IT-4401 DTMF Telephone Trainer

Basic working principle of a telephone is very important in telecomm. This trainer helps students understand the functional working of an actual telephone. It provides in depth explanation of the different sections of a DTMF Telephone. Test points are provided to observe different signals which help in understanding different blocks of a Telephone.

Description

Basic working principle of a telephone is very important in telecomm. This trainer helps students understand the functional working of an actual telephone. It provides in depth explanation of the different sections of a DTMF Telephone. Test points are provided to observe different signals which help in understanding different blocks of a Telephone.

 

Features:

Required Circuits Tested

Each Section Clearly Marked for Input and Output

Polarity Protection

Monolithic Dialer, Ringer and Driver

Each Section Clearly Marked for Easy Understanding

 

Technical Features:

Operation: Stand Alone

Input Power: From Telephone Line

Handset: Handset connection Port (RJ11)

Dial Pad: 4 × 4 Matrix Key Pad

Dialer Section: DTMF (Tone) and Pulse Dialing Redial upto 32 digits with Hook Switch detection

Indication: Line On / OFF Pulse Dialing Indication, Tone Dialing Indication

Control: Ringer Volume Control

Dial Pulse Ratio: 66 to 33 % Make / Break Ratio (approx.)

Test Points: To observe various signals / voltages to understand the working of Telephone

Switch Faults: 4 Nos.

Interconnections: 2 mm gold plated pins

Accessories: Power cord, Experiment Manual and 2mm patch cords

 

Experiments included:

To study the Working of Polarity Protection Circuit

To study the working of Voltage Dropper / Hook Detection Circuit

To study the working of Ringer Circuit

To study the working of Keypad Circuit

To Study the Working of TONE/PULSE Dialer Section

To Study the Working of Speech Circuit

To study the Telephone Trainer Switched Faults