Peripheral Installation

Power Failure Options

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 Chapter 1 – Installation.

Power Failure Transfer Unit

An optional Power Failure Transfer Unit (DPFT) can be installed that automatically connects up to eight selected CO lines directly to designated standard telephones in the event of a power failure. The DPFT enables 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 system standard telephone circuit ports after it is finished with its direct CO line call. The DPFT is normally installed on the MDF.

Figure 12-25provides a circuit diagram of the DPFT.

To RSTU/PSTU-T1

J2-27

RDSU/RSTS

 

To RSTU/PSTU-R1

J2-2

RDSU/RSTS

 

 

Telephone Current

 

Detector

To RCOU/PCOU-T1

J1-27

 

To RCOU/PCOU-R1

J1-2

 

DG (Input)

J1-50

 

 

Relay

RSTU or PSTU

 

Control

 

-24V (Input)

J1-25

 

J2-26

To TEL-T1

J2-1

To TEL-R1

J1-26 To CO-T1

J1-1 To CO-R1

1498

Notes

Representation of first of eight circuits.

Conditions shown with AC power (-24VDC) off.

Figure 12-25 DPFT Circuit Diagram

Peripheral Installation

Strata CTX I&M 06/04

12-25

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Image 481
Toshiba CTX28 manual Power Failure Options, Power Failure Transfer Unit, 12-25