[EdLUG] Cat6 or regular phone cable for 60m distance?

Thu Jun 30 11:36:35 UTC 2016

Thanks all for responses

I ended up being able to talk to the electrician who requested phone
extension line; I am made to understand that this would carry the signal
far enough

Apologies I forgot to specify that this is in an office building, and the
exchange box is in a room along a few corridors with locked doors on the
way, so we couldn't really put the router there.

I think there was a fault in my thinking in the first place where I was
imagining putting the filter at the "wall" (it looks like a regular wall
block, dangling off the exchange rack - the tentel engineer did that, not
me!) and then using Ct5e/Cat6 from there to the router, forgetting that
that length could not have been ethernet cabling anyway...

I still don't know the name of the cable type; all I can see is that it has
4 wires in it so it sounds like what David is describing as the Cat3....

Can I assume that when wiring at home (different scenario now) that if I
plug the router into a socket that's not the primary one (and instead,
plugging into an outlet that was installed as an extension), I am doing it
wrong from a data-throughput-maximization point of view? Or can Cat3 still
carry a high rate of digital signal (with other tradeoffs instead)?

===
Tai Kedzierski

Affordable Office IT for Freelance and Startup Businesses
http://helpuse.com/

  I use www.libreoffice.org

*Open Source Free Software is a matter of liberty, not price.*
http://bit.ly/foss-why-care

On 29 June 2016 at 18:29, Edinburgh Linux Users Group <
edlug at lists.edlug.org.uk> wrote:

>
>
> On 28 June 2016 at 19:04, Edinburgh Linux Users Group <
> edlug at lists.edlug.org.uk> wrote:
>
>>
>> On 28 Jun 2016 6:25 p.m., "Edinburgh Linux Users Group" <
>> edlug at lists.edlug.org.uk> wrote:
>> >
>> > Hello
>> >
>> > I need to wire a router in one room to a phone socket, 60m away.
>> You've not said if this is ADSL or VDSL, but I'm not sure it would matter
>> in regards to the answer...
>> Do you really need to do that, or could you run a network cable from the
>> router 60m away and plug it into a switch where you need the ports?
>> Ethernet is probably way more tolerant than ADSL/VDSL.
>>
> VDSL is the newer version of ADSL and therefore both are technologies to
> run data communications over the full available spectrum (bandwidth) of
> ordinary copper telephone cabling used in the last mile deployment.  DSL
> suffers from exponential decay of signal quality, so you always want to
> place your DSL modem as close to the exchange as possible, and this usually
> means immediately at the wall. For ADSL2+, if you are right next door to
> the exchange you will get the full 24Mb Down and 1Mb Up, but at 800 metres,
> this drops to about 16Mb Down, at 2000 meters, this drops to about 8Mb
> Down, at 4000 meters this drops to 2 - 4Mb and about 400k up, but your
> milage may vary.
>
>
> > I am wondering what the best cable choice is for reliability and
>> maximized data thrgouhput - attach the filter at the wall and run long
>> cat6, or run phone cable from the wall to the router and attach filter
>> there?
>> I would advise having the filter connected directly to the socket, or
>> replacing the socket with one that has the filter built in.
>>
> Put  your filter and router by the wall, then run 60m of Cat 5e and then a
> switch and an access point (there is little point of going to Cat 6).  From
> wikipedia:
>
> Each 1000BASE-T network segment can be a maximum length of 100 meters (328
> feet), and must use Category 5 cable or better (including Cat 5e and Cat 6).
>
>
> Cat 6 is bulkier and more difficult to handle, and generally not worth the
> effort, unless you have a very good reason.
>
> Unless you know that there is a lot of EM / RF interference along where
> you putting the cabling you should get full gigabit transfer.
>
>> >
>> > I guess my main problem is that I cannot find what the name/definition
>> of regular phone cable is to look up its properties....
>> I don't think you'd notice a difference between cat5e and cat6 cable, but
>> either of these would likely perform much better than telephone wire due to
>> the tighter twisting of the pairs. You might find that shielded twisted
>> pair (STP) cable performs slightly better than unshielded (UTP), depending
>> on electrical noise, etc. There doesn't seem to be much information on the
>> normal telephone cable, but I think it's CW1308 (which seems to me to be
>> incorrectly listed as 4 wire cat5e - I'm sure that 5e has 4 pairs/8 wires,
>> but feel free to correct me on any point). You can also pick up similar
>> cable with 8 conductors, that I'm sure I've seen used in old alarm
>> installations.
>>
>> Phone cabling (POTS / Plain Old Telephone System) is typically 2 pair
> Category 3 UTP (Unshielded Twisted Pair), but can come in much bigger
> bundles.
>
> Do not use STP (Shielded Twisted Pair) as you have to ensure it is
> grounded to begin with, and even then its frequency response, attenuation
> and impedance is different from UTP.  Ethernet is designed to use UTP, not
> STP!  UTP is designed to cancel out noise through the twists in the pairs.
> The one thing to note about long distances, is the earthing or grounding.
> For example, if you are running a cable between two buildings, then the
> ground potential (voltage) can be different enough to affect the operation
> and health of your equipment.
>
> David
>
> --
>
> +-------------------------------------------------------------------------------------
> David
>
> Email   |  david at hackbinary.com
>
> I have no doubt that in reality the future will be vastly more surprising
> than anything I can imagine. Now my own suspicion is that the Universe is
> not only queerer than we suppose, but queerer than we can suppose.
>  - J.B.S. Haldane
>
> +-------------------------------------------------------------------------------------
>
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