Merlin 3070 Service And Maintenance Manual page 168

SERVICE CONNECTIONS
Power Failure Transfer Telephone (PFTT) jack: This jack is a 4-pair modular jack. (See
Figure 3.) Either a single standard telephone, or, with the use of a 4-way adapter
Z609A, four standard telephones may be connected. A single standard telephone con-
nected to the PFTT jack will be automatically connected to line A0 in case power to
the control unit is interrupted. When the 4-way adapter is used, the telephones will be
connected to lines A0. A1. B0 and B1. as indicated in Figure 3.
POWER FAILURE
TRANSFER
TELEPHONE
MAY BE
PART OF
JACK FIELD
LINE A0
LINE A1
LINE B0
LINE B1
Z609A
ADAPTER
Figure 3. PFTT Connections With and Without a Z609A Modular Adapter
Equipment manufactured by AT&T Technologies in the U.S.A.
MODULAR
LINE CORD
PART OF CONTROL UNIT
(LINE A0
ONLY)
MODULAR
TERMINAL CORD
(D8W)
CIB 3016