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Chinatopix via APFrom Wikipedia, the free encyclopedia
A Cat 6 patch cable with
termination
Category 6 cable, commonly referred to as Cat 6, is a standardized
and other network
standards.
Compared with Cat 5 and Cat 5e, Cat 6 features more stringent specifications for
and system noise. The cable standard also specifies performance of up to 250 MHz compared to 100 MHz for Cat 5 and Cat 5e.
Whereas Category 6 cable has a reduced maximum length of 55 meters when used for , Category 6A cable (or Augmented Category 6) is characterized to 500 MHz and has improved
characteristics, allowing 10GBASE-T to be run for the same 100 meter maximum distance as previous .
T568A Wiring
white/green
white/orange
white/blue
white/brown
T568B Wiring
white/orange
white/green
white/blue
white/brown
Cat 6 cable can be identified by the printing on the side of the cable sheath. Cable types, connector types and cabling topologies are defined by .
Cat 6 patch cables are normally terminated in
modular connectors. If Cat 6 rated patch cables, jacks and connectors are not used with Cat 6 wiring, overall performance is degraded and may not meet Cat 6 performance specifications.
Connectors use eit performance is comparable provided both ends of a cable are terminated identically.
The standard for Category 6A is , defined by the
for enhanced performance standards for twisted pair cable systems. It was defined in 2009.[] Category 6A is defined at frequencies up to 500 MHz—twice that of Cat 6.
Category 6A performs at improved specifications, in particular in the area of alien crosstalk as compared to Cat 6 UTP (unshielded twisted pair), which exhibited high alien noise in high frequencies.
The global cabling standard
has been extended by the addition of amendment 2. This amendment defines new specifications for Cat 6A components and Class EA permanent links. These new global Cat 6A/Class EA specifications require a new generation of connecting hardware offering far superior performance compared to the existing products that are based on the American TIA standard.
The most important point is a performance difference between ISO/IEC and EIA/TIA component specifications for the NEXT transmission parameter. At a frequency of 500 MHz, an ISO/IEC Cat 6A connector performs 3 dB better than a Cat 6A connector that conforms with the EIA/TIA specification. 3 dB equals 50 % reduction of near-end crosstal see .
Confusion therefore arises because of the different naming conventions and performance benchmarks laid down by the International ISO/IEC and American TIA/EIA standards, which in turn are different from the regional European standard, EN 50173-1. In broad terms, the ISO standard for Cat 6A is the highest, followed by the European standard, and then the American (1 on 1 matching capability).[]
When used for BASE-T, the maximum allowed length of a Cat 6 cable is up to 100 meters (328 ft). This consists of 90 meters (295 ft) of solid "horizontal" cabling between the patch panel and the wall jack, plus 5 meters (16 ft) of stranded patch cable between each jack and the attached device. For , an unshielded Cat 6 cable should not exceed 55 meters.
Category 6 and 6A cable must be properly installed and terminated to meet specifications. The cable must not be kinked or bent too tightly (the bend radius should be at least four times the outer diameter of the cable). The wire pairs must not be untwisted and the outer jacket must not be stripped back more than 0.5 in (12.7 mm).
Cable shielding may be required in order to improve a Cat 6 cable's performance in high
(EMI) environments. This shielding reduces the corrupting effect of EMI on the cable's data. Shielding is typically maintained from one cable end to the other using a drain wire that runs through the cable alongside the twisted pairs. The shield's electrical connection to the chassis on each end is made through the jacks. The requirement for ground connections at both cable ends creates the possibility that a
may result if one of the networked chassis is at different instantaneous electrical potential with respect to its mate. This undesirable situation may compel currents to flow between chassis through the network cable shield, and these currents may in turn induce detrimental noise in the signal being carried by the cable.
Category 6e is not a standard, and is frequently misused because category 5 followed with 5e as an enhancement on category 5. Soon after the ratification of Cat 6, a number of manufacturers began offering cable labeled as "Category 6e". Their intent was to suggest their offering was an upgrade to the Category 6 standard—presumably naming it after . However, no legitimate Category 6e standard exists, and Cat 6e is not a recognized standard by the .
is an ISO standard, but not a TIA standard. Cat 7 is already in place as a shielded cable solution with non-traditional connectors that are not backward-compatible with category 3 through 6A.
is the next UTP cabling offering to be backward compatible.
Kish, Paul (July 2002).
(PDF). NORDX/CDT, Inc 2013.
(PDF). 090917 nag.ru
. Archived from
on July 10, 2011.
. Archived from
. Next generation Cat. 6A. Tyco Electronics. Archived from
. Next generation Cat. 6A. Tyco Electronics. Archived from
Barnett, D Goth, D McBee, Jim. Cabling: The Complete Guide to Network Wiring, 3rd Edition. .  .
(PDF), archived from
. January 22, 2014. Archived from
on May 25, 2016.
. LANshack.com.
McLaughlin, Patric (). . Cabling Installation and Maintenance. 20 (12).
Wikimedia Commons has media related to .
. The Siemon Company. . Information on cable construction and alien crosstalk mitigation.
Schmidt, John (March–April 2007).
(PDF). BICSI News. 28 (2). Archived from
(PDF) on . Information on
TSB-155 37m versus
55m limitations.
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The owner of this website (www.makeup.com) has banned your access based on your browser's signature (43aa10a08e1a20ae-ua98).完形填空 Mrs Brown had a young cat. And it was the cat’s first winter. One evening it was outside when it began to snow heavily. Mrs Brown 1 everywhere and shouted its name, but she didn’t 2 it. So she 题目和参考答案——精英家教网——
暑假天气热？在家里学北京名师课程，
& 题目详情
　　Mrs Brown had a young cat. And it was the cat’s first winter. One evening it was outside when it began to snow heavily. Mrs Brown
everywhere and shouted its name, but she didn’t
it. So she telephoned the police and said. “I have lost a small black cat. Has
found one?”“No, madam, ”said the policeman
the other end. “But cats are really very strong animals. They
live for days in the snow. and
it melts or somebody finds them, they are quite
　　Mrs Brown felt happier when she heard this. “And,”she said, “our cat is very
talks. ”The policeman was getting very tired. “Well, then, ”he said, “why don’t you put your telephone
10 ? Perhaps she is trying to telephone you now. ”
A．lookedB．looked after
C．looked upD．looked out
A．findB．search
C．look forD．find out
A．some bodyB．nobody
C．anybodyD．everybody
A．inB．at
C．byD．on
A．some timeB．some times
C．sometimeD．sometimes
A．becauseB．until
C．whenD．for
A．not rightB．all right
C．wrongD．all wrong
A．foolishB．happy
C．cleverD．young
A．hardlyB．already
C．neverD．almost
A．upB．down
C．overD．below
答案：A;A;C;B;D;C;B;C;D;B解析：
1．A;2．A;3．C;4．B;5．D;6．C;7．B;8．C;9．D;10．B
练习册系列答案
科目：初中英语
　Mr Reece worked on a farm. He and his wife grew a lot of things and they had some cows. Every day they worked hard
morning till night. One day, Mr Reece
　2　　　his wife,
“Let's go to Portsmouth next Sunday. We can
lunch there and then we can go to the cinema. ”
　His wife was very happy when she 　4
　this, because they always ate a lot, and she didn't
　cooking three times a day.
　They went to Portsmouth by plane and walked about
　an hour. Then, when it was twelve o'clock, they wanted to
　7 　. They looked at four restaurants（饭店）. In front of one restaurant, they
　a notice（公告）. It read,
“Lunch: 12:30 to 2:30, 1.5 pounds.”
　“Well, that's
　,” Mrs Reece said,
“We can eat for two hours for 1.5 pounds here! This is
　　[　　]
　　[　　]
　　[　　]
heard from
　　[　　]
　　[　　]
　　[　　]
take a bus
have lunch
　　[　　]
looked for
　　[　　]
　　[　　]
　　B． the place
　　C． the thing
　　D． the news
　　[　　]
科目：初中英语
完形填空： 阅读下列短文，从所给的四个选项中，选出最佳答案
　Mrs Hill was very much interested in singing．
She had a good voice（嗓子）, but some of her high notes（高音）seemed to sound like an axle（车轴）
　1　　　enough oil．
Mrs Hill knew this very well, and tried her best to
As she didn't want to 　3
　the other
　of the family, she usually went for long walks along the roads outside the city when she had time, and practised her high notes there．　5
　a car or person coming along the road, she stopped and
　until she could
　be heard before she started practising again
　she was a shy（害羞的）woman．
　One afternoon a fast, open car came up 　10
　and so fast that she did not hear it until it was only a few metres
She was singing some of her 　13
　and most difficult notes at the time, and as the car went past her, she saw a
　look come over its driver's face．
The driver put his brakes
（闸）on, and as soon as the car stopped, he jumped out
and began to 　15
　carefully at all his tyres（轮胎）to
　if there was something wrong with
　17 　．Mrs Hill did not dare（敢）to
　him what the
　had really been, so he got back into his car and drove off as puzzled（迷惑不解）as he had been when he
　　1．A．without
　　B．with
　　C．except
　　D．inside
　　[　　]
2．A．prepare
B．produce
C．practise
3．A．wake
B．trouble
C．surprise
4．A．winners
B．students
C．visitors
D．members
5．A．Once
C．At first
D．Sometimes
7．A．watched
B．listened
C．returned
D．clearly
9．A．because
10．A．behind
D．against
11．A．strongly
B．quickly
C．quietly
D．politely
12．A．from
13．A．lowest
B．highest
14．A．serious
B．friendly
C．strange
15．A．push
16．A．think
17．A．them
18．A．ask
19．A．matter
B．accident
20．A．looked
C．started
D．stopped
科目：初中英语
　“Peter 　1　　
　back from the shops,
”said Mrs James.“He
　some new football shoes, but he
　find any good
ones.”“　　
same?” I asked.“He said they showed him different shoes, but he
them.”“What 　6　　
　do about his boots,
then?” I asked. “Well, the shop told
　next week. It's not a big problem because he doesn't need to have them before the new school term. But he　8　
to arrange（安排）his things early. For example, he
　late for
school.”“My daughter is different,” I said.
“I 　10　　
　throw her out when it's time for
　　(1) A．
　　　　C．
　　(2)A．
wanted buying　
　　 like to buy
　　　 C．
had liked to buy　
　　 wanted to buy
　　(3) A．
didn't can　
　　 can't
　　&&& C．
couldn't　　
　　 couldn't to
　　(4) A．
All of are　
　　 Were all they
　　&&& C．
Were they all　　
　　 They all
　　(5) A．
wasn't liking　　　
didn't like　
　　　　&&
hasn't liked　　　
didn't liked
　　(6) A．
Peter will　　
will Peter to
　　&& C．
is Peter going　　　
is Peter going to
him to go　　　
to him go back　　　
　　&& C．
him coming back　　　
he could go back
(8) A．is beginning always　　　
is always beginning　
begins always　　　
always begins
is never coming　　　
is never　
　　&&& C．
has never been　　　
comes never
need　　　
have to　　　
科目：初中英语
　　 　“I hope you won't forget
I have told you
　” said Mrs Smith.“No” said John.
　three oranges, six eggs and a pound of
　He went down the street
　the shop. As he ran, he said to
　,“Three oranges, six eggs and a pound of
meat.”　7　　
　first he　8　
everything
　, he saw two men
　outside a bookshop
　the policemen
　.After that, he stopped to
　some money to a poor man. He met some of
　friends and he played
　them for a
　. When he
　the shop, he
　forgot everything.
　As he walked
　, his face became
　. When he saw his mother, he said,
“I'm sorry, Mother. I've forgotten to buy the meat and the oranges. I have bought six eggs
(1) A．what
　　(2) A．buy
(3) A．have
　　(4) A．at
(5) A．her
C．himself
(6) A．again
　　 and again
　　 by little
　　 soon as
　　 longer
　　(7) A．
　　(8) A．remember
B．remembers
C．remembered
D．remembering
　　(9) A．Before
　　(10) A．fighting
　　 fighting
　　 fight
(11) A．since
　　 front of
(12) A．arrived
C．arrived
(13) A.spend
C．himself
(15) A．and
C．together
(16) A．while
(17) A．reached
　　(18) A．hardly
(19) A．family
(20) A．red
　　 and red
　　 and redder
C．reddest
　　 and reddest
　　 and redder
科目：初中英语
完形填空：
A: Good evening!
A: Mrs. Green, where 　2& you come from?
B: I 　3& America.
A: 　4& American?
B: Yes, I 　5& .
A: Where 　6& ?
B: I work in a middle school. I'm a teacher.
A: What 　7& ?
B: I teach English.
A: 　8& Chinese?
B: A little. Not much!
A: Do you like working in China?
B: Yes, I do. I like it 　9& .
The Chinese people are very friendly.
A: Do you have 　10& children?
B: Yes, I do. I have a son and two daughters.
A: Are they 　11 you in China?
B: Yes, they are.
A: Do they go to school in China?
B: Yes, they do.
A: Are you 　12& in 　13& school?
B: No, we aren't. They go to a different school.
　14& goodness!
(1)& A. Hello　　　&& 　　B. Excuse me
　　& C. How are you　 　　D. Good evening&[　　]
(2) A. are　　　　& 　　 B. is　
&　 C. do　　　　　　　&
D. does 　　　[　　]
(3) A. from　　　　　&&& B. come from
　　&&& C. am come from　　　D. am coming from　　　[　　]
(4)& A. you are　&&& 　　B. Do you an
　 C. Are you　　　&&& D. Are you a 　　　[　　]
(5) A. do　　　　　　&& B. am&　C.
don't　　&&
　　　D. am not 　　　[　　]
(6)& A. do you work 　& 　　B. you work
&& C. are you work　　& 　D. you are working 　　　[　　]
(7)& A. are you teach　　　 B. do you teach
　　&& C. are you teaching　　D. you teach
　　　　　　[　　]
(8)& A. Are you speak　　　B. You speak
&& C. Do you speak　 　　D. You can speak 　　　[　　]
(9)& A. a lot　　　　 　　B. a little
&　C. not at all　　& 　D. very 　　　[　　]
(10)& A. some　　　　&& 　B. any　　&&&
C. a　　　　& 　　　D. one
　　　[　　]
(11)& A. and　　　　　&&& B. or
&　 C. with　　&& 　　　D. to
　　　[　　]
(12)& A. both　　　　　&& B. no
　　C. but　　　　&&& 　D. all　　　[　　]
(13)& A. the same　　　&& B. same
　　C. different　　& 　D. the different 　　　[　　]
(14)& A. Thanks　　　　　 B. Thank
　　C. Thanks you　 　　D. Thank you 　　　[　　]
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&&&& The basenji is a central African hunting dog. It comes from a country called Chad, which is north of the Central African Republic. The basenji was well—known as the &silent dog& because for centuries no basenjis has ever been known to bark . Then at a dog show in London in 1953, a basenji actually barked. &&&& As well as being clever, basenjis are known for their natural courage and are still popular hunting dogs in Africa. But in America people keep them mainly because they are gentle and full of fun. The basenji has an unusual habit, it washes itself all over like a cat. It is a middle—sized dog, 16 or 17 inches high from the shoulder. It weighs about 20 pounds. A basenji's coat is short and silky. It may be brown, white, or gold , or a mixture of these three colours.1.Basenjis were first found&.&& A. in Africa, Europe and America &&&&&&&&& B. in both Africa and America&& C. in central Africa &&&&&&&&&&&&&&&&&&&&& D. in North Africa 2.What made Basenjis so special?&& A. They were funny enough to make people laugh.&& B. One of them barked at a dog show in London.&& C. They were a true friend of man.&& D. They were born quiet dogs.3.In what way are basenjis like cats?&& A. They make gentle sounds instead of barking.&& B. They are fond of people and look like cats.&& C. They clean themselves all over. && D. They have short, silky fur.&
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欢迎来到乐乐题库，查看习题“ The basenji is a central African hunting dog. It comes from a country called Chad, which is north of the Central African Republic. The basenji was well—known as the &silent dog& because for centuries no basenjis has ever been known to bark . Then at a dog show in London in 1953, a basenji actually barked.
As well as being clever, basenjis are known for their natural courage and are still popular hunting dogs in Africa. But in America people keep them mainly because they are gentle and full of fun. The basenji has an unusual habit, it washes itself all over like a cat. It is a middle—sized dog, 16 or 17 inches high from the shoulder. It weighs about 20 pounds. A basenji's coat is short and silky. It may be brown, white, or gold , or a mixture of these three colours.1.Basenjis were first found____. A. in Africa, Europe and America
B. in both Africa and America C. in central Africa
D. in North Africa 2.What made Basenjis so special? A. They were funny enough to make people laugh. B. One of them barked at a dog show in London. C. They were a true friend of man. D. They were born quiet dogs.3.In what way are basenjis like cats? A. They make gentle sounds instead of barking. B. They are fond of people and look like cats. C. They clean themselves all over.
D. They have short, silky fur.”的答案、考点梳理，并查找与习题“ The basenji is a central African hunting dog. It comes from a country called Chad, which is north of the Central African Republic. The basenji was well—known as the &silent dog& because for centuries no basenjis has ever been known to bark . Then at a dog show in London in 1953, a basenji actually barked.
As well as being clever, basenjis are known for their natural courage and are still popular hunting dogs in Africa. But in America people keep them mainly because they are gentle and full of fun. The basenji has an unusual habit, it washes itself all over like a cat. It is a middle—sized dog, 16 or 17 inches high from the shoulder. It weighs about 20 pounds. A basenji's coat is short and silky. It may be brown, white, or gold , or a mixture of these three colours.1.Basenjis were first found____. A. in Africa, Europe and America
B. in both Africa and America C. in central Africa
D. in North Africa 2.What made Basenjis so special? A. They were funny enough to make people laugh. B. One of them barked at a dog show in London. C. They were a true friend of man. D. They were born quiet dogs.3.In what way are basenjis like cats? A. They make gentle sounds instead of barking. B. They are fond of people and look like cats. C. They clean themselves all over.
D. They have short, silky fur.”相似的习题。