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A private network is one that is exclusive to a particular company No other company s data is sent over the private network The advantages are that the data is secure, you can control how the network is used, and you can predict how much bandwidth you have available A public network (or external network) such as the Internet, is a network through
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which many companies data passes Public networks are less secure than private networks, but the advantages are that public networks are less expensive to use and you don t have to maintain the external network yourself Use a public network under the following conditions: M I L You don t care if data occasionally takes longer to reach its destination or if the delay between sites is relatively unpredictable You want the lowest cost network connection possible The data does not need to be secure or you have the ability to make it secure over the public network (Technologies exist that can provide such security, such as virtual private networks or some types of data encryption)
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Use a private network under these conditions: M I I L Data security is of utmost concern You have a large, experienced staff to set up and maintain the public network Cost is unimportant relative to the benefits that the network brings You need full, reliable control over the network s bandwidth use
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UNDERSTANDING WAN CONNECTIONS
Now that you understand some basics of WAN links, the remainder of this chapter provides an overview of different available WAN technologies and offers tips and advice on each type of link
Networking: A Beginner s Guide, Second Edition
Plain Old Telephone Service (POTS)
Plain Old Telephone Service (POTS) is the telephone service everyone knows While not technically qualifying as a WAN connection (at least as most people think of WANs), POTS can still serve to link two or more sites together for certain low-bandwidth needs Although it is among the slowest methods of establishing a network connection, POTS is ubiquitous and easily used throughout the entire world POTS is also generally (but not always!) the least expensive way to connect POTS is carried over one set of twisted-pair wires (in other words, just two wires) In some cases, two sets of twisted-pair wires are used, but only the two main wires are used to carry the telephone signal and ring signals You can use the other two wires for other features, such as backlighting a keypad on a phone or providing a message-waiting light with some PBX systems POTS connections currently use simple RJ-11 telephone jacks, which simply snap into place The maximum theoretical speed of basic analog POTS is 336Kbps Many factors can decrease this speed; chief among them is line quality Telephone lines with static typically do not connect at the top speed of 336Kbps, may lose their connections unexpectedly, may lose data being transmitted, or may pause for excessive periods of time as bursts of static inhibit the ability to transfer data When you are using POTS to establish a network connection, having matched modems at both ends is optimal Matched modems from the same manufacturer more easily negotiate the highest possible data transmission rates and often can support step-down modes, which automatically use a slower speed when line noise unexpectedly becomes a problem POTS carries only analog signals The data sent between systems is converted from digital data to analog data using a modem The word modem is actually an acronym based on the device s function modulator/demodulator At each end of the connection, the sending system s modem modulates the digital data into an analog signal and sends the signal over the telephone line as a series of audible sounds Then, at the receiving end, the modem demodulates the audible analog signal back into digital data for use with the computer
Integrated Services Digital Network (ISDN)
The technology for Integrated Services Digital Network (ISDN), a high-speed digital communications network based on existing telephone services, has been around for over 10 years Because of extensive upgrades required at telephone company central offices (COs), however, ISDN has not become widely available until now, and even now it is usually available only in major metropolitan areas ISDN is available in two basic forms: the Basic Rate Interface (BRI) and the Primary Rate Interface (PRI) The ISDN-BRI connection is made up of three channels Two channels are called bearer channels and carry data at speeds of 64Kbps per channel Bearer channels can also carry voice calls that is, spoken telephone calls (Each bearer channel can carry one voice call at a time) The third channel, called a data channel, carries call setup information and other overhead communications necessary to manage the two bearer channels The data channel carries 16Kbps of data Bearer channels are abbrevi-
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