Two questions that was not always clear for me [sorry for posting to this list :\]: ############################################################################################## Q1) when cabling, is the color order important? like: straight cabling: A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown could be eg.: like this?? A side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orange B side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orange ############################################################################################## Q2) again cabling.. i know what is the color order of straight and crossover cabling. BUT: what are the color orders, when i need to create physically two separated networks? 568B; straight; nic to switch: A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown ---------- 568A; crossover; nic to nic: [it's not so important about from ~2005]: switch the pairs: 1&2 with 3&6 on one side: A side: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown ---------- one cable, two straight networks: A side: I.: II.: B side: I.: II.: ---------- one cable, two crossover networks: A side: I.: II.: B side: I.: II.: ---------- one cable, one straight and one crossover network: A side [straight]: I.: II.: B side [crossover]: I.: II.: ---------- one cable, one crossover and one straight network: A side [crossover]: I.: II.: B side [straight]: I.: II.: ############################################################################################## Thank you for any pointings, links, or specific answers. Happy Christmas!
On Sat, Dec 25, 2010 at 8:12 PM, S Mathias <smathias1972 at yahoo.com> wrote:> Two questions that was not always clear for me [sorry for posting to this > list :\]: > > > ############################################################################################## > > Q1) when cabling, is the color order important? like: > > straight cabling: > A side: white-orange, orange, white-green, blue, white-blue, green, > white-brown, brown > B side: white-orange, orange, white-green, blue, white-blue, green, > white-brown, brown > > could be eg.: like this?? > A side: white-orange, brown, white-blue, green, white-green, blue, > white-brown, orange > B side: white-orange, brown, white-blue, green, white-green, blue, > white-brown, orange >Although logically it appears that the wiring should work, I suggest you stick with the official 568A/B scheme, especially if you are using Gigabit fabric (all four TPs are used) Pls. see <http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm> <http://en.wikipedia.org/wiki/Category_6_cable> <http://en.wikipedia.org/wiki/Ethernet_crossover_cable> HTH -- Arun Khan -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20101225/d8285462/attachment-0001.html>
On 12/25/10 6:42 AM, S Mathias wrote:> Two questions that was not always clear for me [sorry for posting to this list :\]: > > ############################################################################################## > > Q1) when cabling, is the color order important? like: > > straight cabling: > A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown > B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown > > could be eg.: like this?? > A side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orange > B side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orangeno. its critical that the pairs be maintained. ethernet uses differential signalling on pairs. whote/orange and orange/white are a twisted pair, as is each other combination of white/color and color/white. the longer the cable, the more critical this becomes (eg, you could perhaps get away with it on a 2 meter patch cord, but a 30 meter run in a wall would most certainly have crosstalk problems).> ############################################################################################## > > Q2) again cabling.. i know what is the color order of straight and crossover cabling. BUT: what are the color orders, when i need to create physically two separated networks?terrible idea. gigE uses all 4 pairs for a single connection anyways, so you *can't* double up on a patch cord.> 568B; straight; nic to switch: > A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown > B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown > ---------- > 568A; crossover; nic to nic: [it's not so important about from ~2005]: > switch the pairs: 1&2 with 3&6 on one side: > A side: white-green, green, white-orange, blue, white-blue, orange, white-brown, brown > B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown568A and B aren't straight vs crossover. they are simply two different schemes for the order of the pairs to the connector. basically, they swap the green and orange pairs. I would stick with T568A> ---------- > one cable, two straight networks: > A side: > I.: > II.: > B side: > I.: > II.: > ---------- > one cable, two crossover networks: > A side: > I.: > II.: > B side: > I.: > II.: > ---------- > one cable, one straight and one crossover network: > A side [straight]: > I.: > II.: > B side [crossover]: > I.: > II.: > ---------- > one cable, one crossover and one straight network: > A side [crossover]: > I.: > II.: > B side [straight]: > I.: > II.:thats giving me a headache just thinking about it. DO NOT PUT TWO NICs ON ONE RH45 CONNECTOR
Hi am blind and wonder if there is a way to install cent with speech?
On 12/25/2010 9:42 AM, S Mathias wrote:> Two questions that was not always clear for me [sorry for posting to this list :\]: > > ############################################################################################## > > Q1) when cabling, is the color order important? like: > > straight cabling: > A side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown > B side: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown > > could be eg.: like this?? > A side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orange > B side: white-orange, brown, white-blue, green, white-green, blue, white-brown, orangeThe colors are not important aside from standardization. If you need to fix one end of the cable, you have to make sure it's the same as the other end. If you use the standard color scheme, that is not a problem. What IS important is the pairing. In your second example, you have messed up the pairings. This may work, but is not optimal. You could do something like this: white-brown, brown, white-orange, blue, white-blue, orange, white-green, green But there is really no reason for it. Just stick to the standard colors and save yourself (and anyone else who works on the cabling later) the headaches.> ############################################################################################## > > Q2) again cabling.. i know what is the color order of straight and crossover cabling. BUT: what are the color orders, when i need to create physically two separated networks?Sorry, I don't follow this question. -- Bowie