RE: 2838 10/100 Ethernet adapter full duplex mode

["Kirk Goins" <kirkg@xxxxxxxxxxxxxx>]

pat, I can see your point on say a 10Base2 or 10Base5 coax cables. What about 
10 or 100BaseT (cat5)? There are 4 pairs of wires.

__________________________________________________
Kirk Goins
IBM Certified iSeries Technical Solutions Expert
IBM Certified Designing IBM e-Business Solutions
Pacific Information Systems - An IBM Premier Business Partner
503-674-2985           kirkg@pacinfosys.com


-----Original Message-----
From: Pat Barber [mailto:mboceanside@worldnet.att.net]
Sent: Monday, October 07, 2002 7:59 AM
To: midrange-l@midrange.com
Subject: Re: 2838 10/100 Ethernet adapter full duplex mode


I could be wrong on this, but I don't believe that ethernet is
even remotely capable of doing "full duplex".

Ethernet is a "collision technology" and while all these
little buttons and lights might say "full duplex", they
are just kidding you.

"Full Duplex" requires a dedicated line between boxes that
will allow "send & receive" at the same time. I don't believe
you ever have that situation using ethernet...

I am speaking about "full duplex" regarding AS/400's only, not
pc networks or internet connections. In my opinion, you have
to have a full four wire connection to have "full duplex".

I don't believe that can be done with two stands of twisted pair.


This might just be "nit picking" but I see the term "full duplex"
used incorrectly quite often.

Here is a tiny story on the whole deal:

http://www.hardwarecentral.com/hardwarecentral/reviews/1487/2/

Jay Maynard wrote:
>
> My 170 has a 2838 PCI 10/100 Ethernet adapter in it. I've got the line
> defined as DUPLEX(*FULL). When the system is first powered up, the
> full-duplex light on the Ethernet switch comes on, but it turns off during
> IPL. If I ENDTCP, then vary the line off and change the line's description
> with CHGLINETH (well, the menu display that does that) without actually
> changing any parameters, the full duplex light turns back on, and stays on
> after the line is varied active and STRTCP is run. What's going on here? I'm
> running 5.1, now, for those who weren't reading about my trials and
> tribulations with that upgrade.
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