Dial-up services are an inexpensive, slow way to access the Internet. A modem is required to dial an access number provided by the Internet Service Provider (ISP). In this type of connection, both sides must have a modem. The user computer is known as the client, and the service provider?s end is referred to as the remote server.

The best point about dial up service is that it requires no other infrastructure except a phone line. It is very easy to find a telephone line anywhere. So people who are always on the move, find it very easy to get connected through dial up.

The biggest draw back of dial up is that it requires too much time to connect. After the phone line is connected to the modem, the modem sends the username and password to the remote server asking for permission to log on to the Internet. This is called as a handshake. The server then verifies the information and grants access. This takes a significant amount of time that naturally adds to the cost.

Line noise and low speeds are also some of the drawbacks. The maximum capacity of a dial up connection is typically 56kbps (kilo bytes per second). The actual delivered speed can be even less than 56kbps.

Many ISPs that provide high-speed dial up use acceleration servers with compression technology, client-side caching and filtering to reduce the time required to search information. This reduces the time used for handshake by almost 30 percent and makes connection and re-connection faster. This goes a long way in saving call charges and time required to complete work online.

Dial up service still remains a service of choice, where faster Internet options like broadband, DSL or cable are not available. It is still the most readily available and one of the most used services across the globe.

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