[sudo-discuss] Can someone please donate Cat6 Shielded cable?

[Andrew Lowe]

I have boxes of cat 6 cables to donate, and cat5e. I'll try to stop by
tomorrow during the day to drop them off.

On Tue, Aug 25, 2015 at 1:38 AM, max b <maxb.personal at gmail.com> wrote:

> Hey Charley,
>
> You're more than welcome to donate money (or time) if that's more up your
> alley. Also, if you want to donate UTP cat6, we'll take that as well. We
> use a bunch of ethernet cable both at the omni and for other installations,
> so we can always use more. If you're feeling really generous, we can really
> use shielded outdoor cat5 and cat6 for installing antennas. Don't worry -
> no matter what kind of ethernet cabling you feel like donating, we can
> almost certainly find a use for it :)
>
> As for the questions you've outlined:
>
> First thing: shielded cable
>
> This isn't actually an ethernet run. It's dsl lines + phone lines running
> over cat copper wires. As such, it's my understanding that it's more
> sensitive to EMI disturbance. Additionally, it's much better to err on the
> safe side as we'll only want to string this once and the entire network
> communications infrastructure depends on the dsl signal that passes through
> this line. As for needing shielded mating jacks, we have plenty of grounded
> rj-45 connectors and with whatever other scenarios, it's pretty easy to
> ensure that they're grounded. We're not talking about our entire network
> infrastructure, we're just talking about this one cable run.
>
> Second thing: hand termination
>
> We're using an EZ RJ-45 crimper, which makes the process fairly
> straightforward. We have spools of other types of ethernet cables and have
> done runs throughout the building. Also - we'll be breaking out these pairs
> anyhow, so most of this is fairly non standard types of termination which
> are much easier than rj-45 disconnects.
>
>
> Daniel, let us know if I missed anything here?
>
>
> Max
>
> On Tue, Aug 25, 2015 at 2:01 AM, Charley Sheets <rcsheets at acm.org> wrote:
>
>> Hey Daniel,
>>
>> I am interested in helping out, but I have to admit I'm fairly
>> skeptical of two elements of this request, so I'd like to get some
>> clarification if possible.
>>
>> First thing: shielded cable. My understanding is that most of the noise
>> rejection comes from the twists, not the shielding, and that shielded
>> cable is only useful in high-EMI environments. Am I mistaken about the
>> application, or are we perhaps in a high-EMI environment? The standard
>> example of high EMI is something like a factory floor. Shielding also
>> only works as intended if the mating connectors (jacks and whatnot) are
>> also shielded. Does that apply here? My inclination is to donate
>> standard (UTP) cat6 cable. Please help me understand why I should
>> donate shielded cable instead.
>>
>> Here is some information (could be biased -- it's from a cable
>> supplier) about the differences as they apply to cat6a:
>> http://mirapath.com/blog/item/cat6a-shielded-or-unshielded
>>
>> Second thing: hand termination. You've stated a preference for a box of
>> several hundred feet of cable. To me that implies that you'd prefer to
>> hand terminate the cable rather than having pre-terminated cables. I
>> certainly won't make any claims about your personal ability to
>> terminate cables, but most people are not especially skilled at this,
>> and many hand terminated cables I've seen in the field are visibly not
>> well made. I've terminated cat5 and cat5e cable, and it's always been
>> very fiddly and challenging for me to minimize the untwisted distance,
>> and to ensure there are no open pins. Pre-terminated cable is
>> available with strain relief boots and is often certified to be
>> complaint with the relevant cabling standard. What do you see as the
>> advantage of spools of cable? Why not buy pre-terminated cable?
>>
>> I hope this doesn't come across as overly critical. Sorry if it does. I
>> really just want to make sure we get exactly what we need.
>> --
>> Charley Sheets
>>
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>>
>
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-- 
---------
Andrew Lowe
http://www.lostways.com
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