The bandwidth of voice channel in telephone set

-In a telephone system, the bandwidth of a voice channel ranges is from 300Hz to 3400Hz. -The bandwidth allocated for a single voice frequency transmission channel is usually 4kHz,including two guard band (0-300Hz) and (3400Hz-4000Hz) to prevent adjacent frequency interference and,allowing a sampling rate of 8kHz to be used as the basic of the pulse code modulation system used for the digital PSTN...

Connectivity of telephone network architecture

connectivity of telephone network architecture           MAIN DISTRIBUTION FRAME (MDF) - main cross connection point between the Outside Plant (OSP) cable pairs and the exchange. - it provides a great flexibility for line testing functions as well as electrical protection. Used for line     terminations.    MAN HOLE - a jointing chamber / breakout point of cables which...

Telephone Set Component in Telephony

TELEPHONE SET COMPONENT •DTMF circuit and keypad • tone ringer circuit • microprocessor unit (MPU) • speech network • line voltage regulator circuit • loop or line interface • on/off hook circuit • speaker and microphone THE BLOCK DIAGRAM OF TELEPHONE ...

TIP and RING

Tip and Ring explanation in Chapter 1 Figure 1: tip and ring in telephony Tip and Ring are telephony slang for the two wires which make up the electrical circuit used for telephone wiring. Tip is the nickname for the electrically positive wire and Ring is the nickname for the electrically negative wire. Differences Between TIP And RING ...

Telephone Set Component(additional note)

Block Diagram Of Telephone Set Telephone Set Component - DTMF circuit and keypad   DTMF (Dual Tone Multi Frequency) as the name suggest uses a combination of two sine wave      tones to represent a key. keypad - Tone ringer circuit    The tone ringer drives a piezoelectric sound element that produces an electronic ring. Ringer Circuit - Microprocessor   The MPU with RAM, control the function...

Telephone Network For Local Exchange(additional note)

Main Distribution Frame ( MDF ) • The Main Distribution Frame is situated at the telephone exchange. • It used to connect the customer ( phone user ) with the main switching system after passing through the cabinet. Cabinet The cabinet's functions • To save the usage of cable and replacing cable would be easier. • To avoid the joint to be opened and this would save cost and time . • To act as a place to perform maintenance...

The Basic Function Of Electronic Telephone

The Basic Function Of Electronic Telephone 1. It requests the use of the telepohone system when the handset is lifted. 2. It indicates thet the system is ready for use by receiving a tone, called dialing tone. 3. It sends the number of the telephone to be called to the system. This number is initiated by the        caller when the number is pressed or the dial is rotated. 4. It indicates the state of the call in progress by receiving tones indicating the status (ringing, busy,    etc). 5. It indicates...

Public Switched Telephone Network

Public Switched Telephone Network - circuit-switched technology which consists of transmission path and nodes, - The PSTN subscriber does not require any specific knowledge – just dial and answer. -The subscriber of PSTN are interconnected only temporary through switches Main Elements Of PSTN: 1.Subscriber Loop 2.Customer Premises Equipment(CPE) 3.Exchange 4.Transport System 5.Signalling System ...