Replacing equipment Page 291 of 362Hardware replacement6 Disable the inactive IODU/C:Perform the following steps on the inactive Core.7 Set the ENB/DIS switch on the IODU/C with the faulty Security Deviceto DIS.8 Unhook the locking devices and remove the IODU/C.9 Remove the round 1/2” diameter IODU/C Security Device from theblack round Security Device holder on the top right corner of theIODU/C card.10 Locate the round 1/2” diameter IODU/C replacement Security Device.11 Make sure the 8-digit code on the Keycode diskette matches the 8-digitcode on the replacement Security Device.12 With the Nortel side facing upward, slide the replacement SecurityDevice between the security device holder and the holder clip. Do notbend the clip more than necessary when inserting the Security Device.Ensure that the Security Device is securely in place.13 Reinsert the IODU/C into the following slots:— For NT5D21 Core/Net Modules, insert the IODU/C in slots 17,18,and 19.14 Lock the locking devices by pushing them gently towards the faceplate.Set the ENB/DIS switch to ENB.A blinking letter “E” and number “5” displayed indicates that a failureoccurred. In that case, reseat the Security Device in its holder and reinsertthe card.15 Enable the IODU/C in LD 137:LD 137 to load the programSTAT to find the status of the IODU/CsDIS CMDU x to disable the CMDU part of the inactive IODU/C xDIS IOP x to disable the IOP part of the inactive IODU/C xSTAT to see the status of the IODU/CsENL CMDU x to enable the CMDU part of IODU/C xENL IOP x to enable the IOP part of IODU/C x
