3 - 26 Chapter 3Chapter 3 - Installing Extensions and Trunks3.14.1.3 Troubleshooting CO LinesFigure 3-16: CO Trunk TroubleshootingStartVerify the COIU bladeis functioning.Is the LiveStatus LED onthe COIU bladeflashing green?Remove the blade andinsert another COIUblade into the sameslot. Does it work?Screen the problem(whether problemexists in UX5000 orwith central office).The COIU blademay need repair.Main equipment(chassis/CCPU) mayneed repair.Connect a testterminal to theCO line side. Isdial tone heard?Contact the CO toinvestigate the line.Verify if the problem iswith the main equipmentor the CO line by using atest set before theconnection to the UX5000.Is the wiring for thecables correct?Redo the wires betweenthe main equipment andthe CO line.The COIU blade mayneed repair.YesYesYesNoNoNoYesNo* If it still does not work,replace the cable(s) and/or connectors.Check system programmingfor the extension. Refer tothe UX5000 SoftwareManual if necessary.Try placing a call on theCO line. Does it work? StopYesNoIs the blade blockedin Program 90-05? NoIs the LiveStatus LED onthe COIU PCBflashing green?Yes NoRelease the Blockin Program 90-05(enter 4) for the blade.StopCan a call be placedon the CO line?YesYesNoMeasure the loopcurrent on the line witha digital voltmeter.Is the PBXG grounding wirefrom the UX5000 attachedand is there a properearth ground?YesConnect the propergrounding wires forthe UX5000.NoCheck the EXIFU cableconnection betweenchassis with multiplechassis systems.No
