Instruction manual

Power Failure Transfer (PFT)
SYSTEM 25
CABINET
TRUNK
PORT
TAE
CALL
PROCESSOR
ETU
ETU TO SWITCH ETU TO
25-PAIR
(TRUNK) CO
-48V
CPU
TO
ADDITIONAL
ADDITIONAL
ETUs
ETU
CENTRAL
OFFICE
25-PAIR
OCTOPUS
ETU TO SWITCH
(LINE)
ETU TO
SIP
STATION
PORT
25-PAIR
CABLE
PART OF SIP
858A
ADAPT.
UP TO FIVE POWER FAILURE
TRANSFER (PFT) STATIONS
(REGISTERED SINGLE-LINE)
(a) ETU CONNECTIONS (DASHED LINES) NORMAL OPERATION - (NO PFT)
(TRUNK SUPPORTS STANDARD CO CALLS)
ETU
TAE
-48V REMOVED
CENTRAL
OFFICE
25-PAIR
TO PFT
STATION
(b) ETU CONNECTIONS (DASHED LINES) ON PFT
Figure 2-39.
Emergency Transfer Unit Connections
2-265