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Chapter 4 Setup and Operation

6 Set the receiver module attenuator switch as follows:

IF received optical power is...

THEN set the attenuator

switch to...

Standard Receiver

—2 to +2 dBm

-8 dB

-6 to -2 dBm

0 dB

Low Input Receiver

-6 to -2 dBm

-8 dB

-10 to -6 dBm

0 dB

7 For standard input receiver, check the RF level at the -20 dB RF test point on each

forward path receiver. Signal level should be +7 dBmV at the test point with 0

dBm optical input power and 2.5% index modulation of the laser headend

transmitter. (With optical receiver attenuator set to the -8 dB switch setting.) This

represents an optical receiver output of +27 dBmV. For low input receiver follow

the same process to check the RF level and refer the table below.

For standard receiver

For low input receiver

Att/OMI

Output level

27dBmV

8 dB/2.5%

Input optical

power

0dBm

-4dBm

8 dB/2.5%

8 The next step depends on your RF output levels.

IF your RF output ports will...

and you have...

THEN...

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