Will again need to report to bt and get a broadband engineer sent out, i thought it was an oscillator of some sort , Would be nice to get this fixed, although would be nice to have a decent engineer to find the fault/s Shouldn't the AC balance be affected more than that though? What does crosstalk affect the most? high number of errors seem to be between 23.30-5-30, during the middle of the night?
<jokingly> That's like asking, '
What's the meaning of life' and getting a satisfactory answer in a tiny box with a smiley at the end ?
What I'm trying to say is ….. network fault conditions display varying conditions, dependant on the severity of the fault or faults. There is no one-cap-fits-all answer.
For example, if the circuit portrayed on this thread (With the audible noise track), has a weakened 'Insulation resistance', then it may not be enough to affect the AC Balance test reading but sufficient enough to introduce coupled noise ?? For info ….. PSTN frequencies should expect a IR reading of >1Meg ……… and Digital frequencies >5Meg.
Only this week, I was on a fault with a colleague that had us both baffled by the results and the end-fix (Always learning in this game).
The PQT showed a perfect individual leg-balance (Equal ohms readings for both wires from the house to the Exchange).
The AC-B was 69dB, (Anything over 60dB is more than adequate for digital services). The JDSU synched up and had data-flow with no errors (Even when performing a QLT test at the same time). The icing on the cake was that the EU's SKY Router also synched up and acquired a PPP Session.
Brilliant, we thought. But a co-op with SKY revealed he couldn't 'see us' in synch. He remotely dropped the port to satisfy us it was on the correct Exchange mapping, and it subsequently dropped out and instantly re-synched again. He still couldn't 'see' the router though.
Long story short, it required a new E-side to resolve the matter. Even though me and my mate were adamant it would need a new port as it was suffering under real-life attenuation. Especially when
all our testers were telling us it was a decent pair of wires ??
The SKY Tier 2 support was very good (They always are TBH), and said he'd seen this before on umpteen occasions, and he termed the fault condition as, 'Split Pair Dis'. Not a term I have ever come across in 30yrs ??!! But, he was right and we were wrong.