mediatechnology wrote: ↑Sun Nov 24, 2019 10:22 am
If you have DSL over POTS then you have a "wet" pair. (Electrically wet.)
According to ATT tech not POTS but dry pair... I told him I was measuring 35V off hook, and he said it should be 0V.
In strange telco-talk your "wet" pair probably wasn't "dry" (in terms of moisture) which caused a longitudinal imbalance.
he said he found a short to ground on one leg.
You've had a lot of rain recently haven't you?
1" yesterday, but my pecans are puny/stunted from late summer drought.
A wet paper wasp's nest in a terminal reeks havoc.
Or maybe it was hard-shorted.
ding ding ding...
It doesn't take much leakage current at all to imbalance a line.
a couple years ago I had an intermittent imbalance when a squirrel chewed through the insulation up on a pole near my house.
Glad you now have DSL again.
me too... I have become very dependent on web access. Hard to remember how we managed before the WWW.
The last day or two was the first time Spectrum cable (internet only) hasn't dropped offline for several minutes to hours.
I had to have fiber brought in in mid-October which is now my primary carrier.
So now I have fiber (300 MB/s), cable (300 MB/s when it works) and when I'm deep in the weeds a 4G router.
Those few weeks Spectrum was dodgy cost me about $80 in 4G data.
Around here AT&T had stopped checking their copper cables for air pressure loss.
Things may have gotten so bad that they recently sent an air pressure crew to some large trunks a few blocks over.
I hadn't seen those guys in about 3-4 years.
I suspect that they aren't maintaining your copper outside plant either.
probably only as needed... I cleared kudzu that was covering my pole/termination a month before the tree service came through to clean the lines.
My at&t cell phone service comes and goes... I need to find a better carrier or move to a hilltop closer to the interstate,
So a question for our readers:
Why are telephone battery feeds -48V relative to earth?
perhaps carry over from old vacuum tube conventions.
Why do cars no longer have a positive ground chassis?
No sure exactly when they did? Popular auto history says old 6V cars were positive ground and 12V cars were negative ground so that happened mid 50s or so. Also lots of imported cars were positive ground.
I converted my 54 ford from 6V to 12V for hotter spark and better cold cranking. I don't recall any polarity issues, while my stock 6V radio was powered from a DIY 6V tap using a sheetmetal screw into the top of the 12v battery. I guess all the light bulbs don't care, while I had to swap out head lights and tail light bulbs with 12v. My 6v horn was really loud on 12v.
I recall it was always important to know when using jumper cables, because bad things can happen from reverse voltage (I think a common victim from that was the alternator diodes, while 50s cars had generators). Most of the cars I worked on since the 50s were positive voltage wrt to grounded frame that was often the negative supply return to the battery etc... Starter motor only had one positive wire. Return current flowed through motor block to get back to the battery. (I think).
Positive jumper cable to Battery + first then negative jumper cable would clamp to bumper, back when cars had metal bumpers.
This would avoid sparks near the battery that could ignite leaking hydrogen gas. I guess a positive ground car would spark on the bumper connection but not kill anything as long as you don't leave it connected. The violent sparks should be enough to discourage leaving it connected.
JR