ADTRAN 25 manual Connection to TN763 Auxiliary Trunk CP 278A Adapter Required

INSTALLATION

Connection to TN763 Auxiliary Trunk CP (278A Adapter Required)

A 278A Adapter is required to connect paging equipment to a TN763 Auxiliary Trunk CP (Figure 2-56)when the following conditions exist:

l Paging equipment is not FCC registered.

l Paging equipment requires a contact closure for proper operation.

Connect as shown in Figure 2-56,following the steps below:

1.Connect the CP to a 66-type block, using an A25D 25-pair cable. Use kit-of-parts D-1 81524 (PEC 6251 1).

Note: The 66-block provides a 3-pair interface to TN763 (see Appendix A of this manual for details).

2.Using 4-pair inside wiring cable, connect the following leads on the 66-type block to a 278A adapter.

CP Leads*	278A Term.
T	T
R	R
S Z	B Z 1
SZl	G R D
S	B Y 1
S 1	B Y 2

l T,R is the voice pair; SZ,SZ1 is the seizure request pair; and S,S1 is the seizure acknowledge pair.

3.Open the 278A adapter, and install a strap between terminals BZ2 and -V.

4.Move the yellow shorting plugs so that the following connections are made (Figure 2-57).

A to B

E to F

G to H

D to C and J to K should be open.

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