係咪cat6線太長會上唔到Gigabit Lan?

Router : Dlink 655
OnBoard Lan : 內建Realtek 8111C晶片(10/100/1000 Mbit)
入牆果d: AMP Cat6線
唔入牆果d: Buffalo又Flat cat6線, Bafo Flat cat線


測試1: 直插router -- 上到 1Gbps Lan

測試2: 去大約20呎距離router的一間房-- 上到 1Gbps Lan

測試3:  去大約60呎距離router的一間房 -- 只上到 100Mbps Lan

請問....何解? 係咪Cat6線唔可以超過50呎 ?!?!?!


另外, 我router旁宜插有部NAS Synology 211J
我上到 1Gbps的, 抄file果去, 平均只有25 - 28 MBps ...
上100Mbps的...只有12MBps.....

我lan card同Nas都已set了jumbo-frame 7K ......

請問速度上可以改進一下嗎?
1Gbps...理論上有125MBps....我當打個半價...都有60MBps ....
何解.....

上100Mbps的...只有12MBps.....

100Mbps = 12.5MB/s 正常

其它:
1.你肯唔肯定條Cat6線真係Cat6線黎既先?
2.你肯唔肯定部NAS係support 1Gbps?
3.試下換條唔係flat既cable

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Gigabit throughput is around 99 MBytes/s (see http://sd.wareonearth.com/~phil/net/overhead/

Also, your HDD or CPU will drag the transfer speed. What is your HDD read/write speed? Most of the time the bottleneck will be on NAS in your case. You can get a reference on http://www.smallnetbuilder.com/nas/nas-charts/view, DS211 score around 52MB/s.

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樓主,係唔係你個LAN頭有其中一兩條芯無料到啊?
建議你搵個CABLE TESTER 去CHECK下係唔係8條芯都夾齊,又或者條CAT 6裡面斷咗一兩條芯都唔定~

唔埋係CAT 6定CAT 5E只要夾齊8 條芯都可以上到GIGA,兩者嘅最距離都係100米,不過只有CAT 6先可以係果100米內行到GIGA,CAT 5E就CHECK到係GIGA但速度就去唔到GIGA~

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Router : Dlink 655
OnBoard Lan : 內建Realtek 8111C晶片(10/100/1000 Mbit)
入牆果d: AMP Cat6線
唔入牆 ...
enriga 發表於 2011-9-14 11:05



    LAN to LAN 理論去到125MB/s, 實際要視乎你部機個lan, router & nas個lan 仲有 cable既長度

你隻router support jumbo-frame嗎?

211j應該沒咁慢...試過有50MB/s up/down, 不過是 PC - Giga Switch - NAS (沒開jumbo)

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回復 1# enriga


Maximum length
When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 6 cable is 100 meters (330 ft). This consists of 90 meters (300 ft) of solid "horizontal" cabling between the patch panel and the wall jack, plus 10 meters (33 ft) of stranded patch cable between each jack and the attached device. Since stranded cable has higher attenuation than solid cable, exceeding 10 metres of patch cabling will reduce the permissible length of horizontal cable.
http://en.wikipedia.org/wiki/Category_6_cable

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我30 定50M Cat6 Bafo 扁線 , 211j - e4200 - se2500 - imac 都有50mb/s upload / download
e4200 無 jumbo 的, 所以無開到 jumbo

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我30 定50M Cat6 Bafo 扁線 , 211j - e4200 - se2500 - imac 都有50mb/s upload / download
e4200 無 jumb ...
wongja 發表於 2011-9-14 11:39

扁線一定唔係Cat6...
真係要做到好好先有Cat5e
20~30米以上扁線基本上死硬
你個20呎router就算router話上到
真正用都好難上到...

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扁線一定唔係Cat6...
真係要做到好好先有Cat5e
20~30米以上扁線基本上死硬
tuyylihk 發表於 2011-9-14 11:45



    包裝都係寫cat6
而事實又真係行到 Giga
所以我無理到喇
我唔行扁線我捐唔到條線入房, 一係石屎牆鑽個窿
就算鑽個窿都要行30~50m 線先得

anyway 我對條線好滿意
太細緻既野我就無理喇

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包裝都係寫cat6
而事實又真係行到 Giga
所以我無理到喇
我唔行扁線我捐唔到條線入房, 一係石屎牆鑽 ...
wongja 發表於 2011-9-14 11:48

咁你如果要求大約只係500M問題都唔大既
但要上Giga既就肯定唔得啦

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