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Posted by geoff on February 2, 2006, 3:53 am
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> No. Electrons travel down copper, and light through fiber at the same
> speed whatever that copper or fiber is connected to. They don't magically
> go faster because they originated or are destined for a cable subscriber.
> Cable networks didn't change the laws of physics.
Then if comparing it to a highway, a modem would be like a highway with 1
lane in each direction whereas a cable modem would be like a highway with 8
lanes in each direction. However, no car is allowed to go over 60 mph.
?
-g
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Posted by Warren on February 2, 2006, 4:23 am
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geoff wrote:
>> No. Electrons travel down copper, and light through fiber at the same
>> speed whatever that copper or fiber is connected to. They don't magically
>> go faster because they originated or are destined for a cable subscriber.
>> Cable networks didn't change the laws of physics.
>
> Then if comparing it to a highway, a modem would be like a highway with 1
> lane in each direction whereas a cable modem would be like a highway with
> 8 lanes in each direction. However, no car is allowed to go over 60 mph.
More or less. But not quite. Different devices, such as modems, hubs,
switches, bridges and routers, are more like toll booths and inspection
stations. The variables include how long it takes for the device to do what
it needs to do, how big of a queuing-up area there is, and how many loads
are being sent to that device.
Cars, trucks, and even mopeds will all travel at the same speed over the
physical medium. Anytime vehicles come to a device whether it is the modem
on your desk or some backbone router there will be a bottleneck. On the
backbone, traffic can be routed around some bottlenecks. (Sometimes this
happens easily and automatically. Sometimes, such as in a network
interchange point with a peering agreement between the networks, it needs to
be done manually, and possibly only after some suit makes a deal.) But the
biggest bottlenecks are usually those closest to each end point, such as the
modem sitting on your desk. Those bottlenecks can't be routed around.
Servers also aren't just pushing as much as they can as soon as you ask for
data. In TCP there are transmission control messages going back to the
source that (in the context of our shipping vehicle analogy) tell the sender
that they can dispatch another load. It can be a problem if your computer is
sending out messages saying that it can handle bigger loads than it really
can. If the queue leading to the bottleneck fills, the drivers get
frustrated, and self-district themselves and their loads.
And to carry the analogy even further, the real data in the loads are in
boxes within boxes within boxes. At some of the stops along the way,
inspection agents have to open some of the outer boxes, and then repack
them. That takes time, too. But whatever vehicle they put the load on as
they send it out, once that vehicle hits the physical medium, be it copper
or fiber, it will travel at the exact same speed as every other vehicle on
that packet.
--
Warren H.
==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Compare and buy TaxCut and TurboTax Software:
http://www.holzemville.com/taxes/
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Posted by Warren on January 30, 2006, 6:38 pm
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> Sometimes, things are dog slow, my provider is earthlink and it goes
> through road runner's network. The ip address is supposed to be dynamic
> but I have left my cable modem off for like a day and when I turn it on, I
> get the same ip address as before.
Yes. That's absolutely normal.
A dynamic IP address simply means that your IP address will only change when
the network has a need to assign you a different IP address. Until then, you
will continue to have the same IP address, even if you turn off your
equipment. But *you* can't count on when that need comes, and when the time
comes, by using DHCP, you don't have to do anything when your IP changes.
> It seems sprintlink is really slow, can anything be down about it? Here
> is the tracert for a server in the usa:
<snipped>
I don't see a problem with what you posted. If you are having a problem,
this doesn't show it.
--
Warren H.
==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Compare and buy TaxCut and TurboTax Software:
http://www.holzemville.com/taxes/
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