Applies to Brocade Description How to determine SFP or cable faulty, review the porterrshow output from the switch. enc out errors alone imply primarily a cable issue. enc out and crc err in combinati...Applies to Brocade Description How to determine SFP or cable faulty, review the porterrshow output from the switch. enc out errors alone imply primarily a cable issue. enc out and crc err in combination primarily imply a GBIC/SFP problem. disc c3 combined with c3 timeout tx suggest SFP faulty.