Power Failure Transfer Unit Wiring - Vodavi XTS-IP Installation Manual

3-70
Chapter 3 - System Installation

Power Failure Transfer Unit Wiring

The Power Failure Transfer Unit (PFTU) is wired from the 25-pair connector to the MDF, cross
connected to the CO Line inputs from the telephone company, to the CO Line inputs of the
system, and to Power Failure SLTs.
The diagram in
the amphenol cable (It uses the first 4 pairs on the block. The next circuit uses the next 4 pairs,
etc.) The relay is a DPDT (Dual Pole Dual Throw). There are a total of 6 relays on the PFTU.
When the power is ON, the relay connects COR1-IN to COR1-OUT and COT1-IN to COR1-OUT.
When the power is OFF, the relay switches so that the relay now connects COR1-IN to TEL1-R
and COT1-IN to TEL1-T.
The basic connections of circuit 1 are shown in
configuration is given in
shown in the figure.
XTS-IP - Installation Manual
Figure 3-44 shows the wiring for the first of six circuits wired consecutively on
The SLIBE Subscriber (SLIB1-R and SLIB1-T) is only a connection so that the SLTs
can also be used off the SLIB card. There is no relay connection involved with this
pair. It is always connected to the SLIB card. When the power is ON, the relay is not
connected to the SLIBs. When the power is OFF, the KSU SLIB is not powered up and
the SLTs are now connected to the CO lines.
Table 3-23. Note that the SLT may also be connected to a SLIB as
BL/WH
CO LINE
WH/BL
OR/WH
LCOBC
WH/OR
GN/WH
SLT
WH/GN
BN/WH
SLIBE
WH/BN
Subscriber
Figure 3-44: PFTU Wiring Example (Circuit 1)
Figure 3-44 and the total connector
MDF (PFTU)
COR1-IN
COT1-IN
COR1-OUT
COT1-OUT
TEL1-R
TEL1-T
SLIB1-R
SLIB1-T
System Wiring
December 2005