Power Failure Options; Power Failure Emergency Transfer Option - Toshiba Strata DK 280 Installation Manual

This chapter provides connection procedures for
optional peripheral equipment to Strata DK280
systems. The instructions for each option include
hardware requirements, printed circuit board (PCB)
configuration, interconnection/wiring requirements,
and programming considerations.
Peripheral equipment is connected to system PCBs.
Refer to PCB Installation, Chapter 4-Printed Circuit
Boards for PCB installation and configuration
information.
6.1 Power Failure Options
Strata DK280 systems offer two options to protect
system operation in the event of a power failure: the
Reserve Power option and the Power Failure
Emergency Transfer option. Reserve power
installation is described in Chapter 3-Cabinet
Installation; power failure transfer installation is
described below.
6.1 .l Power Failure Emergency Transfer
Option
The Power Failure Transfer Unit (DPFT) provides a
means of automatically connecting up to eight
selected CO lines directly to designated standard
telephones in the event of a power failure. The DPFT
allows normal operation of the selected CO lines and
standard telephones when the system is in service.
When power is restored, each telephone is
independently reconnected to the system after that
telephone is finished with its direct CO line call. The
DPFT is normally installed on the Main Distribution
Frame (MDF).
Figure 6-1 provides a circuit diagram of the DPFT.
Power Failure Emergency Transfer Installation
Install the DPFT in accordance with the following
steps:
1.
2.
3.
4.
5.
6.
7.
Mount the DPFT on or near the MDF.
Note:
Refer to Chapter 7-Wiring Diagrams,
DPFT/MDF interconnecting tables.
Using 25-pair cables with amphenol-type
connectors (female for DPFT connector Jl, male
for DPFT connector J2), connect the DPFT to two
66-type quick-connect blocks.
Connect the CO lines selected for emergency use
to the DPFT Jl-block 'CO-TIP" and "CO-RING"
terminals.
Connect the RCOU (or PCOU) circuits relateo to
the emergency CO lines to the DPFT Jl-block
"RCOU-TIP" and "RCOU-RING" terminals.
Connect the standard telephone stations selected
for emergency use to the DPFT J2-block "TEL-
TIP" and "TEL-RING" terminals.
Connect the RSTU, RDSU/RSTS or PSTU
standard telephone circuits related to the
emergency standard telephones to DPFT J2-block
"PSTU/ RSTU-TI P" and "PSTU/RSTU-RI NG"
terminals.
Connect the DPFT to the RDSU/RSTU/PSTU DG
and -24V terminals (refer to Chapter -/-Wiring
Diagrams for RSTU/PSTU and RCOU/PCOU
wiring/interconnecting details).
January 1996
6-l