State of the Art Test Equipment

TestPhone 850

TestPhone 850


The TestPhone 850 provides both handset and handsfree telephone communication. The product provides a standard Public Switched Telephone Networks (PSTN) interface, user interface and handset and/or handsfree vocal interface to allow the user to originate or answer standard PSTN calls on both Dual-tone Multi-frequency (DTMF - tone dialling) and Loop Disconnect (LD - pulse dialling) lines. In addition the product features on-hook audio line monitoring, PSTN line polarity indication, automatic on-hook/power-off and integral ADSL digital line filtering.


Main Features

Digital Line Compatible (Integral ADSL Filter) - DATASAFE

Two Way Hands Free

Eight Level Volume Control (Handset and Hands free)

Microphone Mute

Tone/Pulse Dial Selection with Indication

Ultra Hi-Z on/off-hook Line Polarity Indication

Hi- Z Speaker Monitor Mode with Four Volume Levels

Ultra Low Line Current with Over Current Protection

Low 0.1 REN (Ringer Equivalence Number)

Low Battery Indication

Full Telephone Parameter Set up via Keypad

Ten Ringer Melody’s ( 5 x 3- Tone, 5 x 2- Tone)

Hands Free Background Noise Compensation

13 x 21 Digit Memories (1 Speed Dial Memory)

Configurable Key Beeps

Quick Change Battery

Quick Change Cords or RJ11 Lead

High Impact Resistance

Fully Sealed to IP67

Rugged Belt Clip


For more information see:

JSD TestPhone 850 Data Sheet.pdf (39.6 kB)

TestPhone 850 Operation Manual.pdf (171.7 kB)

TestPhone 850 Photos


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JSD TestPhone Ltd Unit 11 Templars Way Ind Est
Marlborough Road
Royal Wootton Bassett
Swindon, Wiltshire
United Kingdom