DSL TESTING for Outside Plant

Have a question or want to start a discussion? Post it! No Registration Necessary.  Now with pictures!

Threaded View


I really could use some help finding some documentation on specifics
for testing a DSL line.
I have been looking on the web, and can't find what I need.
 
Somewhere there must be documentation on how a line must be balanced,
without stray voltage etc.
 
Any help would be appreciated.

Re: DSL TESTING for Outside Plant



Quoted text here. Click to load it

Your local phone company will know how to do that.



Re: DSL TESTING for Outside Plant


Dana - That really didnt help much,
I work for the local phone company and there is disagreement between
POTS and DS0 techs...

I am still looking for any help with documentation on how a line must
be balanced, without stray voltage etc. any ideas ? - Besides Dana










Quoted text here. Click to load it


Re: DSL TESTING for Outside Plant


Ed,
   You still want a good balance, but the really critical thing is the
Bridge Tap, especially on longer loops (greater than 14K') the drop must be
changed out from the flat copper coated steel for the newer 2 pr 22 gauge
twisted drops with NO splices. You will want to test for BT with a TDR (Time
Domain Reflectometer) I used to use the 3M 965DSP, one of the best meters I
ever used. You will want NO foreign battery on the line, that is nothing
crossed to a working circuit, of course you would see that if you did a
balance test, for the die hards out there a "kick meter" is worthless for
troubleshooting a DSL line.
Another thing is, of course, cable gauge the larger the better, rural areas
typically have 19 or 22 gauge while most cities use 24 or 26 gauge. The
longest DSL line I've gotten to work was at 28.5K' on 22 gauge at 1.2MB/Sec
(download) Temperature is also a factor the colder the cable the least cable
resistance, so if your cable is buried that is much better than say an
aerial cable in Arizona.
My person opinion is the DSL tech is a better cable tech than any DSO tech.
Now another problem is the BT in peoples homes/businesses. I think a
filter/splitter and the NI is required, especially on long loops, why go to
all the other trouble to fix the "plant" when the wiring in peoples homes is
"sub par" use at least Cat3 wiring, home run to the NI and use a filter at
the NI and you will get the best speed and line quality possible.
One last thing, if you live in some of the larger cities you are probably
still using 24/26g lead cable, if you can "cut" the sub to a newer pic cable
preferably jelly filled vs aircore, you will get a better signal.
There is much more on this subject, but these are the simple things you can
do.
Steve_retired telco ds0/ds1

Quoted text here. Click to load it



Re: DSL TESTING for Outside Plant


Ed,

By stray voltage can I assume you mean interference from power lines,
machinery, etc?

ed wrote:
Quoted text here. Click to load it


Re: DSL TESTING for Outside Plant



Quoted text here. Click to load it

I work for a rural telco, and we pretty much get to do it all.

Quoted text here. Click to load it

Bellcore/Telecordia docs are usually pretty good.
Also a web search via google will bring up hits on documents from the bigger
bells like SBC and Qwest, on their testing specs.
And I think you will have the fight between inside and oustide plant guys,
even if you find the documentation you are looking for. I am surprised you
company does not have specs they go by.
Quoted text here. Click to load it



Site Timeline