On Sun, 27 Aug 2000, Alan Havlik wrote:
> On the other hand I would of course need an Ethernet board. I understand
> I should at best get either X-Surf or Ariadne II, for both of them support
> full duplex (what the hell is this anyway?) on 10-Base-T connection, and
Full duplex means that data can be transferred in both directions
simultaneously over the same cable. However:
1) It doesn't work with hubs (as opposed to switches).
2) It works in principle with switches, but the inexpensive switches only
enable it by autonegotiation, which typically doesn't exist on 10Mb-only
NICs.
3) No cable or DSL modem I've seen supports full duplex.
Thus, the only cases where you really get to use full duplex with an Amiga
are on a direct computer-to-computer connection or with a fancy switch
that lets you configure the duplex mode. The rest of the time, it should
be disabled, which is the default.
> 10-Base-T is necessary for connecting to T-DSL. Is this basically correct?
> Is there something else I should consider?
Hardware-wise, that's it.
> Last but not the least I'm wondering if this all would realy suffice for
> the promised bandwidh (768 kbit/s down & 128kbit/s up) or is the ethernet
> board going to be the bottleneck limiting the overall download speed?
10BaseT Ethernet is 10Mb/s, which is more than 10x the combined
upstream/downstream bandwidth you mention. Even a full T1 (1.544Mb each
way) would only use about 30% of a 10Mb/s half-duplex Ethernet. That's
probably why the cable/DSL modems don't even bother with a full-duplex
option.
If you want to hook a T3 to your Amiga, you might have trouble keeping up,
though. :-)
Fred Wright
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