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Cisco Bug: CSCvs91674 - NSC1004 L-Band: For Traffic modes >4.0bps UCB/s can occur at ramp to cold Temp

Last Modified

Mar 18, 2020

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases


Description (partial)

When traffic is configured to bps >4.0 (15%FEC and 27%FEC) traffic hits (UCB) can occur when ambient temperature is ramping down by a delta T >35degC

Present with all  L-Band 1.2TLinecard HW 10-3400-01  and independent from SW release used.
Reproducibility <10% with temp ramp delta of 55degC (problem present on ~3 % of the cards)
Problem is induced by spontaneous ITLA frequency variation, the DSP tracking cant follow. 
Cause effect mechanism on ITLA net yet understood
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