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Originally Posted by Chrysalis
for carl j to get 20mbit on a 1.4km line is very unusual and is not the norm but of course it is possible, BTs local loop network seems to be of very inconsistent quality, what people should be aware of tho his direct route is just over half a km.
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A lovely way to put a negative spin on the fact my line is very good and I get 20Mbit at 1.4km
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Some lines have alimiumn others have thin copper, some have poor joints, some have poor exchange equipment, some have interference all of which will reduce performance.
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Some have none of the above
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On my line I observed the following behaviour to give you an idea of how exchange equipment can affect synch speed.
Initially 7000kbit on 6db noise margin, fast mode noise bursts during office hours.
After lift and shift (move to diff line card port but same dslam) 6400kbit synch speed same noise bursts.
After cease and reprovide (different dslam) 6400kbit synch speed, much reduced upstream synch strength (down from over 1000kbit to 700kbit introducing lower noise margin and errors on upstream) and noise bursts now happen at weekends as well but still daytime only.
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That's you, you're one of over 8 million DSL connections in the UK on one of over 5,000 enabled exchanges
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As I understand it plugging into a dslam isnt like plugging in a network cable they have to attach the naked wires and judging from my experience its entirely possible to get a poor connection. My attenuation also changed every time they moved me around in the exchange as well. Currently my upstream attenuation is lower then before with the reduced upstream performance which doesnt make sense at all.
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That'd be the jumpering you're referring to, which is generally very good as it's done with precision tools. Not many links done with a soldering iron anymore but yes they are done occasionally in old exchanges. Though it's nicely arranged you have a copper connection with cable too, albeit a coax cable which is shielded. You do get the noise of both youself and anyone else who shares that combined link to the fibre node after all as they are combined, while with DSL you have a dedicated cable and bandwidth right to the DSLAM.
Of course you didn't mention that in your DSL bashing.
Please do carry on. DSL bad, cable good.
---------- Post added at 20:37 ---------- Previous post was at 20:33 ----------
Quote:
Originally Posted by Paul
Line distance is only one factor in the speed issue (as a SKY employee I'm sure you know this already) and things like exchange equipment, quality of line, quality of equipment on the line and congestion all play a part in ADSL speeds.
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Sky is capitals now? News to me.
Anyway yes I'm aware of this however on LLU the quality of the equipment at the exchange is normally fairly well known, and congestion on Sky LLU, unlike cable, doesn't happen