On Dec 20, 2010, at 1:47 PM, Lamar Owen wrote: > On Monday, December 20, 2010 03:44:33 pm Owen DeLong wrote: >> The vast majority of residences are more than 5,000 and a good majority >> are more than 10,000 cable feet from the CO. > >> This means that average DSL speeds are sub-T1. > > FWIW, I'm at 14-15 kilofeet from the CO, and am getting a solid 7Mb/s down > and 512kb/s up. The ISP has three tiers of DSL, and I'm at the lowest (which > is probably the one that will work at my distance). They also provide a 9M > down / 768k up, and a 11M down / 1M up for slightly higher rates. I'm told > that the 11 down/1 up will work up to 12 kilofeet by their engineering. > Those are all still sub-T1 on the uplink and well below normal CMTS service speeds. Low-end CMTS is around 15Mbps/7Mbps.
> I'm running a secondary administrative DSL at my employer's location at the > full 7/.5 rate at a distance of nearly 18 kilofeet, the last 2 kilofeet being > our inside plant of CAT3 CALPETH. That is on a Cisco ADSL WIC in a 2651; > show dsl interface atm0/0 shows a downstream rate of 6.8Mb/s and an upstream > of 640kb/s. Not bad for the distance. Margins are good on both directions, > being 12dB upstream and 8.5dB downstream. > I'm happy for you. The AT&T cable plant in my neighborhood is unable to sustain any better than 1.5mbps/384k on ADSL. > My experience is that the downstream is mildy oversubscribed, and the > upstream less so. > > Their copper in my area is nearly new, they have spent the last five years or > so refreshing and updating their copper outside plant. That helps a lot. It still doesn't compete with CMTS which was my point. Owen
