Datasheet

PRODUCT DESCRIPTION
The Compact DSP Test Telephone is a “pocket size” fully featured instrument suitable for use by anyone involved in the
maintenance and installation of analogue telephone circuits.
Compact DSP (Digital Services Protection) Test Telephones are designed to operate safely in situations where
telephone wiring may be carrying Digital trafc, Voltage feed to remote electronics or Hazardous voltages that result
from fault conditions or misuse of the cable.
FEATURES
• Digital Service Protection (DSP)
• Over voltage & current protected
• Excessive voltage alarm
• Mains cross protection (230 VAC)
• 3 Position Volume boost
• Microphone Mute
• Hands free through optional headset
• Acoustic Shock Protection
• Battery low warning
• Tone/pulse dialling
• 32 Digit Last number redial
• Flash (Time Break Recall)
• Ground start & earth recall
• PBX Pause
• Super High impedance Polarity
• Super High impedance Monitor
• High Monitor sound level
• Warble ringer
• High impact resistance
• High chemical resistance
• Quick change cord
• Rugged belt clip
• PP3 battery (supplied)
• Basic telephony functions without battery
• Auto power down when not in use
• Polarity Indication
Digital Services Protection (DSP)
In the “on hook” mode, on connection to a circuit, the Test Telephone sounds an alarm to alert the user to the presence
of voltages above 75V DC. Such voltages are normally present on circuits carrying digital services. If the circuit is
active, the user can select MONITOR mode and listen to the sound to determine if the circuit is carrying digital services
without disrupting the trafc.
Selecting “off hook” mode will stop the alarm signal and loop the line without damage to the test set. If the alarm
signal persists, it indicates that the voltage on the line is above 120V. In this case the line is not looped avoiding
damage to the test set as well as alerting the user to the presence of hazardous voltages.
Compact DSP Test Telephone