You hav to connect the pp74xx e1 card to the pbx dti or pri card.one to one. One of the PP cards will be providing the clocking to the pbx card.
From the PP e1 card connection will go the Ds1/E1 panel if you are using a multiple port e1/t1 card. from there it gets fan out and goes to the pbx.
Else if u r using a single port e1 card it goes directly.
let me know if any more on this.
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