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+ +	2.2		+ WAN Technologies
	+ 2.2.1		+ Analog dialup

+ + + + + + +

+ + + When intermittent, low-volume data transfers are needed, modems and + analog dialed telephone lines provide low capacity and dedicated + switched connections. +

+ + + Traditional telephony uses a copper cable, called the local loop, to + connect the telephone handset in the subscriber premises to the public + switched telephone network (PSTN). The signal on the local loop during + a call is a continuously varying electronic signal that is a + translation of the subscriber voice.

+

+ + + The local loop is not suitable for direct transport of binary computer + data, but a modem can send computer data through the voice telephone + network. The modem modulates the binary data into an analog signal at + the source and demodulates the analog signal at the destination to + binary data.

+

+ + The physical characteristics of the local + loop and its connection to the PSTN limit the rate of the signal. The upper limit is + around 33 kbps. The rate can be increased to around 56 kbps if the + signal is coming directly through a digital connection.

+

+ + + For small businesses, this can be adequate for the exchange of sales + figures, prices, routine reports, and email. Using automatic dialup at + night or on weekends for large file transfers and data backup can take + advantage of lower off-peak tariffs (line charges). Tariffs are based + on the distance between the endpoints, time of day, and the duration + of the call.

+

+ + + The advantages of modem and analog lines are simplicity, availability, + and low implementation cost. The disadvantages are the low data rates + and a relatively long connection time. The dedicated circuit provided + by dialup will have little delay or jitter for point-to-point + traffic, but voice or video traffic will not operate adequately at + relatively low bit rates.

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+ + + Interactive Media Activity
+ +
Checkbox: WAN Technologies Analog Dialup
+
Upon completing this activity, the student + will be able to identify the characteristics associated with an + analog dialup circuit.
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+ + Web Links
+ + +
Dialup Technologies
+ + http://www.cisco.com/univercd/cc/ + td/doc/cisintwk/ito_doc/ dialup.htm
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