Ntp-G56 Verify The Osnr - Cisco ONS 15454 DWDM Installation And Operation Manual

NTP-G56 Verify the OSNR

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Stop. You have completed this procedure.
NTP-G56 Verify the OSNR
Purpose
Tools/Equipment
Prerequisite Procedures
Required/As Needed
Onsite/Remote
Security Level
Step 1 Complete the
Step 2 Using an optical spectrum analyzer, check the received OSNR for each transmitted channel on both ends
of the span:
a.
b.
Note
If the OSNR is too low, check the following, depending on your node configuration:
Step 3
Note
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Stop. You have completed this procedure.
Cisco ONS 15454 DWDM Installation and Operations Guide, R4.7
5-14
Changing the VOA power and attenuation calibration values adjusts the power and attenuation
reference settings.
This procedure verifies the OSNR. The OSNR is the ratio between the signal
power level and the noise power level.
Optical spectrum analyzer
DLP-G46 Log into CTC, page 2-25
As needed
Onsite
Provisioning or higher
"DLP-G46 Log into CTC" task on page 2-25
Identify the last OSC-CSM, OPT-PRE, or OPT-BST MON port before the channel is dropped. If
OPT-PRE cards are installed with an OPT-BST or OSC-CSM card, use the OPT-PRE MON port.
Determine the OSNR values based on the optical spectrum retrieved. These values must be
consistent with the OSNR values provided by the MetroPlanner installation file, +/– 1 dB. The
MetroPlanner OSNR values are only valid for the receive locations of a dropped channel. Therefore,
OSNR values of an OADM express channel cannot be compared to the MetroPlanner values.
For OSNR values for each card class, refer to
The purpose of this step is not to improve the signal-to-noise ratio (SNR), but to match the
per-channel power level within the receive (RX) port power range.
Check the fiber connections between the OPT-BST amplifier or the OSC-CSM and the OPT-PRE
amplifier and if needed, clean the connectors. See the
procedure on page 11-32.
On the near-end OPT-BST amplifier, check the equalization of the added channels at the monitor
output.
On the OPT-PRE amplifier, check the output power on both COM TX and DC TX ports.
On the far-end OPT-PRE amplifier, check the amplifier gain tilt at the monitor output.
Chapter 5
at an ONS 15454 on the network.
Chapter 14, "Card Reference."
"NTP-G115 Clean Fiber Connectors"
Turn Up Network
November 2004