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Cyan Z-Series Engineering and Planning Guide
Release 5.0
700-0023-05-00 Rev. 1
© 2013 Cyan, Inc. – All Rights Reserved.
P a g e
149
Configuring the LAD-8E Gain Parameters
Note: The default values should only be adjusted after consulting a Cyan system engineer to
determine the proper settings.
LAD-8E TX Pre-Amp attenuation should be set to 12.5dB. This value should not be changed. This
guarantees a valid optical input to the TX Amplifier.
LAD-8E TX Post-Amp attenuation and RX Amp Gain should be set based on span loss as shown in the table
below.
Span Loss
TX Pre-Amp
Attenuator
TX Post-Amp
Attenuator
RX Amp Gain
Less Than 30 dB
12.5
30 – Span Loss
15
Greater Than or Equal to 30 dB
12.5
0
Span Loss - 15
Note: The LAD-8E supports manual gain tilt control. Gain tilt can occur when channel gain is not
flat upon reaching the optical amplifier. In this situation, higher signals receive more power,
while lower signals receive less power.
Configuring the LAD-8X Gain Parameters
Note: The default values should only be adjusted after consulting a Cyan system engineer to
determine the proper settings.
LAD-8X TX Pre-Amp attenuation should be set to 7 dB. This value should not be changed. This guarantees
a valid optical input to the TX Amplifier.
LAD-8X RX Post-Amp Attenuator should be set to 10dB. This RX Post-Amp Attenuator can be used to
fine tune the RX Power at the XFP after all other adjustments have been made.
LAD-8X TX Post-Amp attenuation and RX Amp Gain should be set based on span loss as shown in the
table below.
Span Loss
TX Pre-Amp
Attenuator
TX Post-Amp
Attenuator
RX Amp Gain
RX Post-Amp
Attenuator
Less Than 32 dB
7
33 – Span Loss
22
10
Greater Than or Equal to 32 dB
7
0
Span Loss - 10
10
Note: The LAD-8X supports manual gain tilt control. Gain tilt can occur when channel gain is not
flat upon reaching the optical amplifier. In this situation, higher signals receive more power,
while lower signals receive less power.