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Spirent KB Article
Doc ID: FAQ19029
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Spirent TestCenter: FCS errors on 100G test module
Environment/Versions
Issue: B2B getting FCS
Case 1 - Module: FX3-QSFP28-4 LR4 / AN-OFF / FEC-OFF)
Speed: 100 G
STC version: 5.05
LR4 Transceivers
Source photonics - SPQCELRCDFB
Finisar - FTLC1154RDPL
Finisar - FTLC1151RDPL2
Case 2 - Module: MX3-100GQ-T2 LR4 / AN-OFF / FEC-OFF)
Speed 100 G
STC version: 5.11
LR4 Transceivers
Finisar - FTLC1154RDPL
Case 3 - Module MX3-100GQ-T2 (SR4)
Speed 25G
STC version: 5.29
SR4 Transceivers
Avago - AFBR-89CDDZ-CS1 /AFBR-89CDDZ-CS1
Avago- SFBR-89CDDZ-CS5
Answer
Case 1 - FX3-QSFP28-4
Cause: Auto-detect is causing FCS to appear as soon as traffic stream starts in LR4 / AN-OFF / FEC-OFF
Solution 1: change to Manual - Optical
Go to Port > Advanced
Under De-emphasis and Main tap swing
Change to Manual
Change to Optical
Solution 2: change emphasis to 0/8/0
Go to Port > Advanced
Under De-emphasis and Main tap swing
Change to Advanced
Pre = 0, Post = 0, Main = 8
Case 2 - MX3-100GQ-T2
Cause: Output Amplitude from TestCenter is low.
Solution: Set hwmgrd to configure these optics with Rx Output Amplitude Control = 0x2 for all lanes.
This required a patch at the time (v5.11)
This has also been implemented into v5.15
Emphasis setting is set to Auto-Detect
Auto-Detect set the values to:
Pre = 0, Post = 10, Main =8
Case 3 - MX3-100GQ-T2
Cause: The Avago optics were not transmitting with the ideal settings. it’s possible that it was using the settings from a different Avago transceiver.
Solution: Changed the config to manual/optical on all Avago ports and left the setup running traffic over the weekend.
Attachments
Attachment
test results summary.JPG
Attachment Description
CR4 and LR4 FEC results
Version
4.0
Publish Date
2022-01-18
Categories
Product : MX3,FX3
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