reply to xsbell
Re: Use someone else's infrastructure, promises worthless
said by xsbell:I am referring to DSLAM uplinks - calling it "backhaul" is fairly common. (indeed, if you look at the presentation I refer to, even Sky/Easynet call it "backhaul")
I highly doubt it has anything to do with transit (what you call backhaul, unless you're talking about DSLAM uplinks), as it is pretty inexpensive and easy to get at any exchange/carrier hotel, the problem will always be at the last mile (DSLAM uplink(s)).
said by xsbell:You seem to be "flying off the handle" without properly digesting what I said. I said "the copper lines from the exchange/DSLAM to the home" - i.e. the local loop - would never be congested, because that's the nature of the beast (there are dedicated connections between the DSLAM and each customer - from the DSLAM upwards it may well not be dedicated).
You obviously have no idea what you're talking about if you think that there won't be any congestion at the SLAM. And what does the ADSL2 standard have to do with this?
said by xsbell:Very unlikely - this presentation from several years ago, when they bought the ISP that brought them into the broadband business, suggests it has been all-IP since at least 2004.
Sky are still probably using legacy DSLAMs fed with slow ATM links. It's time for them to upgrade and switch to the Ethernet aggregated era.
Since then they've started to move away from the old Easynet network (they sold the company off a few years ago but kept the DSL access parts) and have since embarked on a programme of replacing the Easynet era DSLAMs with something even newer.
As far as I know it's only the incumbent telco (BT) who is still operating an ATM-based DSL network and even that is rapidly being replaced.
I would suggest that you refrain from doubting the knowledge of others unless you get your own facts straight.