Chapter 3 - Installing Extensions and TrunksChapter 3 3 - 15SECTION 3-10INSTALLING DID TRUNKS3.10.1 DID Trunks (Figure 3-10)Direct Inward Dialing trunks must be bridged from the telco RJ21X to a line cross-connect (A) block. Each DIDTrunk requires one-pair cross-connect from the RJ21X to the line (A) block.The A block connects to the DID blade and an RJ-61 jack. The line (A) block should be arranged in groups of 4DID trunks (8 pins) or 8 DID trunks (16 pins) to correspond with the chassis slot equipped with a DIOPU blade.Installing DID TrunksFigure 3-10: INSTALLING DID TRUNKSIBridging Clips4 DIDTrunks8 DIDTrunksOne-PairXconnectDID Trunks5-12Not usedDID Trunks1-4DIOPU PCBLine"A" BlockTelcoRJ21X25-PairCableDIOPU PCB
