Troubleshooting guide

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Release Notes for Cisco ONS 15454 Release 7.0.2
OL-11368-01
Caveats
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During a Y-Cable protection switch, the client interface sends 200,000 to 300,000 8B/10B errors towards
the attached Catalyst 3550 switch. The switch reacts to this large amount of 8B/10B errors by
reinitializing the interface and spanning tree. The end result is that a protection switch can lead to a 30-45
second traffic hit if the switch is running spanning tree (default mode). This is expected behavior.
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In a Y-Cable protection group, if GCCs are defined on both cards, both cards' active LEDs will be green.
This is by design.
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For the TXPP, attenuating Port 2 Rx signal, SD, and SF alarms are not declared before LOS-P is raised.
This is due to the intrinsic design of the optical interface, which allows required BER performances with
dispersion and OSNR penalties.
This can occur when Port 2 is in back to back or has low dispersions and high OSNR.
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The ACTV/STBY LED shows AMBER when a 2.5G transponder is first connected. The DWDM cards
introduced a new design: When all the ports are OOS on a card, the card is considered to be in standby
mode.
Interoperability
CSCds13769: Fujitsu FLM-150 and Nortel OC-3 Express
You cannot provision the FLM-150 and OC-3 Express in 1+1 revertive switching mode. The problem
occurs when the ONS 15454 issues a user request in revertive mode to the protect channel. When the
user request is cleared, the ONS 15454 issues a No Request. However, the FLM-150 and OC-3 Express
issues a Do Not Revert, which causes traffic to remain on the protection channel. Based on Telcordia
GR-253, section 5.3.5.5, the FLM-150 and the OC-3 Express should respond with a No Request.
BLSR Functionality
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A VT traffic hit up to 140 ms can occur when an intermediate node of the VT circuit is isolated. For
example, if you have three nodes, A, B, and C, where the circuit is routed from A to C via B, when you
isolate Node B, Nodes A and C perform STS-level 100 ms squelching as a part of the VT squelching
process. However, the timer resolution on the cross connect card yields 16 2/3 ms accuracy, so the 100
ms timer sometimes (about 80% of the time, depending on the number of VT circuits on a ring) expires
approximately 17 ms delayed. This causes VT traffic to be squelched for slightly more than 100 ms. Due
to system limitation of timer resolution accuracy and task scheduling delay, there is no further
optimization available in the current 15454 BLSR design.