Re: Autonegotiation @ 100 / 1000BASE-T - why in another sublayer of PHY
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Posted by Rick Jones on March 15, 2007, 5:23 pm
Please log in for more thread options > Simple q: W H Y ? ? ?
I'm not sure it is an/the answer, but autoneg in 100BT was (at least initially) optional. I don't think it was ever optional in 1000BT. Perhaps that has something to do with where it is placed? I suspect the folks over in comp.dcom.lans.ethernet would know. rick jones -- Wisdom Teeth are impacted, people are affected by the effects of events. these opinions are mine, all mine; HP might not want them anyway... :) feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... | ||||||||||||||||
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Posted by banan on March 15, 2007, 6:13 pm
Please log in for more thread options > I'm not sure it is an/the answer, but autoneg in 100BT was (at least
> initially) optional. I don't think it was ever optional in 1000BT. > Perhaps that has something to do with where it is placed? I suspect > the folks over in comp.dcom.lans.ethernet would know. Thanks, will go there and check out. bio | ||||||||||||||||
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Posted by glen herrmannsfeldt on March 15, 2007, 8:05 pm
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banan wrote: >>I'm not sure it is an/the answer, but autoneg in 100BT was (at least
>>initially) optional. I don't think it was ever optional in 1000BT. >>Perhaps that has something to do with where it is placed? I suspect >>the folks over in comp.dcom.lans.ethernet would know. > Thanks, will go there and check out.
I don't believe that it existed at the beginning of 100baseTX. I used to have a 3C250 (bought cheap on eBay), one of the original 100baseTX repeaters. No 10baseT mode, but it does make a good door stop. -- glen | ||||||||||||||||
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> of what angle I strike it) - in 100BASE-TX, autonegotiation function
> is placed just before the RJ-45 (MDI), under the PMD (physical
> medium dependent - at the bottom of PHY), and then - in 1000BASE-T
> it is defined as a functional block of PCS (physical coding sublayer
> - at the top of PHY).