
ET
Feb 24, 2003, 12:19 AM
Post #12 of 15
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Re: [Johanson] Plugging in Laptop at Internet Cafes
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....one may connect via cat5e cable.... ....and at the same time, one doesn't have to. A pet peeve of mine (and I have many pets) is the tossing about of technical specifications which don't have any meaning in the context used, such as the referenced "cat5e cable". None of the existing twisted-pair ethernet media systems standards require the use of enhanced Category 5 ("Cat 5e") cabling -- the 10Base-T specifications call for 2 pairs of Category 3 or better cabling, 100Base-T4 runs on four pairs of Cat 3, the 100Base-TX system that everybody thinks of as 100Base-T requires two pairs of Category 5 cable, and 1000Base-T ("Gigabit Ethernet over Copper") requires four pairs of Category 5 or better cabling. Enhanced Category 5 cabling or better is preferred for new network installations because it provides greater flexibility and network options. Use of a Cat 5e patch cable to make the terminal connection between the computer and the work area outlet or other network access point only has meaning, however, if (a) the remainder of the connecting hardware, horizontal cabling, patch cables,and jumpers all meet Cat 5e specifications, (b) channels are kept at or beneath the 100 meter maximum length, and (c) installation is performed in a fashion that will minimize signal attenuation, crosstalk, and stub reflections. What I really think you mean to say is that "one may connect using a twisted-pair ethernet cable", which is sufficient to identify that the "CIA" isn't offering connections via one of the various flavors of fiber optic media systems or coax.
(This post was edited by ET on Feb 24, 2003, 12:22 AM)
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