2706A1 Discussion Sheet

2706A1 Discussion Sheet - 2706A1 Discussion Sheet SHORT...

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2706A1 Discussion Sheet SHORT ANSWER 1. ANS: The advantages to using the PSTN are its ubiquity, ease of use, and low cost. A person can travel virtually anywhere in the world and have access to a phone line and, therefore, remote access to a network. However, the PSTN comes with significant disadvantages. Most limiting is its low throughput. Currently, manufacturers of PSTN modems advertise a connection speed of 56 Kbps. But, the 56-Kbps maximum is only a theoretical threshold that assumes that the connection between the initiator and the receiver is pristine. Splitters, fax machines, or other devices that a signal must navigate between the sender and receiver all reduce the actual throughput. The number of central offices, switches, and modems through which your phone call travels also affect throughput. Each time the signal passes through a switch or is converted from analog to digital or digital to analog, it loses a little throughput. In addition, the FCC (Federal Communications Commission), the regulatory agency that sets standards and policy for telecommunications transmission and equipment in the United States, limits the use of PSTN lines to 53 Kbps to reduce the effects of crosstalk. Thus, you will never actually achieve full 56-Kbps throughput using a modem over the PSTN. REF: 352
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This note was uploaded on 03/08/2010 for the course CIE M350 taught by Professor . during the Winter '09 term at World College.

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2706A1 Discussion Sheet - 2706A1 Discussion Sheet SHORT...

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