On 13 Jun 2012, at 14:10 , Gert Doering wrote: > Hi, > > On Wed, Jun 13, 2012 at 01:06:51PM +0200, Maarten Carels wrote: >> Used the right crossover cable? I've seen them with only 12/36 crossed and >> 45/78 not connected. You may need the 12/36 crossed 45/78 straight connected >> variety. > > GigE-on-copper works perfectly fine with no crossing at all. Depending > on the transceivers in question, "crossing some pairs and not others" > might actually confuse their logic that determines cable layout.
Long time ago I connected a small cisco switch (2940 or so) to a chassis based access switch (4500 with gig-E blades). It insisted on having the right crosscable (12/36 crossed, 45/78 straight) between them... Usually not crossing works fine, but sometimes... And beware of 100Mb crosscables that cross 12/36 and leave the rest unconnected. --maarten
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