[TowerTalk] Using Plenum Plenum Cable
jimlux at earthlink.net
Wed Jun 21 19:21:34 EDT 2006
At 04:07 PM 6/21/2006, K8RI on Tower talk wrote:
> > etc., cables. As opposed to 10base-2 which used 50-ohm coax. I
>I wonder why they use the nomenclature base T and base 2?
Drifting afield from antennas here, but..
base -> baseband (as opposed to on a carrier) (10BroadXX was a broadband
channelized spec.. I seem to recall it was intended for Cable TV systems,
but went away in favor of "better" approaches)
10 -> 10 Mbps
10base5 -> Thicknet - original Ethernet cable, roughly 0.5" in diameter
Then there was "thinnet" using RG-58 (which is roughly 0.2" in diameter)
When twisted pair started be used
10baseT -> 10 Mbps on twisted pair, at baseband
10BaseF -> 10 Mbps over fiber
100baseT -> 100 Mbps data rate on TP, etc.
Then you have a huge divergence.. 10GBaseT, 10GbaseCX4, etc.
There's a wikipedia entry that covers all this with historical references.
There's also the IEEE 802.3 website.http://grouper.ieee.org/groups/802/3/
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