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"Mark Lloyd" <mlloyd@5xxxmail.com5xxx> wrote in message
news:mi4ct0lcv3mj0ra2obmiq38g2mlj1feia1@4ax.com...
> On Sat, 01 Jan 2005 01:54:22 GMT, "Joseph Wind" <jpg@gif.com> wrote:
>
> >"Mark Lloyd" <mlloyd@5xxxmail.com5xxx> wrote in message
> >news:tq4bt09f8l9r4v38q5sand83l53n2e340i@4ax.com...
> >> On Fri, 31 Dec 2004 17:13:21 GMT, "Joseph Wind" <jpg@gif.com> wrote:
> >>
> >> My first network was 10Mbit. It worked fine with one of the cables
> >> wired incorrectly (pins 3&6 were connected to the same pins on each
> >> end, but were not in the same pair). 100Mbit refused to work on this
> >> cable. It needed the cable to be fixed, to put 3&6 in the same pair.
> >>
> >
> >10Mbit only needs two wires to work.
>
> That would be 2 pairs.
>
Not exactly, two conductors, take coax for example. I was refering to
10Base2.
> > The reason your 3&6 did not work was
> >because they were not on the same twisted pair.
>
> True. Of course they DID work with 10Mbit.
>
Let me refraze that, it did not work for 100Mbit, but 10Mbit does not
require twisted pairs, it's also very forgiving.
> > The same color should be on
> >the same pin. 1/2, 3/6, 4/5, and 7/8 are each a twisted pair needed for
> >Ethernet.
>
> Only the first 2 pairs are needed for most forms of ethernet. I heard
> about one that needed all 4 pairs once, but it's not in common use.
>
True. The other pairs are used as redundant pairs. If that were the case we
would not need CAT5 cabling, CAT3 would suffice.
> > 10Mbit has a range of 1000ft, while 100Mbit has a range of half
> >of that.
> >
>
> How are you determining the range, and what effect do switches have on
> that?
>
> The information I have (which is for 10Mbit) says a cable can be 100
> meters (about 325 feet), and up to 5 segments can be used. That makes
> the range 1625 feet (maximum between any 2 machines).
>
10Base2 - Max segment length: 200 meters (656'). Max: 5 segments and (1000
meters, 3280') with repeaters/switches, I was sort of right, it was Meters,
not Feet.
10Base5 - Max segment length: 500 meters (1640'). Max: 5 segments and (2500
meters, 8200') with repeaters/switches.
In my FLUKE seminar on Cable anylizers, they said it could go a lot farther
than that depending one the quality of the cable. In many cases the wires
had to be certified, to go past the half the max segment. For real world
number those were pretty safe.
In 10Base-T: CAT3 was bare minimum.
"Mark Lloyd" <mlloyd@5xxxmail.com5xxx> wrote in message
news:mi4ct0lcv3mj0ra2obmiq38g2mlj1feia1@4ax.com...
> On Sat, 01 Jan 2005 01:54:22 GMT, "Joseph Wind" <jpg@gif.com> wrote:
>
> >"Mark Lloyd" <mlloyd@5xxxmail.com5xxx> wrote in message
> >news:tq4bt09f8l9r4v38q5sand83l53n2e340i@4ax.com...
> >> On Fri, 31 Dec 2004 17:13:21 GMT, "Joseph Wind" <jpg@gif.com> wrote:
> >>
> >> My first network was 10Mbit. It worked fine with one of the cables
> >> wired incorrectly (pins 3&6 were connected to the same pins on each
> >> end, but were not in the same pair). 100Mbit refused to work on this
> >> cable. It needed the cable to be fixed, to put 3&6 in the same pair.
> >>
> >
> >10Mbit only needs two wires to work.
>
> That would be 2 pairs.
>
Not exactly, two conductors, take coax for example. I was refering to
10Base2.
> > The reason your 3&6 did not work was
> >because they were not on the same twisted pair.
>
> True. Of course they DID work with 10Mbit.
>
Let me refraze that, it did not work for 100Mbit, but 10Mbit does not
require twisted pairs, it's also very forgiving.
> > The same color should be on
> >the same pin. 1/2, 3/6, 4/5, and 7/8 are each a twisted pair needed for
> >Ethernet.
>
> Only the first 2 pairs are needed for most forms of ethernet. I heard
> about one that needed all 4 pairs once, but it's not in common use.
>
True. The other pairs are used as redundant pairs. If that were the case we
would not need CAT5 cabling, CAT3 would suffice.
> > 10Mbit has a range of 1000ft, while 100Mbit has a range of half
> >of that.
> >
>
> How are you determining the range, and what effect do switches have on
> that?
>
> The information I have (which is for 10Mbit) says a cable can be 100
> meters (about 325 feet), and up to 5 segments can be used. That makes
> the range 1625 feet (maximum between any 2 machines).
>
10Base2 - Max segment length: 200 meters (656'). Max: 5 segments and (1000
meters, 3280') with repeaters/switches, I was sort of right, it was Meters,
not Feet.
10Base5 - Max segment length: 500 meters (1640'). Max: 5 segments and (2500
meters, 8200') with repeaters/switches.
In my FLUKE seminar on Cable anylizers, they said it could go a lot farther
than that depending one the quality of the cable. In many cases the wires
had to be certified, to go past the half the max segment. For real world
number those were pretty safe.
In 10Base-T: CAT3 was bare minimum.