http___www.tekbar.net_hr_network-construction_integrated-wiring-systems-on-the-network-to.html_1.xml
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About network cabling system is still relatively common, so I've done some research network cabling system is easy to be neglected, and some on the test and demand issues out here and share with you, we want to be useful. Imagine, the trolley cars on the Advanced tire, 1.2GHzP4 the computer uses 16M of memory, obviously this is a wrong way to save money. As computer memory to consider whether to match the same CPU speed, network cabling systems integrators and end users should carefully evaluate whether the matching network cabling system. For example, choose the best cabling system, the worst jumper. The question now should cause the jumper's weight. Network Cabling System of noteworthy new role Network cabling system is usually installed first in the installation of furniture and equipment, at the moment about 95% of the wiring system have been testing the permanent link model. Permanent link test does not include the equipment at both ends of the jumper. After testing the permanent link through the transmission performance can be guaranteed, if coupled with the network cabling system that matches qualified jumper, then the network will work well. Unfortunately, this is not always the case. Most wiring are aware of the April 2001 issued a TIA568B standard. The standards include five lines over the wiring requirements. But few know why the standard of completion took so long. One of the important reasons is that the jumper performance unstable and difficult to grasp. Return loss of the jumpers in the testing standards were enacted, the United States Fluke Networks jumper on the same two cases in the following measurements, obtained different results. There is no knot on the jumper, is bent or do a bad deal, or even just make a simple transposition place (the user is also frequently change the jumper to connect the computer), the test results surprising. Figure B and Figure A compared to the situation, the return loss better than 4dB. This 4dB difference enough to affect the entire channel can test whether the standard. During the TSB-67 standard, which is a common problem, however, since then, no need to test return loss. Therefore, the test on the jumper did not pay attention to. The 568B standard return loss parameters of the jumper with strict rules, which raises the importance of the jumper. The most vulnerable link link If you pay attention to structured cabling in the entire channel, from the PC to the switch, the most vulnerable part of the connectors link, link location is often where the worst performance. Why? Because the twisted-pair twisted-pair structure was destroyed and was squeezed in a small space between lines of the cross or cross-connected to each other, in parallel into the joint, by crimping tools, fixed also the wire damage the metal structure, leading to changes in impedance, return loss effects. Jumper is often free to use, such as tables and chairs between the winding, or drag heavy compression strength, etc. After several such use, can they hope to achieve the original performance of the jumper, it is almost is not possible. Jumper is in the structured cabling and the most frequently touched parts of change, they send the signal energy in the strongest position and received signal energy weakest position. Small impedance change will bring 3-4% of the reflection, link to link the end of the middle of the transmission signal reflection is one of the factors causing major damage. At the same time will affect the near-end crosstalk. End-users to consider not only the performance of permanent links, should also consider channel performance. Manufacturers hope that the wiring system has cabling networking equipment longer than the life cycle of Web applications to meet the bandwidth requirements, now jumper line 10/100BASE-T Ethernet connection request can be, but the use of four pairs of lines on the Gigabit Ethernet full-duplex transmission, the jumper's performance will have a decisive impact. Bandwidth demand Of the six types of cabling will have some special requirements. Six lines of performance is better than five lines or over five lines, especially in the near-end crosstalk and return loss of respect. Plugs and sockets must be a perfect match. So now to make a variety of plugs and sockets are compatible and match for a lot of research, developed a number of different specifications to make them as small as possible. But until now, regardless of how to improve manufacturing processes and technologies, six-line system also only allows the use of vendor-specific as well as a certified or licensed jumper, can not guarantee and matching network integrated wiring system and achieve the performance of the entire channel. The jumper's such a stringent requirement, the end user do? How can we ensure that it has qualified jumper? Clearly need a proven method, only the line sequence of the test is not enough.在测试中有足够余量的永久链路和临界状态的跳线是勉强可以通过通道测试的.但是这种临界状态的跳线和临界状态的永久链路一起使用,通道测试就可能失败.除了持续不断的测试外,还应该对跳线的每一对线的近端串扰和回波损损耗进行测试,这些测试应该按照TIA的跳线测试标准进行. (这种测试带有特制的装置,不是简单的通道测试!).这就意味着这些跳线必须和固定部分相匹配才可使用.否则,即使测试通过,也不能说明什么问题. 跳线存在重复使用的问题,通过不断缠绕后,如何保持其性能的完好?多年以来,美国福禄克网络公司为了制造和厂商相匹配的测试适配器,而从不同厂商购进了各种各样的跳线,这些跳线可以保证100%的与这些公司的产品兼容,比一般跳线的性能要优越.这些跳线的线序是否正确?肯定.这些跳线在10/100M应用中是否良好?是的.但是经过多次的反覆缠绕,反覆卷曲和拉直,其性能能否达到千兆网的要求?多数是无法达到指标的. 成功的测试 最终用户确实需要一个好的工具来测试跳线.首先你要听从电缆厂商的意见,选择有质量保证的跳线.在多数情况下,这是一种简单的避免潜在问题的方法,特别是在六类布线系统中. 另外一个选择是自己来测试跳线,这样的现场测试仪已经出现.美国福禄克网络公司的DSP-4000系列现场电缆认证测试仪加上跳线测试适配器选件就可以完成跳线的测试.跳线测试适配器在硬件和软件上都非常精确,完全符合TIA的跳线测试标准.事实上,这些产品已经在在全球的许多电缆或跳线生产厂商所使用,这也是一套检查以前的跳线质量的方法. 不要忽略你的跳线,它已经是网络的重要组成部分,如果多花一些时间测试它,确保质量,你就会发现将获得更低的数据错误率,更大的吞吐量,更大的布线系统的余量以及更少的网络故障.
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O mrežnim kablovima sustav još uvijek je relativno česta, tako da sam učinio neki istraživanje mrežni sustav kabliranja je lako biti zanemareni, a neke na test i potražnje pitanja ovdje i podijeliti s vama, želimo biti korisni. Zamislite, trola automobila na Advanced gume, 1.2GHzP4 računalo koristi 16M memorije, očito je to pogrešan način za uštedjeti novac. Kao i razmotriti da li memoriji računala da odgovara isti CPU brzina, mrežni sustavi kabliranja integratorima i krajnji korisnici bi trebali pažljivo ocjenjuju da li prilagodna mreža kabliranje sustava. Na primjer, odabrati najbolje kabliranje sustava, najgori skakač. Pitanje je sad bi trebala uzrokovati skakač težinu. Mreža kabliranje Sustav vrijedan spomena nove uloge Mreža kabliranje sustava obično je instaliran prvi u ugradnju namještaja i opreme, u ovom trenutku oko 95% od ožičenja sustava je testiranje stalni link modelu. Permanent link test ne uključuje opremu na oba kraja skakač. Nakon testiranja stalni link kroz prijenos performanse može jamčiti, ako se udruže s mrežom kabliranje sustava koji odgovara kvalificiranih jumper, onda mreža će raditi dobro. Nažalost, to nije uvijek slučaj. Većina ožičenje su svjesni travnja 2001 izdane TIA568B standard. Standardi uključuju pet linija preko ožičenja zahtjevima. Ali malo tko zna zašto popunjavanje standardnog troška tako dugo vremena. Jedan od važnih razloga je da skakač performanse nestabilna i teško dokučiti. Povratak gubitak jumpera u ispitivanju su standardi doneseni, Sjedinjene Američke Države Fluke Networks jumper na istoj dva slučaja u sljedećim mjerenja, dobiveni različite rezultate. Nema čvor na kratkospojnik, savijen je ili napraviti loš posao, ili čak samo napraviti jednostavnu transpoziciju mjesto (korisnik je također često mijenjaju skakač za povezivanje računala), rezultati ispitivanja iznenađujući. Slika B i slika u usporedbi sa situacijom, povratak gubitak bolje od 4dB. Ova razlika 4dB dovoljno da utječe na cijelu kanala mogu testirati da li je standard. Tijekom TSB-67 standardu, to je čest problem, ali od tada nema potrebe testirati vratiti gubitak. Dakle, test na jumper nije obratite pozornost. 568B standardu povratka gubitak parametri kratkospojnik sa strogim pravilima, koja podiže važnost skakač. Najugroženije link link Ukoliko obratite pozornost na strukturno kabliranje u cijelom kanalu, s osobnog računala na switch, najranjiviji dio konektora povezati, povezati položaj, gdje je često najgore performanse. Zašto Jer upleteni dvožilni upleteni dvožilni struktura je uništena i bila je stisnuti u malom prostoru između redaka cross ili cross-međusobno povezani, paralelno u zglob, prema crimping alata, fiksne i žice štete metalne konstrukcije, što dovodi do promjene u impedancija, vrati gubitak efekata. Jumper je često besplatan za korištenje, kao što su stolovi i stolice između namota, ili povucite teške tlačna čvrstoća, itd. Nakon nekoliko takvih uporabu, može se nadaju postići originalne izvedbe kratkospojnik, što je gotovo nije moguće. Skakač u strukturno kabliranje od najčešće dotače i promijeniti neke svoje energije u slanju najjači signal lokaciju i primljeni signal energiju najslabija pozicija. Male promjene impedancije će donijeti 3-4% refleksije, link na link na kraju usred prijenosa signala odraz je jedan od faktora uzrokuju veća oštećenja. U isto vrijeme će utjecati na kraj-kraj preslušavanja. Kraj-korisnik za uzeti u obzir ne samo izvedbu trajne veze, treba razmotriti i kanala performanse. Kablovske nadu da sustav žica je duže od životnog vijeka mrežne opreme u susret zahtjevima propusnost mrežne aplikacije, a sada spojiti jumper može zadovoljiti zahtjeve 10/100BASE-T Ethernet, ali korištenje četiri para vodova na Gigabit Ethernet full-duplex prijenos, kratkospojnik nastup će imati odlučujući utjecaj. Bandwidth potražnje Od šest vrsta kabliranja će imati neke posebne uvjete. Šest linija performansi je bolji nego pet linija ili preko pet redaka, osobito u spoju preslušavanja i povratak gubitak poštovanja. Utikači i utičnice moraju biti savršeno odgovaraju. Tako sada napraviti različite utikači i utičnice su kompatibilni i utakmicu za mnogo istraživanja, razvila niz različitih specifikacija učiniti ih kao mali kao mogući. No, do sada, bez obzira na to kako poboljšati proizvodne procese i tehnologije, šest-line sustav također jedini dopustiti korištenje prodavatelja specifičnih, kao i ovjerene i licencirane jumper, ne može garantirati i prilagodna mreža integrirani sustav žica i postići učinkovitost na cijeli kanal. 对于跳线的如此严格的要求,最终用户能做什么呢?怎样才能保证拥有合格的跳线呢?显然需要一种证明的方法,只有线序的测试是远远不够.在测试中有足够余量的永久链路和临界状态的跳线是勉强可以通过通道测试的.但是这种临界状态的跳线和临界状态的永久链路一起使用,通道测试就可能失败.除了持续不断的测试外,还应该对跳线的每一对线的近端串扰和回波损损耗进行测试,这些测试应该按照TIA的跳线测试标准进行.(这种测试带有特制的装置,不是简单的通道测试!).这就意味着这些跳线必须和固定部分相匹配才可使用.否则,即使测试通过,也不能说明什么问题. 跳线存在重复使用的问题,通过不断缠绕后,如何保持其性能的完好?多年以来,美国福禄克网络公司为了制造和厂商相匹配的测试适配器,而从不同厂商购进了各种各样的跳线,这些跳线可以保证100%的与这些公司的产品兼容,比一般跳线的性能要优越.这些跳线的线序是否正确?肯定.这些跳线在10/100M应用中是否良好?是的.但是经过多次的反覆缠绕,反覆卷曲和拉直,其性能能否达到千兆网的要求?多数是无法达到指标的. 成功的测试 最终用户确实需要一个好的工具来测试跳线.首先你要听从电缆厂商的意见,选择有质量保证的跳线.在多数情况下,这是一种简单的避免潜在问题的方法,特别是在六类布线系统中. 另外一个选择是自己来测试跳线,这样的现场测试仪已经出现.美国福禄克网络公司的DSP-4000系列现场电缆认证测试仪加上跳线测试适配器选件就可以完成跳线的测试.跳线测试适配器在硬件和软件上都非常精确,完全符合TIA的跳线测试标准.事实上,这些产品已经在在全球的许多电缆或跳线生产厂商所使用,这也是一套检查以前的跳线质量的方法. 不要忽略你的跳线,它已经是网络的重要组成部分,如果多花一些时间测试它,确保质量,你就会发现将获得更低的数据错误率,更大的吞吐量,更大的布线系统的余量以及更少的网络故障.