29 Aug
2015
29 Aug
'15
2:44 p.m.
Hey Andrew,
I am wondering if you had the chance to bring the boxes of cable?
I came in to Sudo during the week and now again (today Saturday), but I
don't see any boxes here; at least if they are stored in some secret room.
Thanks,
Daniel
On Tue, Aug 25, 2015 at 12:54 PM, danarauz(a)gmail.com <danarauz(a)gmail.com>
wrote:
Hey Andrew, that is awesome, many thanks!
Daniel
On Tue, Aug 25, 2015 at 1:44 AM, Andrew Lowe <andrew(a)lostways.com> wrote:
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Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
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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(a)gmail.com> wrote:
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Help open a people-powered common space in Oakland, California!
https://omnicommons.org/donate
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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(a)acm.org>
wrote:
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Andrew Lowe
http://www.lostways.com
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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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