Quote:
Originally Posted by Ignitionnet
When was the last time your downstream channels dropped to 64QAM?
If you were to say have a huge burst of noise in the middle of an upstream channel that produced a negative SNR would it be able to adapt?
A single narrowband burst of noise will cause a loss of 50% of the capacity of an upstream channel. On xDSL this would be a far smaller effect as it uses DMT.
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The technical differences between the two doesn't necessarily make one "better" or "worse". Yes, a single fault can affect more customers but likewise that means more customers can be serviced with a single fault tech. I get what you're saying, its resilience isn't quite at the level of ADSL's but even with my super dodgy ADSL line, I rarely seen the sync speeds drop substantially in the name of stability, rather it tended to just die and spend hours rebooting. Then when the fault was actually fixed, convincing it to ramp back up to its ideal sync rate was a nightmare as well.
Quote:
Originally Posted by Ignitionnet
Your 'sync rate' declines it just isn't displayed. The added bonus is of course that impediments anywhere on the node can cause it to drop as, while you do have coax not twisted pair, you are also on a shared access segment with however many other hundred people.
Cable has its own set of issues. xDSL was built to run on unshielded twisted pairs in an unpleasant environment. Cable relies on being a closed network with constant maintenance to remove ingress.
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Certainly, however both technologies spread many customers over shared infrastructure. I'm not really sure what you're trying to say about being on a shared segment, when both do this? Yeah your coax is shared with others whereas (I believe) your BT line goes into a cab by itself but as I mentioned earlier, the pro/con divide there means if there's a fault, it takes longer to get the BT line fixed than the Virgin Coax (or has been in my experience).
I think what I'm trying to understand is why you'd claim that ADSL's technology is better, if that was the case then why wouldn't Virgin just deploy ADSL instead of Cable?