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11 Cards in this Set
- Front
- Back
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four
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The wires are organized as _______ pairs.
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two
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Each pair’s _______ wires are twisted around each other several times per inch.
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outer plastic jacket
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there is an _____________ that encloses the
four pairs. |
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RJ-45 connector
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________ is the standard 4-pair UTP connector; plugs into an ________ jack in a host, switch, or wall jack.
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Benefits of 4-pair UTP
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- easy
- inexpensive - rugged |
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Problems of 4-pair UTP
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- Attenuation
- Noise - Propagation Distance - Limit Cord Distance (100 meters) |
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Electromagnetic Interference (EMI)
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reduced by the twisted pair; cancels out over the two halves of a twist (adds on one half and subtracts on second half for net impact of zero)
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cross-talk interference
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EMI between wire pairs in the same bundle - electrons leaves one cable and fly to another; because the pairs are so close, it is strong, but twisting limits it to an acceptable level.
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terminal cross-talk interference
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most important type of EMI; takes place at the
untwisted ends, where twisting provides not protection; LIMIT EXPANDED PART BY 1/2 INCH TO AVOID. |
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Serial Transmission
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the signal is sent on a single pair of wires; one bit is sent per clock cycle.
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Parallel Transmission
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the signal is sent on several pairs; multiple bits are sent per clock cycle; higher speed; faster Ethernet uses this type of transmission
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