. Copper foil shields can be installed to eliminate this noise. These shields are packaged in the 391A Power Unit Shielding Kit included with the expansion carrier.

Before installing the Power Supply Module on the expansion carrier, install a copper-foil shield as follows:

1Lay the Power Supply Module on a flat surface with the right (as viewed from the front edge) side up.

2Wipe the right side of the module free of any dust or dirt.

3Peel the backing paper from the smaller copper foil shield to expose the adhesive.

4Position the foil on the upper part of the module being sure to tuck the foil tightly into the comer as shown in Figure 2-18.Work out any air bubbles as you press the foil firmly in place.

CAUTION: Make certain of the position of the foil before adhering it to the side of the module. Once in place, the foil is difficult to remove.

5Peel the backing paper from the larger copper foil shield to expose its adhesive.

6Position the foil on the lower part of the module as shown in Figure 2-18.Work out any air bubbles as you press the foil firmly in place.

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