I&C SCI 11 Lecture Notes - Lecture 1: Packet Switching, Bit Rate, Propagation Delay

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Lines and trunks: low capacity and high capacity. Service characteristics: constant transmission rates, bit rates, call duration: measured in minutes, quality, delay. Loss of data over an error that the switch decides to drop packet: delay. Different types of delay such as queuing: blocking probability. The probability that call is blocked because of congestion. Service characteristics: variable bit rate, connection duration in seconds. Performance: throughout such as rates, delay time as measured in seconds and ms, loss as measured in percentage. A simple telephone system consists of two central (a. k. a. end) offices and a single toll office to which each central office is connected by a 1 mhz full-duplex trunk. The average telephone is used to make 4 calls per 8 hour workday. (don"t worry about calls at night. ) Ten percent of the calls are long-distance, i. e. pass through the toll office. Discuss the similarities between the following national transportation networks and a communications network.

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