Cisco uBR905 Cable Access Router - Full Duplex
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Posted by nordic mist on September 20, 2007, 8:03 pm
Please log in for more thread options 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? thanks, Jeff jeffeb@gmail.com | |||||||||||||
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Posted by B. Wright on September 21, 2007, 12:42 am
Please log in for more thread options > 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. | |||||||||||||
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Posted by Tom Stiller on September 21, 2007, 8:12 am
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> > 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. -- Tom Stiller PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF | |||||||||||||
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Posted by Tom Stiller on September 21, 2007, 10:26 pm
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>
> > > > 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 | |||||||||||||
