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

[danarauz at gmail.com]

Hey Charley,


Many thanks for stepping forward, and about answering your valid questions.

Actually Max pretty much answered the questions.
But, I would like to add that the small room where the phone line enters
the building has a lot of electrical cables on the ceiling and many of them
go along in part of the path that leads to CCL-Sudoroom area.

Question two, Termination:

I totally understand your point about terminating cables properly.

For example, Cat6A with Cat6A connectors + Cat6A Patch Panels; Shielded
with Shielded; etc.. I brought that up when I was working on the
Netwoork/Reboot (
https://sudoroom.org/wiki/Network/Reboot#Wishlist_.28in_progress.29) plan.

Anyhow, like Marx mentioned, this line that we are trying to run at Omni is
a phone line, so it will terminate to a small box by the two post rack,
close to the wall. We will be using just a punch down tool.

Max, thanks for answering these questions. The only thing I would like to
mention is that we want to stay away from CAT5, if the case is that we
cannot have CAT6 or CAT6A type, then the minimum should be CAT5e (e for
enhanced). (
http://midwesttelephone.com/wp-content/uploads/2015/02/Speed-comparrison2.jpg
)

Thanks!

Daniel

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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>> sudo-discuss at lists.sudoroom.org
>> https://sudoroom.org/lists/listinfo/sudo-discuss
>>
>>
>


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