I don't exactly know what's being referenced as the 2+ "network". 2+ is a spec for last mile only. Maybe what's being referenced is the ATM vs. Ethernet network?
TTV customers are on DMT2 or ADSL2+ ports, depending on what's available.
All HD subscribers will have to be on 2+ ports. HD is technically ready-to-go for 95% of subscribers on 2+ ports, in my estimation.
All TTV subscribers are on a different 'network', as I understand it, than regular HSIA subscribers. They use different paths, routers, etc. on the backend, through the Telus network. ATM is being phased out. I don't know if there are plans to move all subscribers to the new network, though I'd imagine eventually.
I'm also imagining there is not a lack of capacity. Capacity to gateways outside Telus' network can be bought at will, and there is plenty of capacity within the network. I imagining speeds are fluctuating for some users because the engineers haven't properly utilized the resources, but that's speculation.
Also clouding the issue is the always present possibility that some users have something wrong with their line. I always recommend calling support, suffering through Tier One

- and getting a service appointment booked if necessary.
I personally haven't noticed any drop in speed, but there are enough users on this forum saying they have had troubles to believe that there have been some snafus. I would not say that it's lack of capacity (TV doesn't take a hell of a lot, in relative terms), but rather engineering problems with the network.
BTW, IANA Network Engineer
