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gigabit UTP cable? gigabit UTP cable?
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gigabit UTP cable?
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Old 4th November 2003, 23:45   #11
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indeed - don't mind asking a few meters extra, there's plenty for everyone
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Old 5th November 2003, 13:19   #12
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shorter cable= better.
i'll never need over 20m
ahh what the heck, in a lan it might be usefull to have 40-50m. you never know where the gigabit switch is
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Old 5th November 2003, 13:29   #13
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he means to order more then just 20m, doesn't matter if you cut in three or four pieces. But these cables come in a box , rolled up and accounts for a 300-350m.

see my point?
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Old 5th November 2003, 16:05   #14
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Stupid me, I didn't even bother to check what kind of cable I had. It says "Cat5-enhanced verified for gigabit lan". I guess Cat5 is being replaced with cat5e, because I didn't even notice when I bought it a few months back.

The speed is not that great though: with a 3m crossed cable between 2 IS7's (PCI lan, but nothing else on PCI bus), I get an average of 25% (30MB/sec) transferring data between two sata disks.

Theoretical max:

Maxtor 120GB SATA (50MB/sec sequential read/write) <> 3Com gigabit lan on PCI (125MB/sec) <> 3M cat5-e crossed cable <> 3com gigabit on PCI (125MB/sec) <> 2*SATA 80GB on ICHR-5 raid 0 (75MB/sec sequential read/write)

So why do "only" get 30MB/sec avg?
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Old 5th November 2003, 16:17   #15
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30mb/s is like 3x 100mbit

pretty good in my humble opinion
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Old 5th November 2003, 16:30   #16
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Yeah it's certainly fast, I was just wondering what could be the bottleneck. Judging from benchmarks (giving me an average seq read/write) and the sound of my hard disks, they're not wroking at maximum capacity.
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Old 5th November 2003, 17:01   #17
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HD -> sys bus -> MEM -> CPU -> NETW ----- NETW -> sysbus -> MEM -> CPU -> HD

every step scrapes some Mb's of that ideal theoretical gigabit in my humble opinion


Quote:
from SG:

100mbit ging tegen 10-11mb/sec
1000mbit gaat max tegen 43-45mb/sec
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