NE64 Link problem in 10BT

[Stan]

Hi,

my application is a serial to ethernet bridge. I use a MC9S12NE64 with openTCP stack. I set the internal PHY in 10BT, and on some switches( very few), I do have the following problem: the link goes up and down very fast and I am not able to send any packets. This problem occurs only in 10BT, not in 100BT or in autonegociation mode. One of the failing router is Linksys SD208.
Has anybody ever heard of this problem ?

Thanks for your help.

Best regards,

Stan

[bhirisys]

We have the exact same problem using a Coldfire MCF52233 (integrated Ethernet PHY) with a Linksys SD208 switch. Any help solving this issue would be much appreciated.

[bhirisys]

It appears the Linksys SD208 has incorrect polarity on every pair on every port. This can be corrected by making up a (clearly labeled) special cable with the polarity reversed on each pair. Note this is not a standard crossover cable - it's the polarity of each twisted pair that needs to be corrected.

Only 10BT modes are affected as the polarity doesn't matter for 100BT.

See also this thread:

http://forums.freescale.com/freescale/board/message?board.id=CFCOMM&thread.id=1806