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'[OT:] strings inside cables'
2004\02\11@083410 by Hulatt, Jon

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I've spent this morning mostly terminating cat5e cable in krone blocks. Mind
numbingly dull, it lead me to wonder why some cables have a cotton or nylon
string in them? The only reason I can see for it is merely to irritate the
user, but maybe there's a real purpose. Can anyone shed any light on it??

Jon

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2004\02\11@084031 by Alan B. Pearce

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.I've spent this morning mostly terminating cat5e cable in
>krone blocks. Mind numbingly dull, it lead me to wonder why
>some cables have a cotton or nylon string in them? The only
>reason I can see for it is merely to irritate the user, but
>maybe there's a real purpose. Can anyone shed any light on it??

I have been told, but unable to confirm it, that this is a colour coded
"symbol" that enables tracing of the manufacturer, and batch number. This is
needed as it is possible to cut the cable to such a short length that any
writing on the jacket identifying the manufacturer or batch number can be
outside the length of cable fitted. Perhaps someone involved in the cable
industry can confirm this.

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2004\02\11@141247 by Richard.Prosser

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Jon,
There are a number of reasons for "strings"  & "Threads" to be placed
inside cables.
1. An ID thread - this identifies the manufacturer
2. A year thread to identify year of menufacture. This should  dissolve in
acetone (to distinguish it from the manufacturer ID.)
3. Fillers, to make the cable nice and round if it is exposed to view.
4. Binders to hold differnt groups (units) or bunches of wires/pairs
together. This also enable pair identification in large cables by using
different colours or marker tapes. Also, the cable may be wrapped overall
to assist manufacture.
5. A ripcord to aid removal of the cable sheath. In theory you just grap
the cord with a pair of pliers and it will tear thrrough the sheath.

I'm not sure these days what the requirement is for ID & Year threads, Most
cables don't seem to use them so it may only be required on cable built to
certain specifications.

Richard P (ex cable engineer)





I've spent this morning mostly terminating cat5e cable in krone blocks.
Mind
numbingly dull, it lead me to wonder why some cables have a cotton or nylon
string in them? The only reason I can see for it is merely to irritate the
user, but maybe there's a real purpose. Can anyone shed any light on it??

Jon

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2004\02\11@153338 by John Plocher

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Alan B. Pearce wrote:
> .I've spent this morning mostly terminating cat5e cable in
>
>>krone blocks. Mind numbingly dull, it lead me to wonder why
>>some cables have a cotton or nylon string in them?

It is used to cut/strip the insulation jacket back when punching down
to 66/110 blocks:

       take cable in hand
       use wire stripper to strip off outer sheath 2" from an end
       tease out string with fingers
       grasp string in one hand
       grasp 2" of unsheathed wire in other
       pull string down along wire jacket, causing it to cut jacket
       when enuf jacket has been freed, snip it off
       punch down exposed wires to block.

The wires on the 2" end may have been nicked as you stripped
the end with the mechanical stripper, so they get discarded
as you punch and cut.

  -John

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2004\02\11@153751 by Dan Oelke

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Hey - since we have someone here who seems to know something about the
topic I have a follow up question.

Are any of those threads meant for strength when pulling a cable through
conduit, walls, etc?  I'm thinking about the nylon that I find in a lot
of Cat5 cabling that I don't believe is a filler (cable isn't very
round), binder (cable doesn't need it for 4 pair), or ripcord (Cat5
shouldn't be stripped back more than an inch).

Thanks
Dan

spam_OUTRichard.ProsserTakeThisOuTspamPOWERWARE.COM wrote:

{Quote hidden}

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2004\02\11@161152 by Richard.Prosser

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I don't think the strings would contribute much to pulling-in strength as
by the time they had the slack taken out of them and their elasticity taken
up the cable would have been too extended. But I could be wrong. We didn't
do cat 5 cable due to the reluctance of the management at that time to
spend money on the required test equipment. (and upgrading the process
equipment to enable it to manufacture cable that actually met the specs!)

But of course, strings & fibres are added to some cables (e.g. optic fibre
cables) to increase physical strength so it may be possible, particularly
if they are applied under a small amount of pretension. Do the ends of the
string shrink back when cut ? This would be an indication of any preload
applied.

Richard P



Hey - since we have someone here who seems to know something about the
topic I have a follow up question.

Are any of those threads meant for strength when pulling a cable through
conduit, walls, etc?  I'm thinking about the nylon that I find in a lot
of Cat5 cabling that I don't believe is a filler (cable isn't very
round), binder (cable doesn't need it for 4 pair), or ripcord (Cat5
shouldn't be stripped back more than an inch).

Thanks
Dan

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2004\02\11@180953 by steve

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On 12 Feb 2004 at 8:06, .....Richard.ProsserKILLspamspam@spam@POWERWARE.COM wrote:

> 3. Fillers, to
> make the cable nice and round if it is exposed to view.

This is important if you need to get a seal on a cable through a gland
where there will be a pressure differential between the inside and
outside of the cable. ie. underwater.

Steve.


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2004\02\11@183310 by Dwayne Reid

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At 06:25 AM 2/11/2004, Hulatt, Jon wrote:
>I've spent this morning mostly terminating cat5e cable in krone blocks. Mind
>numbingly dull, it lead me to wonder why some cables have a cotton or nylon
>string in them? The only reason I can see for it is merely to irritate the
>user, but maybe there's a real purpose. Can anyone shed any light on it??

If this is a real thin but strong string (thin enough to cut your fingers
if you pull on it real hard), it is used to rip the cable jacket so that
you can expose long sections of the twisted pairs.  Try it: strip off a
couple of inches of jacket, find the string, make sure that it is not
wrapped around the inner conductors, then pull it straight off to the
side.  Viola! instant twisted pairs of wires available.

dwayne

PS - which standard do you crimp your RJ45 connectors to? A or B?

dwayne

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2004\02\11@231859 by Denny Esterline

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> conduit, walls, etc?  I'm thinking about the nylon that I find in a lot
> of Cat5 cabling that I don't believe is a filler (cable isn't very
> round), binder (cable doesn't need it for 4 pair), or ripcord (Cat5
> shouldn't be stripped back more than an inch).
>
> Thanks
> Dan

For most network applications I agree with you, it shouldn't be stripped
back more than a couple inches, but usage of cat 5 isn't limited to just
networks. It's commonly used for telephones, alarm systems and long serial
cable runs just to name a few. And I won't even mention the short pieces I
use for my breadboard :o)

-Denny

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2004\02\12@034627 by William Chops Westfield

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On Wednesday, Feb 11, 2004, at 13:05 US/Pacific,
EraseMERichard.Prosserspam_OUTspamTakeThisOuTPOWERWARE.COM wrote:

> I don't think the strings would contribute much to pulling-in strength
> as
> by the time they had the slack taken out of them and their elasticity
> taken
> up the cable would have been too extended.

I'm pretty sure some of the fiber cable has kevlar strings added for
pull
strength.  you don't want to be stretching glass fibers!  (kevlar does
not stretch to speak of...)

billw

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2004\02\12@045839 by Hulatt, Jon

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> PS - which standard do you crimp your RJ45 connectors to? A or B?
>
> dwayne

> ---


"B". Only because the patch panels we originally bought had only B Scheme
printed on them.

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2004\02\12@141356 by Richard.Prosser

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Oh yes, Optic cable was something we did make.

Most of it used a steel strength member but there was also the non-metallic
Kevlar (and GRP) strengthened types. However, manufacturing the cable so
that the kevlar strands were all at the same tension and did not introduce
a twisting moment on take-up, was something of an art.
The cables, however were generally well regarded as far as strength went -
we saw some horrific tensions applied at times under "emergency repair" and
other conditions and had few complaints about failures. Just before I left
we were working on a shotgun resistant jacket. Not very successful at that
time but it was fun testing it!

Our Australian company manufactured a cable designed to be laid over
marshland. The core was a sort of sponge rubber and the cable was designed
to elongate. As the cable stretched, the pitch circle diameter of the optic
fibre path reduced and so extra fibre was available for the elongation.
Quite clever and I think it would withstand about 10% elongation (maybe
more?). Very expensive though and never very popular with the customers.

Richard P




On Wednesday, Feb 11, 2004, at 13:05 US/Pacific,
Richard.Prosserspamspam_OUTPOWERWARE.COM wrote:

> I don't think the strings would contribute much to pulling-in strength
> as
> by the time they had the slack taken out of them and their elasticity
> taken
> up the cable would have been too extended.

I'm pretty sure some of the fiber cable has kevlar strings added for
pull
strength.  you don't want to be stretching glass fibers!  (kevlar does
not stretch to speak of...)

billw

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