9 Aug
2006
9 Aug
'06
9:46 p.m.
On Wed, 9 Aug 2006, CRC wrote:
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.
The MAU is not just an amplifier, there is logic there too. Besides the
two data pairs, there's a third "control circuit" that propagates things
such as link state, collisions, etc. from the MAU to the ethernet card.
Alexey