Um.. hubs do full duplex. Cat5 (and the like) cabling uses two wires for 1
connection (one for TX and one for RX). Coax cable is only half.
On Fri, 24 Nov 2000, Rick Warner wrote:
>
> This one seems to have a big problem. Not only is it flipping on speed,
> but it has negotiated full duplex. Since a hub cannot do full-dup ....
>
> - rick warner
>
> On Fri, 24 Nov 2000, Jack Bowling wrote:
>
> > Hub that works is a 3Com HomeConnect 10Mbps 5-Port Hub model 3C19260.
> >
> > Now....stick the following hub which is a Linksys Etherfast 10/100
> > Auto-Sensing 5-Port Workgroup Hub model EFAH05W in the circuit (this hub
> > came with two matching Linksys cards as given above) and run the
> > tulip-diag and here is what we get:
> >
> > tulip-diag.c:v2.03 7/31/2000 Donald Becker ([EMAIL PROTECTED])
> > http://www.scyld.com/diag/index.html
> > Index #1: Found a Lite-On PNIC-II adapter at 0x9000.
> > Port selection is 10mpbs-serial, full-duplex.
> > Transmit started, Receive started, full-duplex.
> > The Rx process state is 'Waiting for packets'.
> > The Tx process state is 'Idle'.
> > The transmit threshold is 72.
> > The NWay status register is 000020ce.
> > The current PNIC-II MAC address is 00:a0:cc:36:dd:1d (a000a000
> > 36cc1ddd).
> > The current PNIC-II WOL address is 00:a0:cc:36:dd:1d.
> > Internal autonegotiation state is 'Ability detect'.
> > Use '-a' or '-aa' to show device registers,
> > '-e' to show EEPROM contents, -ee for parsed contents,
> > or '-m' or '-mm' to show MII management registers.
> >
> > Note the NWay register seems to be in a different state, and probably
> > more importantly the autonegotiation is stuck in "Ability Detect" mode
> > instead of "Negotiation Complete". As I write, the Port 2 indicator
> > light on the Linksys hub is cycling between 10 and 100...apparently the
> > hub cannot
> > autonegotiate with its own matching card. One would be tempted to
> > blame the hub rather than the card since the card works fine with the
> > 3Com hub.
> >
>
>
>
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--
-Statux
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