1000 Base T

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.

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.