6-12
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
September 2005
Chapter 6 Turn Up Network
NTP-G56 Verify the OSNR
d. Click the desired termination slot/port from the list of available slots/ports.
Step 6 Click OK.
Step 7 If you provisioned a patchcord on a port in a 1+1 protection group, a dialog box appears to ask if you
would like to provision the peer patchcord. Click Yes . Repeat Steps 3 through 6.
Step 8 Return to your originating procedure (NTP).
NTP-G56 Verify the OSNR
Step 1 Complete the “DLP-G46 Log into CTC” task on page 2-25 at an ONS 15454 on the network.
Step 2 Using an optical spectrum analyzer, check the received OSNR for each transmitted channel on both ends
of the span. Identify the last OSC-CSM, OPT-PRE, or OPT-BST MON port that the channel passes
through 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.
Note For OSNR values for each card class, refer to Chapter 16, “Card Reference.”
Step 3 If the OSNR is too low, check the following, depending on your node configuration:
Note 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 RX port power range.
• Check the fiber connections between the OPT-BST or OSC-CSM and the OPT-PRE amplifier. If
needed, clean the connectors. See the “NTP-G115 Clean Fiber Connectors” procedure on
page 13-25.
• 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.
If the OSNR is still too low, contact your next level of support.
Step 4 Repeat Steps 2 and 3 for all traffic in the network.
Stop. You have completed this procedure.
Purpose This procedure verifies the optical signal-to-noise ratio (OSNR). The
OSNR is the ratio between the signal power level and the noise power level.
Tools/Equipment Optical spectrum analyzer
Prerequisite Procedures DLP-G46 Log into CTC, page 2-25
Required/As Needed As needed
Onsite/Remote Onsite
Security Level Provisioning or higher
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