What are Dial-Up Modem Connection

A dial-up modem connection provides the least bandwidth of all the connection methods discussed here, but it may be simplest method to use, especially if you are testing the user response of a new Web site and to track initial traffic patterns. You just dial into your ISP and leave the line connected. Your ISP will charge you for its Internet services and a setup fee; but even so, your costs will be relatively minor unless your call is long distance and you leave it connected for a long period of time. If you’re just testing, you’ll be able to gauge your system needs and optimize your Web site’s content. As traffic to your site increases, you can upgrade to faster lines.Now a day Dial-ups are need rarely.

Your web server must use either the PPP (Point-to-Point Protocol) or SLIP (Serial Line Internet Protocol) dial-up protocol to transport IP packets over the telephone link. Most ISP’s support one or both of these protocols. SLIP was the original protocol, but PPP is now more popular.

When you use a SLIP or PPP connection, you are actually transmitting network protocol packets over a telephone link. In fact, your computer sees the serial card as just another network interface card, similar to ethernet or Token Ring NICs. This configuration allows TCP/IP packetrs to traverse the link in the same way they traverse an Ethernet or Token Ring Network. Microsoft calls SLIP and PPP links “Dial-up Networking” which is a very appropriate term.

The equipment you need is a modem and a high-performance serial port. The serial port needs a 16550AFN URT chip in order to keep up with high-speed modems. You can check your serial port by running Microsoft Diagnostics. Type MSD at a DOS prompt, then press the C key to examine the COM port with a 16550 chip ($25-$50).

Next, you need a telephone line that you can use to connect with your ISP on a 24-hour-per-day basis (although this type of permanent connection is optional if you don’t need your system to be online all the time). Once you’ve got these items, you need an ISP account, an IP address for your server, and a domain name, all discussed later in this chapter.

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