4 - 62 Chapter 4Chapter 4 - Terminals and Optional Equipment4.15.3 Installing the Power Failure Terminals:1. Connect an RJ-61 connector to the CN3 power failure port on the COIU blade installed in theUX5000 system.2. Install a modular jack for each single line terminal supporting PF operation (2 per COIU). Themodular jack should be within six feet of the terminal.3. For each extension, run one-pair 24 AWG station cable from the cross-connect block to amodular jack.4. Terminate the extension leads to GRN/RED of the modular jack. Terminate the unused leadsto the jack.● When the power goes out, trunks 1 and 2 automatically switch to the SLT terminals toanswer/receive calls. Once the power returns, the trunks automatically switch back. Anycurrent calls can be complted first, then the trunks will switch back.Figure 4-31: POWER FAILURE CIRCUIT INSTALLATIONThe 4COIU blade with 4COIUDB is shown.CN2(COIU)Analog TrunkFrom Central Officefor Interface Circuit.#1-#4CN3SLT I/F forPower FailureTransfer#1-#2CN1CN4Trunk I/F Circuit #4 Daughter Board I/F(for COIU/082U)CN5CommonControlCircuitBUSY LED(Status for Trunk Lines)ON: Trunk in UseOFF: IdleLIVE LED(Status LED)Pin NumberLocation876521CN2(COIDB)Analog TrunkFrom Central Officefor Interface Circuit.#5-#8Trunk I/F Circuit #3Trunk I/F Circuit #2 Trunk I/F Circuit #1Trunk I/F Circuit #1Trunk I/F Circuit #2Trunk I/F Circuit #3Trunk I/F Circuit #4
