Lecture 1 - Data Communication Exchanging data over some transmission medium Four important characteristics 1 Delivery of safe and accurate to the

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Data Communication: Exchanging data over some transmission medium. Four important characteristics: 1) Delivery of safe and accurate to the correct destination 2) Timeliness: On time delivery without “jittering”(variation in arrival time) especially for audio and video data. Major components of DC: 1.3 Figure 1.1 Five components of data communication 1) Message : Information to be communicated: text, numbers, pictures, audio, video. 2) End devices : senders and receivers , computers, telephones, T.V., cameras. 3) Transmission medium : Physical links that carries the communicated data, TP, coaxial, fibers, radio waves, etc 4) Protocol for DC: Set of rules that govern DC, syntax and semantics. Data are text, Numbers, Images, Audio, and video.
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1.4 Figure 1.2 Data flow (simplex, half-duplex, and full-duplex) Data flow between communication devices as follows: a) Simplex (one way only). b) Half Duplex (H/D) (Bidirectional on one links). c) Full Duplex (F/D) (Bidirectional on two links). Networks: Set of nodes connected via physical links for the purpose of: 1) Distributing Processing: dividing a large task over a network of computers. 2) Sharing Data vs. centralization: shared access of data-banks (and other resources) among network of computers. 3) Security and robustness: distributed computers approach is for more security and reliability/dependability. Network Criteria: 1) Performance, Transmission and response times’ throughput and delay. 2) Reliability: How often the networks fail.
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This note was uploaded on 08/12/2009 for the course CS 353 taught by Professor Herlywilson during the Spring '09 term at New Mexico Junior College.

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Lecture 1 - Data Communication Exchanging data over some transmission medium Four important characteristics 1 Delivery of safe and accurate to the

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