Technical Specifications

Training Syllabus

• Public Exchange working: – Signaling way out – Generation of signaling
• Signaling generated by the public exchange: – Power supply: Exchange battery, Chokes and feed resistors – Calling
• Telephone signaling systems: – Combinatory disk – Decade keyboard (PULSE) – Dual Tone Multi-frequency signaling (DTMF)
• Telephone operation with pulse and multi-frequency selection: – Calling circuits (Buzzer) – Selection circuits (Dialing) – Phone circuits (Speech)
• Reception and decoding of DTMF signals through active filters.
• Use of custom integrated circuits
• Establishment of a call and line circuit connections
• Connecting phones in derivation
• Troubleshooting

Specifications

Indicators
- LED indication provided for LINE IN, HOOK, TONE and RINGER.

Dialer & Speech
- Tone and Pulse Dialers are provided – Fully Non-Blocking Speech Path
- ToneFrequencyisof430Hz.

Port Connector
- One DOT line connection Port

– One Handset connection Port

Keyboard
- 4x3MatrixKeyboard
- Dialer Keypad contains 0-9, #  &  *

On board Features

• –  Mute, Redial, Flash and On/Off Hook 
switches.
• –  FacilitytoRedialupto32digits.
• –  Dialer and Ringer section.
• –  Ringer Volume control Provided using 
Potentiometer
• –  Pulse dialing as well as Tone dialing 
facility provided thru switch.
• – Fully Non-Blocking Speed Patch
• – DialPulse-Ratiois10pps+/-10%
• – Four Switch Faults are provided.
- Block Description Screen printed on glassy epoxy PCB.
• Power Supply
- Input Power is obtained from Telephone lines.
• Test points are provided to analyze signals at various points.
• All ICS are mounted on IC Sockets.
• Bare board Tested Glass Epoxy SMOBC PCB is used.
• Power is taken from the external telephone line, no separate power supply required.
• User’s Manual is provided.