Cisco ONS 15454 SDH - Forward Error Correction

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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.6.6 Forward Error Correction
1.6.6 Forward Error Correction
In DWDM spans, FEC reduces the quantities of retiming, reshaping, and regeneration (3R) operations
needed to maintain signal quality. The following two PM parameters are associated with FEC:
• BIEC—Bit errors corrected (BIEC) indicates the number of bit errors corrected in the DWDM trunk
line during the PM time interval.
• UNC-WORDS—The number of uncorrectable words detected in the DWDM trunk line during the
PM time interval.
Complete the following procedure to provision BIEC and UNC-WORDS PM parameters for FEC.
Provision Card FEC Thresholds
Step 1 In node view, double-click the TXP_MR_2.5G card to open the card view.
Note In this example, other transponder and muxponder cards are also applicable, such as
TXP_MR_10G, TXPP_MR_2.5G, and MXP_2.5G_10G.
Step 2 Click the Provisioning > OTN > FEC Thresholds tabs (Figure 1-45).
Figure 1-45 Provision Card FEC Thresholds
Step 3
In the Bit Errors Corrected field, enter a threshold number, for example 225837.