Windows XP Help

Dial up Networking with an Analogue Modem


A Modem is a Modulator/Demodulator. It converts digital signals to analogue signals and sends them to another modem over the telephone. There are two types of Analogue Modems: internal or external. Internal modems are slotted into a PCI slot and external modems are connected to your PC via serial cable.
The advantage of an Internal Modem is that its cheaper and does not require more desk space. An External Modem tends to be faster than an internal one as it will have its own processor to do modulation etc, it also works better with other operating systems such as Linux and can be easily transfered to another PC. Modem speed is rated with a V number. Modern modems are rated for V90 or V92 for 56K downloads, V92 has a faster upload speed.


To call an ISP with a modem you need to install a few Network Protocols. The primary Protocol is TCP/IP which uses the Internet Protocol to talk to servers over the Internet using IP numbers, DNS (Domain Name System) to convert email and web addresses to/from IP addresses and DHCP (Dynamic Host Configuration Protcol) to allocate a dynamic IP address to your PC when you connect to your ISP. Your connection will also use PPP (Point-to-Point Protocol) which allows your PC to talk to your ISP over a Dial Up connection. Sometimes, you could use SLIP (Serial Line Interface Protocol).

Setting up a Dial Up Connection

1. Start, Settings, Network Connections
2. Select 'Create a New Connection'
3. Select 'Connect to the Internet'. Next
4. Select either 'Set up my connection manually' or use 'Use the Cd I got from my ISP' if you received a Cd.
5. If using a CD, click Finish and insert your Cd and run setup from the CD. Otherwise follow these instructions.
6. Select 'Connect using a Dial-up Modem'. Next
7. Enter the name of your ISP e.g Demon, PlusNet, Tesco, etc
8. Enter the phone number you use to connect to your ISP.
9. Enter the user name, password and reenter password to confirm. These are supplied by your ISP or chosen by yourself when you signed up.
10. Make sure all the options are ticked below for allow everyone on your PC to connect (if they all share the same one), to make it your
default connection and enable the Internet Connection Firewall. Next
11. Enable option to create a shortcut of the connection to the desktop to make it easy to start a connectionwhen you want to rather than from the
Start menu.
12. Click Finish

You can change your connection options, by double clicking your Connection icon and select Properties.

Properties of a Dial-Up Connection


Connect using: Specify which modem device you want to use. In most cases, you only have one modem.
Configure: You can specify max speed e.g. 115,200, and whether to use compression, hardware flow control and error control.
You can specify whether the modem speaker is on or not. Helps to diagnose why connections are not being made.
Phone Number: Specify phone number to call your ISP here
Use dialling rules: Use special rules, if your telephone is set up in some special way e.g need to dial a number before hand.
Show icon in notification area: Will display a network icon in system tray when you connect up. Can see status and ip address from here.


Display progress when connecting: Displays some messages when dialing and authenticating to your ISP when you connect.
Prompt for name and password: Displays login box when you try to connect to your ISP. This is usually filled in.
Include Windows logon domain: Enter domain name if required. This is usually turned off.
Prompt for phone number: Displays login box with telephone number to dial with.
Redial attempts: Number of attempts to redial if dialling fails first time. Usually 3 times.
Time between redial attempts: Wait period between a redial. Usually 1 minute.
Idle time before hanging up: Number of minutes if no activity before you are disconnected. Usually 20 mins.
Redial if line is dropped: You can auto redial your connection if it drops with this option.
X25: Special logon for X25 networks. Not usually used.


Security Options:
Typical: Allow unsecured password (default), require secured password, use smart card. Depends on the ISP and server you connect to.
In most cases its unsecure.
Advanced: You can specify which protocols to use i.e.EAP, PAP, SPAP, CHAP, MS-CHAP. Defaults which cover most protocols are
Show terminal window: You can view what is being sent/received via a terminal window during logon. For diagnostic purposes mainly.
Run script: Runs a special script to reply to prompts on the screen for usernames, passwords etc. Only used in special cases.


Type of dial up server I am calling: Can be a PPP (Point to Point Protocol) or SLIP type server.
This connection uses the following items: List of protocols and clients to use, usually, QoS Packet Scheduler and TCP/IP.


Internet Connection Firewall: Use a firewall to protect your computer from hackers and trojans and other unwanted network traffic to get
access to your computer. This firewall does not protect against programs on your computer to access the internet that you don't know of.
Internet Connection Sharing.
Allow other users to connect through this computer's internet connection: Allows you to share your internet connection with other PCs, although this
will reduce bandwidth, the more users are connected.
Establish a dial up connection...: If using ICS then you need to allow other computers to connect up remotely to the internet through your PC.
Allow other users to control...: Allow other users to control or disable your dial up connection.
Settings: Specifies which TCP/IP services other uses can access on your PC, eg FTP, WWW, Ping etc.