| Statement quote:
All DSL speeds are "up to" best effort...
I don't think that applies to DSL speeds only, like that statement sort of suggests, but applies to cable as well. |
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 pb5kCan't TriforcePremium
join:2005-11-16
Glendale, AZ | I agree, any residential broadband is considered by the provider to be "best effort", though that's not what they emphasize in their advertising. 
If there is a residential provider that guarantees a level of service, I'd like to know who they are.
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"When they call the roll in the Senate, the Senators do not know whether to answer 'Present' or 'Not guilty.'" --
Theodore Roosevelt |
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 djrobx
join:2000-05-31
Valencia, CA
kudos:1
 ·Verizon Wireless..
 ·RoadRunner Cable
 ·AT&T U-Verse
 ·VOIPo
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| reply to Turbocpe
quote:
I don't think that applies to DSL speeds only, like that statement sort of suggests, but applies to cable as well.
But with DSL it has a different meaning. SBC/AT&T, in particular, advertises "up to" speed tiers that you may be able to order but not necessarily acheive the top end of due to line conditions.
In other words, on DSL you might order "Up To 1.5mbps" and end up with a 768kbps sync rate that you can never exceed because you are too far from the CO or RT. Cable doesn't have this limitation so it does not apply. Either you get full service or you don't.
This is different from the other part of "best effort" speeds which do apply to all internet providers, which includes protocol overhead, oversold bandwidth, and general networking stuff that takes away from acheiving maximum theoretical throughput.
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Laser eye surgery rocks! I love frickin' laser beams. |
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| I now can see that point, but not sure if it generally is seen that way. Personally that is not how I read the statement as, and I have DSL and cable service myself.
In my case, with Qwest, the qualifier webpage appears to do a fairly good job of telling you what speeds your address or phone number can qualify for. I've heard many times where the local technicians, if possible, will see that you get that speed you signed up for if it's easily within their control. |
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 en102Canadian, eh?
join:2001-01-26
Valencia, CA
3 edits | reply to djrobx
Yup...
They have to specify
384-1500/128-384 kbps
1500-3000/384-512-384 kbps
3000-6000/512-768 kbps
Don't forget to note... at&t lines also don't include overhead, and that's actually sync rate, not user end rate.
E.g. my sync rate is 2496kbps / 512kbps, and throughput is
just over 2Mbps down, 400kbps up.
Line Status: Up Collisions: 0 Rx Pkts: 604337
Upstream Speed: 512 kbps CPU Load = 2.64%
Downstream Speed: 2496 kbps
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Canada = Hollywood North |
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 myosh
join:2001-05-03
Cupertino, CA
 ·Pacific Bell - SBC
·Comcast Formerl..
1 edit | reply to djrobx
said by djrobx:But with DSL it has a different meaning. SBC/AT&T, in particular, advertises "up to" speed tiers that you may be able to order but not necessarily acheive the top end of due to line conditions. When I signed up a couple of years ago, the Pro package was advertised as 1.5 to 3 Mbps download and 384 to 512 Kbps upload. In other words, packages had a minimum speed as well as a maximum speed but it looks like AT&T changed that.
Edit: My sync rate is 3008/512 and I consistently get 2500/420
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| reply to en102
said by en102:Don't forget to note... at&t lines also don't include overhead, and that's actually sync rate, not user end rate. That's true for the majority of the providers, DSL or cable. While DSL has a sync rate, and you can't exceed or see that speed, cable has speed caps that also mean you cannot exceed or see those speeds. Both DSL and cable have overhead, though DSL does have more.
I believe there was/is atleast one ISP that overcaps, which sets your modem's speed cap slightly higher than the advertised speed, to help compensate for overhead, thus allowing you to see more of the advertised speed. I thought it was Charter. |
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djrobx
join:2000-05-31
Valencia, CA
kudos:1 Reviews:
·Verizon Wireless..
·RoadRunner Cable
·AT&T U-Verse
·VOIPo
·PHONE POWER
1 edit | quote:
I believe there was/is atleast one ISP that overcaps, which sets your modem's speed cap slightly higher than the advertised speed, to help compensate for overhead, thus allowing you to see more of the advertised speed. I thought it was Charter.
Verizon is known to over-cap their DSL to compensate for ATM overhead. Comcast seems to over-cap their download speeds by 10% (e.g. 6600kbps cap on 6mbps service), although its harder to determine now with PowerBoost.
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Laser eye surgery rocks! I love frickin' laser beams. |
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