2012年3月14日 / 173次阅读
Category 3 UTP is rated to carry data up to 10Mbit/s.
Cat 3 UTP was the standard cable used with Ethernet 10Base-T.
Cat 3 2-Pair UTP LAN Cable.只有两股线。
Category 5 UTP is rated to carry Ethernet up to 100Mbit/s and ATM up to 155Mbit/s.
Cat 5 UTP was the standard cable used with Ethernet 100Base-TX.
Category 5e UTP is an enhanced version of Cat 5 UTP.
Cat 5e UTP is rated to carry data up to 1000Mbit/s.
Cat 5e UTP is the standard cable used with Ethernet 1000Base-T.
Cat 5e can also be used to extend the distance of 100Base-TX cable runs up to 350 meters.
Category 6 UTP is very similar to Cat 5 UTP, except that it is designed and manufactured to even stricter standards.
There is a plastic stick inside.
现在有些地方的Ethernet也在使用（DA Office的机房的Patch cable）。
缺点: (1) more expensive; (2) hard to bend; (3) take more space;
Reduce the crosstalk/noises among the copper wires and help to increase the transmission performance.
Category 1 wiring is mainly used to carry voice. The CAT 1 standard was used primarily for telephone wiring prior to the early 1980s. Category 1 is not certified to carry data of any type and, in most cases, is not implemented as a cable type for data-grade wiring.
Category 2 wiring is used to carry data at rates up to 4Mbps. This type of wiring is popular for older token-based networks utilizing the 4Mbps specification of the token-passing protocol. It is rated to 1MHz.
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