Re: A8V Marvel adapter doesn't work with a lot of routers
- From: nospam@xxxxxxxxxx (Paul)
- Date: Tue, 26 Jul 2005 23:10:19 -0400
In article <bd314$42e6ef80$d8ccbf02$15928@xxxxxxxxxxxxx>,
"news.lightship.net" <nojunk_allowed@xxxxxxxxxx> wrote:
> I have an A8V Deluxe's MoBo with the Marvell Yukon Gigabit adapter. This
> works with my Dell TrueMobile 2300 router that has 10/100 ports, however it
> does not work with my Linksys WRTP54G wireless router plugged into the
> 10/100 port, nor my Netgear router, nor another router I have purchase
> recently that has 10/100 ports. Normally I would just keep the Dell router,
> but it is failing and I need a replacement.
>
> I ran the ALASKA virtual cable tester that comes with the driver and it
> says:
>
> Cable Length Status
> 1-2 0m Open
> 3-6 5m Normal
> 4-5 0m Short
> 7-8 0m Short
>
> Figures, the only thing that the messed up NIC works with is a messed up
> Dell router that keeps loosing its settings.
I think with the Virtual Cable Tester, someone pointed out that
the device at the other end of the cable has to be powered down
but still connected, to get a good reading.
For some background on how it works, try this document:
http://marvell.com/products/transceivers/singleport/VCT_White_Paper.pdf
When I had problems, I found one pair was open, when trying to
connect at Gigabit speeds. Unplugging and replugging a number of
times fixed the problem, implying there was some residue on the
pins of the motherboard connector.
For GbE, all four pairs are used. For 10/100BT, only 1-2 and 3-6
pairs are used. A minimal cable for ethernet, only has to connect
via the 1-2 and 3-6 pins on each end, so the status of 4-5 and 7-8
doesn't matter, in order to get 10/100BT to work.
Perhaps your status will change when the device at the other
end is connected via its Ethernet port, but there is no power
on the device.
A8V --X With no cable attached,
should read "zero meters, Open"
A8V --X <-----> With a cable attached,
should read "five meters, Open"
A8V --X <-----> X-- router With a complete connection to router,
should read "five meters, Normal"
HTH,
Paul
.
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