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NEC Cat-5e

Data speed on short cable

By Mini Me - usenet poster


Hi all,
Maybe a "novice" question, but I have a 3 system network using a switch.
I've just been "advised" that 100 Mbps isn't possible over a 2metre Cat 5e
cable (only 10 Mbps). Is this right??

Hard/software (if nec):
1x 10/100Mbps Switch
2x 10m Cat 5e UTP cable (RJ45 terminated)
1x 2m Cat 5e UTP cable (RJ45 terminated)
3x 10/100Mbps NIC's
2x Win98SE
1x Win2kPro
Assigned I.P. addresses

I've changed the 2m cable for a 10m cable and the network seems no quicker.
(I wouldn't expect the network to be too quick as the "workstations" are
200MHz and 233MHz CPU machines!!)
Rgs
Neil

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Solution #1
posted on Aug 11, 2005
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LiZzIe

LiZzIe - usenet poster

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Well, they were surplus to requirement when the company I used to work for
changed offices and moved 300 miles south...  there were about 20 spare and
the IT admin gave me 5 for myself...

but they can be made up easily...

Think of it this way...  if you put a socket on one wall and a socket on the
other, then put two keystone jacks in them, you basically have to have a
tiny bit of cat5 running between the 2.

I've done this and have a 2 inch piece of cat5 running from one socket to
the other actually, the sheathing is about 1 cm as the separate wires need
to be separated into the jacks.

I don't think there is a minimum restriction...  as long as the data can
flow...  too long however and it will cause problems

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Solution #2
posted on Aug 11, 2005
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Horner

Horner - usenet poster

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That has already been mentioned at the start of the thread

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Solution #3
posted on Aug 11, 2005
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herself

herself - usenet poster

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Are those homebrew or did you purchase???

If you purchased, then could you tell me your supplier please...

--
B-)

Grumps II...you know you're old when the latest granddaughter has more
hair than you!!!

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Solution #4
posted on Aug 11, 2005
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2Pansy

2Pansy - usenet poster

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max for utp cat 5 is 100 meters

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Solution #5
posted on Aug 11, 2005
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jessie25

jessie25 - usenet poster

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{R} Richard Ashton" <{ @semolina.org> wrote in message



I have a couple of 6 inch CAT5e patch leads.

Very useful for patching routers and hubs together

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Solution #6
posted on Aug 11, 2005
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Grant

Grant - usenet poster

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There are no short limits in the spec, but I've seen some speculation that
less than 0.5 metres may cause issues due to not enough twists to prevent
cross-talk.

Could well be bollox - I'm not an electrical engineer (anyone?)

Woz

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Solution #7
posted on Aug 11, 2005
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Grant

Grant - usenet poster

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In the comms room where I used to work, we regularily used 1m Cat5e cables
to interconnect between hubs, switches and patch panels when the chips were
down. Always got full speed (100Mbps) out of them.

G

--

  ?? . ?? . ?? . ?? . ?? . ?? . ?? . ?? .
  Gerard McGovern
  Webmonkey to the stars

    http://www.inkiboo.com

  ?? . ?? . ?? . ?? . ?? . ?? . ?? . ?? .

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Solution #8
posted on Aug 11, 2005
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Ross

Ross - usenet poster

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On Thu, 18 Oct 2001 23:27:49 +0100, Gerard McGovern
   <c @inkiboo.com> wrote:

But when the chips are down you don't usually get any signal!
(Sorry...)

I have seen some sort of minimum distance on cables, it may have been
for 'crossover' cables only though.  It's not a problem for me, all my
cables are 5m minimum.  (My memory is suggesting 2ft, not 2m, for the
minimum distance, though, and few people wil have cables that short.)

Chris C

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Solution #9
posted on Aug 11, 2005
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Putty

Putty - usenet poster

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Ha, like it :-) If it gets that bad, it's time to go home :-)

That rings a bell ... not sure why. I know I've used a 1ft Cat5e cable and
everything still ran fine.

G

--

  ?? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ???
  Gerard McGovern
  Webmonkey to the stars

    http://www.inkiboo.com

  ?? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ??? ?? ???

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Solution #10
posted on Aug 11, 2005
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maartenw

maartenw - usenet poster

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There is that but from what i can remember from a year at uni i dont think
this would become a problem uless your transfer huge files. In which chanse
things might lock up and the computers will have to resend data due to
corruption. This might slow down the speed of the actual transfer but i dont
it could be as detremental as to slow it down to 10mbs.

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Solution #11
posted on Aug 11, 2005
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M0nica L

M0nica L - usenet poster

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To muddy the waters a bit I've got 2 very short leads (6-8 inches) in
my network, made from flat cable with RJ45 plugs at each end & it
appears to have little effect on speeds etc, the network is running
100base full duplex, the leads are between 3 different pieces of
equipment all stacked together on a shelf (CM, Router & Print
Server)....

And why so short, well I was being taken over by the creeping tide of
wires so had to do something...

I'm not recommending, I'm just commenting on what works for me at the
moment (until I find something better)....

--
B-)

Grumps II...you know you're old when the latest granddaughter has more
hair than you!!!

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Solution #12
posted on Aug 11, 2005
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LiZzIe

LiZzIe - usenet poster

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i am using a 1.5m cross over cat 5 cable and it works fine at 100. so does
the 15m cable that ive got.

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Solution #13
posted on Aug 11, 2005
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Powe33

Powe33 - usenet poster

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That's absolute rubbish.. !!!  you can obtain speeds of 100Mbps on a CAT5
cable up to I believe 100m. I may be wrong here..  but I know for sure that
2m is most definately wrong...

I have a 130ft cable in my house that has no problem transferring at 100mbps

Transfer speed depends on network conditions. If it's set up ok.. it will be
fine.

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Solution #14
posted on Aug 11, 2005
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Rogers

Rogers - usenet poster

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You are spot on for the 100 MB over 100 meters... 10Mb can go upto 300
meters ( not recommended without a hub or a booster)

Beebock

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Solution #15
posted on Aug 11, 2005
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Rachel007

Rachel007 - usenet poster

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In article <9qd7of$1o @plutonium.btinternet.com>,
bestsyst @btinternet.com says...
Better tell it to my client who is running 100MBit over a 50 metre cable
run from the Hub to wallsocket. There is a total of about 90-100metres
running from the hub.

--
_________________________
Conor Turton
conor.tur @bigfoot.com
ICQ:31909763
_________________________

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Solution #16
posted on Aug 11, 2005
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Cornish

Cornish - usenet poster

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Um i personally wouldnt wanna take 10 mbps over a 100m as laid down in the
ieee standards.
node length should be a max of 100m including patch cables at either end !!

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Solution #17
posted on Aug 11, 2005
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Bouncy

Bouncy - usenet poster

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Cheers Beebok..

Incidently, Neil... If you ever do want to go over 100m, you'd need a
network amplifier of sorts..

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