Cat5e Standards

[chiefred]

I am looking for a reference or a direct quote from standards on the length of exposed wire of all pairs, that can be untwisted from the jacket end to the termination. I have seen a few comments that state 1/2" or less from jacket end that can be untwisted----

I am not sure what exactly this means---If I terminate with the jacket flush to the cat5e connector and the pairs untwisted from that point to the terminating posts in the modular plug---does that fall within standards?

Thanks for any help and references

Chiefred

 

[mrpeabody]

The standard is don't untwist the wires more than 1/2 inch. Years ago, I learned how to terminate CAT-5 from a class that Leviton held. This was before the CAT5e standard, but it seemed they were pioneers in the industry. They told us that running the cable and terminating it their way gets 650 megabits out of regular CAT5 cable. In addition, putting male RJ-45 Modular ends on the cable is not recommended, because you cannot maintain the twist inside the connector, whereas a jack insert continues the twist right up to the female-end pins.

 

[Bobg1]

I don't have the spec in front of me, but what it says is that you must maintain the twist to within 1/2" fo the point of termination.
Now you mention plug in your message, so I am assuming that you are crimping plugs onto patch cords. On most plugs the jacket should extend approx 1/4" into the body, past the hold down clamp that snaps in when crimped. If you were to measure from that point to the point that the pins go into the individual wires, it should be less then 1/2".
If this is the case, then yes you can have the wires untwisted from the end of the jacket.

Now you had mentioned the jacket flush to the connector, to start with this would not be a proper termination and your twist would be extended to far from the point of termination.

 

[chiefred]

Thanks to Jonvine and BobG1 --what I meant by plug is the cat5 modular connector --- my question is regarding whether if I strip the jacket back and bring it to the end of the connector and untwist the pairs from this point to termination posts--on mostly all connectors--the distance between the end and the furthest termination points is 1/2 inch or less, then I would be within standards--but -- I really need to know if this is how the standard is interpreted.

Thanks again and hopefully there will be more input

Regards
Chiefred

 

[daronwilson]

Hope this is what you are looking for:

EIA/TIA 568-B.1 Section 10.2.3 states:


"When terminating category 5e and higher cables, the cable pair twists shall be maintained to within 13mm(0.5in) from the point of termination."


Simply, only remove as much jacket as necessary to make the termination, keep the pairs in the original configuration inside the jacket as close the to termination point as possible, and only untwist the minimum you need to make the connection NEVER untwisting more than 1/2". This distance is measured from the IDC portion of the jack where the wire actually makes connection to the point that both wires of the pair join and begin to twist.

Hope that helps.


It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com

 

[chiefred]

Thanks Daron

You gave me the info I needed.

Regards
Chiefred