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9 October, 02:12

Smith, Smith, Smith, and Smith (S4) is a regional accounting firm will be moving to a new four-story building. There will two Local Area Network in each floor. In each LAN, twisted pair cabling have been used to connect the client computers to the local switch. In addition, all eight LANs will be connect to each other via Coaxial Cables. They are very concerned with network errors and how to come up with counter measures. a) List possible network errors sources

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  1. 9 October, 05:56
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    Crosstalk, Jitter, Impulse noise.

    Explanation:

    Crosstalk is a network error that occurs when one pair of cable causes interference on another pair of cables thereby preventing efficient data transmission.

    Jitter may also impair the accuracy of the data being transmitted across network because minute variations in amplitude, phase, and frequency always occur. The generation of a perfect carrier signal in an analog circuit is almost impossible. The signal may be affected by continuous and rapid network gains or phase changes.

    Impulse noise (also referred to as spikes) is the primary source of errors in data communications. Impulse noise can be caused by positioning a communications cable near a source of intermittent but strong electromagnetic pulses, such as an elevator motor.

    Counter measures

    Shielding (protecting wires by covering them with an insulating coating) is one of the best ways to prevent impulse noise, cross-talk.

    Amplifiers can be used to increase signal strength since the connection would run across 4 floors.
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