AT&T System 85 Installation And Test page 122

Adjust the fiber-optic link as follows:
1. On the AE W3, in the transmit LCIT, set the switch 1 to TEST. (See Figure 69.)
2. Insert 401M as attenuator A.
3. Set Switch 2 (FULL or HALF), and insert Attenuator B according to Table AJ
4. Determine the condition of the fiber-optic link by observing the LEDs on the receiver
and AE W3.
a. If one green LED lights, the link is within the required power range.
b. If both LEDs are red, the link is in an overdriven condition.
c. If a single LED is red, the link is in an underdriven condition.
5. Adjust the fiber-optic link if overdriven or underdriven by changing the power level
settings on the Transmit AEW3 and/or replacing the 401-series attenuators at the
Receive LCIT with different values (see Table Al). If the link still doesn't fall into
adjustment, use the information in the flowchart shown in Figure 71. Adjust until the
out-of-range condition is eliminated.
6. Return Switch Ito the Normal Mode. Disregard LED indications when operating in the
Normal Mode.
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