On Mon, 3 Aug 2015 00:34:50 +0100, tony sayer
wrote:

In article , Java Jive
scribeth thus

There is a difference in cables that can carry Gigabit Ethernet
(10/100/1000Mbps) as opposed to just Fast Ethernet (10/100Mbps) in
that IIRC Gigabit Ethernet requires an extra twisted pair. Thus you
find that if you use a Fast Ethernet cable to connect two Gigabit
ports, the connection will only be Fast Ethernet.

You sure about that?. I thought its down to the number of pairs used in
the cable, normally Green and Orange but plus the Brown and Blue in Gig
working....

Isn't that what I said, only you've given more detail?

As far as any other hype is concerned, ethernet connections either
work or they don't,

Not quite that simple, length plays a large part in thruput...

though it should be remembered that if a faulty
connection causes a high error rate, then a proportion of the data
sent across it will be corrupted and will have to be resent, and
therefore the net data rate across the connection will be reduced.

Well again, an overly-long connection would tend to behave as I
described for a flakey connection, so IMV that's six of one and
half-a-dozen of the other.
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On 03/08/2015 01:17, Java Jive wrote:
On Mon, 3 Aug 2015 00:34:50 +0100, tony
wrote:

In , Java Jive
scribeth thus

There is a difference in cables that can carry Gigabit Ethernet
(10/100/1000Mbps) as opposed to just Fast Ethernet (10/100Mbps) in
that IIRC Gigabit Ethernet requires an extra twisted pair. Thus you
find that if you use a Fast Ethernet cable to connect two Gigabit
ports, the connection will only be Fast Ethernet.

You sure about that?. I thought its down to the number of pairs used in
the cable, normally Green and Orange but plus the Brown and Blue in Gig
working....
Isn't that what I said, only you've given more detail?


It's _two_ extra pairs.

Andy

I was going to retort: "But one in each direction, surely?" as I was
considering data moving in one direction, from server to playback
machine as in the original article I was commenting on, but, in fact,
a search seems to suggest from the wiring names that the pairs in
Gigabit cables are all bi-directional, which I didn't realise before.
For example (diagram entitled 'Ethernet Connector Pin Assignment'):
http://www.bnoack.com/index.html?htt...bles/CAT5.html

On Mon, 3 Aug 2015 21:47:25 +0100, Vir Campestris
wrote:

It's _two_ extra pairs.
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