NEC Electra Elite 192, Hardware Manual

Page: 114 / 369

Issue 6 Electra Elite
4 - 10 Installing KSUs
2.5 Power Failure Transfer
The Power Failure Transfer relay is located in the KSU. When
selecting a Single Line Telephone for power failure transfer, make
sure it matches the CO line dialing type (10 pps, 20 pps, or DTMF)
where it is connected. A Single Line Telephone with a ground
button must be used with Ground Start Trunks.
Figure 4-2 Power
Failure Transfer Connections is a relay diagram. The relay is shown
with the power ON.
3 PFT Circuits for each B64-U10 KTU
Figure 4-2 Power Failure Transfer Connections
M
D
F
M
D
F
C
O
I
S
L
I
Relay 1
Tip
Ring
Tip
Ring
T
E
L
C
O
SLT