9 Aug
2006
9 Aug
'06
5:56 p.m.
On d, 9 Aug 2006 23:33:14 +0100 (BST), ard at p850ug1.demon.co.uk (Tony
Duell) wrote:
Mea culpa - I misread and misspoke...
What I understood was that because of the 5VDC power you couldn't
link it to a repeater... What I should have said "Apple branded
*MAUs* work just fine.
However, the port obviously has the signals required to drive an MAU,
but they don't meet the specifications of IEEE 802.3 (IIRC section
7). Besides the power supply, the signals will not drive the
requisite 50 feet that an IEEE 802.3 AUI is required. Apple and 3rd
party all have short (< 30 cm) cables. Perhaps that is why it is
termed AAUI.
CRC
On Tue, 8 Aug
2006 22:59:12 +0100 (BST), ard at p850ug1.demon.co.uk
(Tony Duell) wrote:
Are you telling me that you've linked the 'mini centronics'
connector of
a Mac to an 10baseT hub with nothing more than a cable (that is,
without
an external transceiver module). Becasue I don't believe this will
work.
Of course it's possible to make a 10baseT transceiver that runs on 5V,
and Apple did so. And then made a 10base2 one. That is not the
problem,
unless you want to use a 'normal' trnasceiver, not an Apple AAUI one.
-tony AFAIK the signals on the 'mini
centronics' connector on the Mac are
much
the same as the 'real' AUI interface, with the exception that
there's a
5V power line, not 12V. In which case you can't link it directly to
a 10
base T hub. you need a trasnceriver.
All my Apple branded AAUI with an RJ45 do 10BASET just fine. The
power supply does not set the interface parameters, but the coupling
transformer. I've 100BASET designs running off 3.3 VDC.