The Contest Problem Book IV: Annual High School by Ralph A. Artino

By Ralph A. Artino

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Digitization brings a cadre of advantages, including improved voice and data transmission quality; better maintenance and troubleshooting capability, and therefore reliability; and dramatic improvements in configuration flexibility. In digital carrier systems, the time-division multiplexer is known as a channel bank; under normal circumstances, it enables either 24 or 30 circuits to share a single, four-wire facility. The 24-channel system is called T-Carrier; the 30-channel system, used in most of the world, is called E-Carrier.

In digital carrier systems, the time-division multiplexer is known as a channel bank; under normal circumstances, it enables either 24 or 30 circuits to share a single, four-wire facility. The 24-channel system is called T-Carrier; the 30-channel system, used in most of the world, is called E-Carrier. Originally designed in 1962 as a way to transport multiple channels of voice over expensive transmission facilities, they soon became useful as data transmission networks as well. That, however, came later.

When the telephone network first began to spread its tentacles across the continent, no switches were available. Initially, subscribers in towns bought individual phones and phone lines to each person they had a need to speak with, resulting in the famous image, shown in Figure 1-11, of metropolitan telephone poles with tier upon tier of cross-pieces, festooned with aerial wire, and its mathematical representation: n(n–1)/2, the total number of circuits that would be required for n people to be able to speak with everyone else in the community.

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