Instruction manual

Features
Privacy
90 Strata CTX General Description 10/04
Strata CTX features available to a normal standard telephone. This feature requires an external unit
called the Power Failure Transfer Unit (DPFT).
Each DPFT provides interface for eight power failure telephones. A Standard Station Interface
(RSTU) circuit card is required to supply the DPFT with a -24VDC control power and ground
connections. The number of Power Failure telephones available depends on system configuration.
The system maximum is 264.
Reserve Power Battery Backup
Two or four 12-volt gel-cell, maintenance-free batteries can be connected to the CTX system
power supplies for system battery backup (80 amps./hours max.). The CTX670 system power
supply is standard-equipped with a battery charger and the batteries continuously trickle charge to
capacity while electrical power is present. The CTX100 power supplies must be equipped with the
optional ABCS battery charger to charge reserve power batteries.
If the AC power fails, the Strata system automatically switches over to battery power without any
interruption in operation. Calls in progress are not interrupted. Battery operation duration depends
upon the condition and ampere hour rating of the batteries and the system load. However, the
minimum battery operation time would be several hours. Connection of reserve power batteries
must be made when commercial AC power is available.
Privacy
System Availability: All systems
Privacy prevents intrusion on calls that appear on shared (common) [DN] or line buttons. If a
telephone has a call on a [DN] or line button that appears on other telephones, the other telephones
cannot intrude on the call by pressing the shared button unless the intruding telephone has the
Privacy Override feature or the telephone with the call activates the
Privacy Release button.
Repeat Last Number Dialed
System Availability: All systems
This feature enables a digital station to automatically redial the last number dialed from their
station by selecting an outgoing line and pressing the
Redial button or by dialing an access code.
Digital key telephones have a fixed
Redial button for automatic redialing of the last number
dialed.
Ringing
System Availability: All systems
Ring Over Busy
When a digital telephone is busy on a call and then receives an internal or external call on an idle
[DN] or line button, the button will automatically flash and ring with Ring Over Busy tone. The
tone burst can either be sent two times (three seconds apart) or repeated continuously every three
seconds or not sent as a station option. To answer a Ring Over Busy call, the user can hold, transfer
or disconnect the existing call.
On Voice First calls to a busy telephone that has an idle [DN], the caller will get busy tone. The
caller can then dial the digit
1 to cause the idle [DN] to Ring Over Busy.