UTP cables

[olocin]

hi guys!

Just wanted to clear thing up about UTP Cables and data transmission. Based on the Exhibits below, does Exhibit B and Exhibit C affects the packets (data transmitted) on the cables? If so how does Exhibit B and Exhibit C differ?

Thanks guys your help is greatly appreciated.

I dont know if i posted at the right forum, please correct me if i miss posted. Thanks

----> EXHIBIT A

----> EXHIBIT B

----> EXHIBIT C

[Bigbrit]

Wiring for RJ45 plugs Looking from the non clip side, left is #1

ID# Wire color (Both Ends)

1 White/Orange

2 Orange/White

3 White/Green

4 Blue/White

5 White/Blue

6 Green/White

7 White/Brown

8 Brown/White

e.g. White wire with Orange stripe == White/Orange

Orange wire with White Stripe == Orange/White

Setup the wires as above, hold and trim using side cutters to 5/8”

Push all the way into the clip and check the wires:

White – Color – White – Color all the way along.

[olocin]

hi Bigbrit thanks for the reply. Im sorry, maybe my question wasnt clear enough, I know the straight and cross connection.

The flow of data on Exhibit A is of course continious (no interruption)regardless of whether you use cross or straight. The question lies on Exhibit B and Exhibit C.

here's a scenario.

if i was cabling a department using CAT5e then i got short on the cable measurement (say miss calculation on the length) instead of re-cabling the entire department i sorted in adding an extension on each cable. I will use Exhibit B or Exhibit C to extend the Cables. here's the question.

Will there be an interuption or problems when packets are transmitted through that wire?

Which is reliable Exhibit B or Exhibit C?

[nitroshift]

Which is reliable Exhibit B or Exhibit C?

Definitely NOT Exhibit C!!!! Also, in Exhibit B make sure the contacts are not loose.

[Bigbrit]

I did a project recently where the Cable Puller (an Electrician) pulled short.

He pulled a few cables short of the patch panel. I did the same as you, punched a Cat5e end

onto the cable and made my own cable to the patch panel.

If you can, use a short patch cable rather than a "home made" cable.

p.s. The above passed on a Fluke test.

[olocin]

thanks Guysfor the reply, I appreciate the time and effort. Thanks Again

[LLXX]

Which is reliable Exhibit B or Exhibit C?

Definitely NOT Exhibit C!!!! Also, in Exhibit B make sure the contacts are not loose.

Exhibit C will work fine, just use wire nuts and electrical tape.

[jcarle]

Which is reliable Exhibit B or Exhibit C?

Definitely NOT Exhibit C!!!! Also, in Exhibit B make sure the contacts are not loose.

Exhibit C will work fine, just use wire nuts and electrical tape.

...

this is NOT car wiring, this is high speed, sensitive, data signals.

Exhibit C will cause data loss, packet re-transmits, it's not shielded and there's added resistance in the connection.

Exhibit B is the prefered choice in a desperate situation, but the best option is to rewire using a full length, uncut, uninterrupted cable.

[CoffeeFiend]

jcarle: agreed on all points. Someone using that C method for network stuff would be fired on the spot.

[LLXX]

The cable connecting the machine I'm using right now to the router is spliced in several places like that and yet it's working fine at the full 100Mbps... maybe I just did a better job of it or it's just not near any sources of interference

Exhibit C will cause data loss, packet re-transmits, it's not shielded and there's added resistance in the connection.

UTP means unshielded-twisted-pair

[jcarle]

UTP means unshielded-twisted-pair

Well, I'll give you that. But the rest?

[CoffeeFiend]

Working "at 100Mbps" (as in not at 10) doesn't mean performing as good as it could. UTP is twisted for a reason, non-twisted parts should be avoided as much as possible (connectors and such included). Splices really does affect the electrical performance of a cable, you can easily see them with a TDM. NO professional installer would splice UTP - especially nowadays where we often lay 5e or better and with Gbit ethernet gaining a lot in popularity (the switches are coming down a lot in price). I've never tried to do some ghetto UTP splice on a gigabit connection to see how bad it performs, but I'm sure I wouldn't want that on my network. Splicing UTP is the absolute last resort, it screws up the cable's electrical properties. And even if it came down to splicing, I still wouldn't use a pigtail splice like that, that's meant for electricians, in junction boxes - NOT telecoms! Same goes for Marettes and such - not on telecoms cables!

[tosk]

Splicing cables is also not "up-to-code." In an environment where you would most likely be installing UTP (ie-not a private residence), you would need to make sure that all wiring and cable runs meet industry standards at the time you perform the installation.

I think that joining small segments of cable together as shown in Exhibit B would even be acceptable to code regulations. I know for sure though that Exhibit C would not only get you fired, but possibly fined at the same time.

[olocin]

hi, thanks guys for your interest on the subject. maybe i'll stick to Exhibit B, this is my last resort. You all have a point, and as TOSK said Exchibit C is not industry standard, and as a network administrator you would not want your cables to look like Exhibit C , Thanks again.