一向都唔理速度，多數睇網頁，直至最近up down files同時進行，拆牆盒先發現。
cat5 8芯，發現只駁左4芯
...
pbodq 發表於 2019-11-1 08:19 
100M Cat5 永遠都係用4芯 12,36 . Switch 同Lan card都係得12,36 有接綫, 其他綫接左都冇用.
https://en.wikipedia.org/wiki/Fast_Ethernet#100BASE-TX
100BASE-T is any of several Fast Ethernet standards for twisted pair cables, including: 100BASE-TX (100 Mbit/s over two-pair Cat5 or better cable), 100BASE-T4 (100 Mbit/s over four-pair Cat3 or better cable, defunct), 100BASE-T2 (100 Mbit/s over two-pair Cat3 or better cable, also defunct). The segment length for a 100BASE-T cable is limited to 100 metres (328 ft) (the same limit as 10BASE-T and gigabit Ethernet). All are or were standards under IEEE 802.3 (approved 1995). Almost all 100BASE-T installations are 100BASE-TX.
100BASE-TX[edit]
3Com 3C905B-TX 100BASE-TX PCI network interface card
100BASE-TX is the predominant form of Fast Ethernet, and runs over two wire-pairs inside a category 5 or above cable. Each network segment can have a maximum cabling distance of 100 metres (328 ft). One pair is used for each direction, providing full-duplex operation with 100 Mbit/s of throughput in each direction.
Like 10BASE-T, the active pairs in a standard connection are terminated on pins 1, 2, 3 and 6. Since a typical category 5 cable contains 4 pairs, it can support two 100BASE-TX links with a wiring adaptor.[5] Cabling is conventional wired to TIA/EIA-568-B's termination standards, T568A or T568B. This places the active pairs on the orange and green pairs (canonical second and third pairs). |
簡體版
訂閱頻道
訂閱電子報
發表於 2019-11-1 08:19
| 
