Telephone Networks & Different Types of Data Transfer Lines

Telephone Networks & Different Types of Data Transfer Lines

Public switched Telephone Network is the worldwide telephone system that manages voice oriented telephone call. Uses digital technology accept the link from company to home that is half an analogue. Used in computers communication cricket data,, and can be transferred over the Telephone Network using dial up lines are dedicated lines.

1. Dial up lines

Dial up line is a temporary connection that uses analogue telephone line for communications. At the sending end is used to dial the number of modem at the receiving end. At the receiving end answer the call. Is established under data can be transferred. There is any problem in any after modems a communication stops. Nine is inexpensive as it cost Alok local call. Used to connect two computers located at any location. the nine app Nine is not very high


2. Dedicated lines

Dedicated line is a connection that is always established between two communication devices. The quality of dedicated line is better than dial-up line. Connect to distant locations. PNB digital or analogue. The speed with which airline carries data and information is called transfer rate. What is expressed as bits per second. Rate is from thousands of bits per second called kilo bits per second to millions of bits per second called megabits per second and variance of bits per second call gigabits per second.

Types of dedicated lines

ISDN lines

These lines provides faster transfer rates then dial up telephone small businesses and home users. Instance for integrated service Digital Network. Set up standards for Digital transmission of data over standard copper telephone lines. Online can carry three or more signals at one time using the same line. Multiplexing. Requires ISDN and modem at both sides. It is different from dial up modem. It also requires special ISDN and telephone line for voice communication. Asian and voice conference becomes clearer.

DSL

It stands for Digital subscriber line. What is the standard copper telephone for fast speed transmission. Special network card of DSL modem is required to connect two DSL. Is yet to install then ISDN and it is also faster.
A type of DSL is known as ADSL which stands for asymmetric digital subscriber line. It provides faster transfer rates when receiving data then sending data. Receiving data is called downstream rate and the rate of sending data is called upstream rates.

Cable television lines
Cable television line is not a type of standard telephone line it is very popular dedicate line used to connect to the internet.

T Carrier Lines

It is one many digital lines that carry multiple signals over a single communication line. Use multiplexing to share the telephone line. Faster transfer seeds. Expensive in on the medium or large companies can afford them. T1 line is the most popular caroline. Connect to the internet backbone.A T1 line kin sport 24 simultaneous Vizag data channels and achieve a maximum throughput of 1.544 mbps. T2 lines are composed of four T1 lines and delivery throughput of 6.3 MBPS. T3 e lines are abound of 28 T1 lines and delivery throughput of 44 mbps. T4 lions contain 168 T1 lines and provide 274 mbps throughput.

ATM

It stands for asynchronous transfer mode basic citizen service to carry voice common data, video multimedia at very high speed. Used by telephone networks, other networks with heavy traffic.