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

[danarauz at gmail.com]

Hey Andrew, that is awesome, many thanks!

Daniel

On Tue, Aug 25, 2015 at 1:44 AM, Andrew Lowe <andrew at lostways.com> wrote:

> 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
>>>
>>> _______________________________________________
>>> sudo-discuss mailing list
>>> sudo-discuss at lists.sudoroom.org
>>> https://sudoroom.org/lists/listinfo/sudo-discuss
>>>
>>>
>>
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>
>
> --
> ---------
> Andrew Lowe
> http://www.lostways.com
>
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>


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