Re: Cisco uBR905 Cable Access Router - Full Duplex

In article <fd1pd8$o9r$1@xxxxxxxxxxxxxxxxx>,
"B. Wright" <bmwright@xxxxxxxxxxxx> wrote:

Tom Stiller <tomstiller@xxxxxxxxxxx> wrote:
In article <fcvi3h$ea2$1@xxxxxxxxxxxxxxxxx>,
"B. Wright" <bmwright@xxxxxxxxxxxx> wrote:

nordic mist <jeffeb@xxxxxxxxx> wrote:
Hi,

I'm inquiring about the 4 10-Mbit/s ports on the uBR905 model, and
if they support full duplex. Isn't that a function of the IOS, and
not the hardware? Would there be a performance issue if half duplex
was enabled?

No, no, no, and no. If you do force whatever is connected to
the other side of that port to full duplex the performance is going to
suck because it will be getting so many errors due to the mis-match. It
is highly unlikely that your cable provider is given you enough bandwith
to even max out a 10Mbit half duplex port anyway.

Since the UBR905 performs switching functions any, or all, of its LAN
side ports can be full-duplex. As for the WAN side, the cable has a
separate reverse channel and is naturally full duplex.

There can be LAN local traffic that could easily max out a 10/100/1000
full duplex port, regardless of the speed of the WAn side.

It's got a HUB built into it, not a switch and I think you will
be hard pressed to find a 10Mbit hub with full duplex support.

My bad. I was mistaken about the switching capability.

[snip]

--
Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF
.

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