Connection To Tn763 Auxiliary Trunk Cp - AT&T Network Adapter 25 Installation And Maintenance Manual

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
l Paging equipment is not FCC registered.
l Paging equipment requires a contact closure
Connect as shown in Figure 2-56, following the steps
1.
Connect the CP to a 66-type block, using
Use kit-of-parts D-1 81524 (PEC 6251 1).
Note: The 66-block provides a 3-pair
(see Appendix A of this manual for details).
2. Using 4-pair inside wiring cable,
66-type block to a 278A adapter.
l T,R is the voice pair; SZ,SZ1 is
is the seizure acknowledge pair.
Open the 278A adapter, and install a strap between terminals BZ2
3.
and -V.
4. Move the yellow shorting plugs so that the following connections are
made (Figure 2-57).
D to C and J to K should be open.
2-124
connect the following leads on the
CP Leads* 278A Term.
T T
R R
B Z 1
S Z
SZl G R D
S B Y 1
S 1 B Y 2
the seizure request pair; and S,S1
A to B
E to F
G to H
exist:
for proper operation.
below:
an A25D 25-pair cable.
interface to TN763