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UTP和STP线缆

2012年3月14日 / 146次阅读  InfoTech

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关于以太网常用的UTP和STP线缆的一些基本知识,麦新杰以前的学习总结。从CAT3 UTP开始说起。

Cat 3 UTP

Category 3 UTP is rated to carry data up to 10Mbit/s.
Cat 3 UTP was the standard cable used with Ethernet 10Base-T.

cat3_utp,只有2股线的3类UTP

Cat 3 2-Pair UTP LAN Cable.只有两股线。

(还记得在莫愁新寓住的日子吗?

还记得长城宽带吗?入户就是10M的,Cable里面就只有两对线,CAT3 2pairs的。)

Cat 5 UTP

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.

Cat 5e UTP

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.

Cat 6 UTP

Category 6 UTP is very similar to Cat 5 UTP, except that it is designed and manufactured to even stricter standards.

cat6-utp,里面有一根塑料杆子

There is a plastic stick inside.

STP(Shielded Twisted Pair)

stp,外面有一层保护膜

FDDI网络曾今使用;

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;

Why twisted?

Reduce the crosstalk/noises among the copper wires and help to increase the transmission performance.

Category Specifications for TP
The five major categories of TP cable are based on specifications designed by the Electronic Industries Association and the Telecommunications Industries Association (EIA/TIA). Please note that the EIA/TIA used only unshielded twisted pair (UTP) when it defined the standard wiring categories for twisted-pair cables.

Category 1
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
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.

本文链接:http://www.maixj.net/ict/utpstp-cable-3489
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