What are the length requirements for 1000 base t cabling? I swapped out a 10/100 hub for a 10/100/1000 hub and only a few ports are using
1000 even though all NICs are 10/100/1000.- posted
18 years ago
What are the length requirements for 1000 base t cabling? I swapped out a 10/100 hub for a 10/100/1000 hub and only a few ports are using
1000 even though all NICs are 10/100/1000.
Same as for 100TX--there are some additional tests that should be applied to the cabling but any decent-quality cable that is properly installed that passes CAT5 should pass 5E.
Get yourself a couple of SMC boards or others that are based on the Marvell Yukon chips and run the cable analysis software that comes with them--if there are any glaring problems with the cable that should find them.
100m (328ft), same as 100baseTX.
Are you sure all cabling is good (no split pairs, all 8 conductors properly terminated)? Otherwise, it may be a software issue.
-- RObert
Sorry, I meant the minimum length. They were all tested out on a 100 mbit switch when I cut them ... worked fine there ... figured they would be OK on the 1000 mbit ... apparently not :|
the supported length is the same (100m or 90m fixed + 10m allowance for patching) - as long as your cable is installed properly.
but 1000 Base-T needs all 4 pairs connected correctly, whereas 100 Base-TX only needs 2.
Cut them? Why? How did you reterminate? Punchdown or crimp? Both have pitfalls.
There is _no_ minimum length for 100baseTX. I've used 1 cm loopbacks and 5 cm crossovers successfully at full throughput. AFAIK, the same goes for GBE.
-- Robert
When you switched from 10/100 to 1G and it stopped working (quality of cabling presumably OK, except for wiremap), it normally means your pairs #1 and #4 were terminated badly or not at all. 10/100 equipment can care less about those pairs whereas Gigabit Ethernet needs all four.
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