Power Failure Transfer Unit - Toshiba Strara CTX Series Installation And Maintenance Manual

Power Failure Options
In the event of a power failure, Strata CTX uses these options:
Reserve Power
For information on the Reserve Power Option, see in
Power Considerations" on Page

Power Failure Transfer Unit

An optional Power Failure Transfer Unit (DPFT) can be installed that automatically connects up to
eight selected Exchange lines directly to designated standard telephones in the event of a power
failure. The DPFT enables normal operation of the selected Exchange lines and standard telephones
when the system is in service. When power is restored, each telephone is independently reconnected to
system standard telephone circuit ports after it is finished with its direct Exchange line call. The DPFT
is normally installed on the MDF.
Figure 8-26 provides a circuit diagram of the DPFT.
The DPFT option is only available with annlogue exchange lines.
Note
To RSTU/PSTU-A1
To RSTU/PSTU-B1
To PCOU/RCOU/RCOS-A1
To PCOU/RCOU/RCOS-B1
DG (Input)
RSTU or PSTU
Control
-24V (Input)
Figure 8-26 DPFT Circuit Diagram
Strata CTX I&M September 2002
1-31.
J2-27
J2-2
Telephone Current
Detector
J1-27
J1-2
J1-50
J1-25
Notes
• Representation of first of eight circuits.
• Conditions shown with AC power (-24VDC) off.
Chapter 1, "CTX Primary AC and Reserve
J2-26
J2-1
J1-26
J1-1
Relay
Peripheral Installation
To TEL-A1
To TEL-B1
To Exchange
line -A1
To Exchange
line -B1
1498
8-27