| Author |
Message |
Geoff
Guest
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 Posted:
Wed Dec 01, 2004 10:53 pm Post subject:
Two Ethernet Conns over one CAT5E |
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I am looking for folks experience running two 100baseT full duplex links
down about 50 metres of CAT5E by using the second two pair. It would be
difficult to run a second CAT5E at this time.
OK, I have done this using 10baseT half duplex with no detectable problems
but has anybody done it at 100MHz full duplex?
I think it should work, after all the crostalk level must be similar (+3dB)
to a single full duplex link.
--
Geoff |
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ABC
Guest
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| Posted:
Thu Dec 02, 2004 1:53 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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"Geoff" <geoff@nospam.demon.co.uk> wrote in message
news:Xns95B2E882B8C42geoffmailnews@158.152.254.254...
| Quote: | I am looking for folks experience running two 100baseT full duplex links
down about 50 metres of CAT5E by using the second two pair. It would be
difficult to run a second CAT5E at this time.
OK, I have done this using 10baseT half duplex with no detectable problems
but has anybody done it at 100MHz full duplex?
I think it should work, after all the crostalk level must be similar
(+3dB)
to a single full duplex link.
--
Geoff
|
100baseT requires the use of all four pairs, whereas 10baseT requires only
two of the four pairs.
S |
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glen herrmannsfeldt
Guest
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| Posted:
Thu Dec 02, 2004 2:25 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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ABC wrote:
(snip regarding two 100baseT connections on a four pair cable)
| Quote: | 100baseT requires the use of all four pairs, whereas 10baseT requires only
two of the four pairs.
|
Well, you should be a little more specific. The 100baseVG and
100baseT4 protocols use four pairs, but your chance of running
into them is extremely small. (Slightly better than winning
the state lottery.)
100baseTX uses two pairs. 1000baseT does use four pairs.
It will likely work fine, though I would try to keep well
below 100m. 50m sounds fine to me. It would be best to
wire the jacks in the normal manner and split after coming
out of the jacks. There are splitters similar to those
used for two line phones. If you have a crimper you
could crimp two cables into a single plug. I would only
recommend the latter for a home or other low budget application
such as a K-12 school.
For a commercial installation be sure to label it well so
that future network administrators know what is in place.
-- glen |
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Manfred Kwiatkowski
Guest
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| Posted:
Thu Dec 02, 2004 2:34 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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In article <Xns95B2E882B8C42geoffmailnews@158.152.254.254>,
Geoff <geoff@nospam.demon.co.uk> writes:
| Quote: | I am looking for folks experience running two 100baseT full duplex links
down about 50 metres of CAT5E by using the second two pair. It would be
difficult to run a second CAT5E at this time.
OK, I have done this using 10baseT half duplex with no detectable problems
but has anybody done it at 100MHz full duplex?
|
Yes, on several occasions.
| Quote: |
I think it should work, after all the crostalk level must be similar (+3dB)
to a single full duplex link.
Indeed, running FE twice is no worse than 1000BaseT on all four pairs. |
--
Manfred Kwiatkowski kwiatkowski@zrz.tu-berlin.de |
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Geoff
Guest
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| Posted:
Thu Dec 02, 2004 5:31 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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"T. Sean Weintz" <strap@hanh-ct.org> wrote in
news:10qud55tbommn07@news.supernews.com:
| Quote: | ABC wrote:
100baseT requires the use of all four pairs, whereas 10baseT requires
only two of the four pairs.
S
WRONG. 100baset uses only the orange and green. VGAnylan 100mb
ethernet and 100TX both use 4 pairs, but not 100baseT
I run 2 100baseT on one cat5 all the time.
|
Thanks folks for the confirmatory replies, ABC's reply threw me for a
moment :-). This is for home use and is to run two extra links to the
shed/workshop at the bottom of the garden (I have two 10baseT (but CAT5E)
cables out there but I want to run four off 10/100baseT connects.
TTFN
Geoff |
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T. Sean Weintz
Guest
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| Posted:
Thu Dec 02, 2004 8:28 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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ABC wrote:
| Quote: |
100baseT requires the use of all four pairs, whereas 10baseT requires only
two of the four pairs.
S
|
WRONG. 100baset uses only the orange and green. VGAnylan 100mb ethernet
and 100TX both use 4 pairs, but not 100baseT
I run 2 100baseT on one cat5 all the time. |
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T. Sean Weintz
Guest
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| Posted:
Thu Dec 02, 2004 8:36 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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T. Sean Weintz wrote:
| Quote: | ABC wrote:
100baseT requires the use of all four pairs, whereas 10baseT requires
only two of the four pairs.
S
WRONG. 100baset uses only the orange and green. VGAnylan 100mb ethernet
and 100TX both use 4 pairs, but not 100baseT
I run 2 100baseT on one cat5 all the time.
oops. That reference to 100tx should read 100t4. I type to carelessly! |
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Robert Redelmeier
Guest
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| Posted:
Thu Dec 02, 2004 11:44 pm Post subject:
Re: Two Ethernet Conns over one CAT5E |
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Geoff <geoff@nospam.demon.co.uk> wrote:
| Quote: | Thanks folks for the confirmatory replies, ABC's reply threw
me for a moment :-). This is for home use and is to run two
extra links to the shed/workshop at the bottom of the garden
(I have two 10baseT (but CAT5E) cables out there but I want
to run four off 10/100baseT connects.
|
Maybe it would be better to add a small 4 port hub.
Also give some isolation from lightening damage.
Running copper ethernet between buildings is always risky, moreso
if the satellite building has a subpanel and ground stake. I don't
know what UK practice is with ring mains and such. I presume
the shed has power, neutral & ground fed from the main building.
-- Robert |
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John Rowe
Guest
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| Posted:
Fri Dec 03, 2004 3:53 am Post subject:
Re: Two Ethernet Conns over one CAT5E |
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Geoff <geoff@nospam.demon.co.uk> writes:
| Quote: | I am looking for folks experience running two 100baseT full duplex links
down about 50 metres of CAT5E by using the second two pair. It would be
difficult to run a second CAT5E at this time.
OK, I have done this using 10baseT half duplex with no detectable problems
but has anybody done it at 100MHz full duplex?
I think it should work, after all the crostalk level must be similar (+3dB)
to a single full duplex link.
|
Better to use it for gigabit and fan out at each end.
John |
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Dmitri(Cabling-Design.com
Guest
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| Posted:
Fri Dec 03, 2004 9:42 am Post subject:
Re: Two Ethernet Conns over one CAT5E |
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Geoff wrote:
| Quote: | I am looking for folks experience running two 100baseT full duplex links
down about 50 metres of CAT5E by using the second two pair. It would be
difficult to run a second CAT5E at this time.
OK, I have done this using 10baseT half duplex with no detectable
problems
but has anybody done it at 100MHz full duplex?
I think it should work, after all the crostalk level must be similar
(+3dB)
to a single full duplex link.
|
It's not recommended, but if you have to do that as a last resort, here
are the pinouts and color codes for the split cable:
http://www.cabling-design.com/references/pinouts/split.shtml
Good luck!
--
Dmitri Abaimov, RCDD
http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
premises cabling users and pros
http://www.cabling-design.com/homecabling
Residential Cabling Guide
-------------------------------------
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http://www.cabling-design.com/forums
no-spam read and post WWW interface to your favorite newsgroup -
comp.dcom.lans.ethernet - 1325 messages and counting!
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CJ
Guest
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| Posted:
Tue Feb 01, 2005 1:56 am Post subject:
Re: Two Ethernet Conns over one CAT5E |
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A better solution would be to get a couple of inexpensive ethernet switches
at both ends and that way you have room to grow beyond the 2nd link you are
describing and maintain a proper connection without rigging it.
"Geoff" <geoff@nospam.demon.co.uk> wrote in message
news:Xns95B2E882B8C42geoffmailnews@158.152.254.254...
| Quote: | I am looking for folks experience running two 100baseT full duplex links
down about 50 metres of CAT5E by using the second two pair. It would be
difficult to run a second CAT5E at this time.
OK, I have done this using 10baseT half duplex with no detectable problems
but has anybody done it at 100MHz full duplex?
I think it should work, after all the crostalk level must be similar
(+3dB)
to a single full duplex link.
--
Geoff |
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