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Acanac PN
Acanac Support
Premium
join:2008-10-27
Montreal, QC
1 edit | reply to e94mli
Re: PPPoE session from Montreal terminating in Toronto???
Hi,
I checked your file. You are currently on interleaved profile - more stable with error corrections but with higher ping responses.
Generally, IF the profile was set to AL1 (Fast Path) the pings would be lower.
Bell adjusts these DSL profiles to provide stable connections, most of the time adequately, but sometimes there is a room for improvements.
However, after some recent experience, I found many new things regarding this Fast Path stuff.
They are just for your technical information, not officially stated by Acanac Inc by Bell or any other company
o The request switching to fast path (Al1) once created by support people is not always further processed or even answered (by Bell). Simple reason is - according to some people, customer has already stable and working "up to 5M" service. Why to change the things if they work ? This is a ticketing system and we are talking about "Troubles".
o Wholesaler DSL ISPs could forward (like trouble tickets), but not force such changes to be made for standard home accounts unless some particular rules they have established with copper pairs network owner (bell)
o Currently, you are, say on Interleaved (al2) 6M-download setting profile. It may be reduced to 5M at any time, especially when Fast Path request is made
o Al2 to Al1 means Noise margins go lower, occ% go higher, The upstream could start caping. Line is more vulnerable and some disconnects may occur.
o Of course, your Internet would be more "responsive" and "good feeling" if you are on Fast Path. But when it starts disconnecting (some cases I've seen), then whole request needs to go backwards and the customer ends with even lower settings than initial ones.
o There are many so called "IKNS" remotes (or something like this) that give strange stats (always 6db noise margin US) and force Interleave connection with some modems. I don't know why that happens, maybe they are optimized for ADSL2+ (which is Interleave by default) ? Anyway, they are tricky. Unfortunately, only few people know what I am talking about and even fewer could adjust optimal profile settings vs. modem selection in such configurations.
Other ping-related stuff:
Longer line distance to CO = attenuation and ping
Different modems, routers, PC, software could give different ping responses.
PPPoE and internal network routing structure could give you some ping difference but usually is not so big.
In Montreal, I've seen many different average DSL pings.
26ms or 150ms - to same server NY.
A 26ms @ Acanac DSL line tested with different PPPoE logins (Vif, Sympatico, Teksavvy, Acanac) shows almost the same typical pings. Slower line may show some difference, but it is less likely to have 50ms vs 150ms only by changing PPPoE.
You could tell me if you want this Fast Path challenge - you may go down from 6M profile to 5M as a side effect.
Currently, your DSL stats look like this: Al2 6000/512 att 3/9db
I am afraid, if you are on IKNS server it may be difficult to improve your service.
Please, send me another message or just write a request to support@acanac.com with Fast Path note. Then, send me the ticket number, I will follow up.
Thanks | |
e94mli
join:2009-04-07
 ·Acanac
 ·Videotron
| If I understand you correctly it is normal for the session to terminate in Toronto. I guess it doesn't make a huge difference when interleaving is active, at least if it has high interleaving depth, but it makes a difference. A return trip Montreal-Toronto should be about 10 ms and adsl with interleaving adds about 40ms. In the case of accessing something in locally in Montreal the Toronto trip makes a difference since it might add up to 20ms, but it doesn't make up for a 100ms difference as you say.
Going fast path versus interleaving is always a trade off. Also the interleaving depth is something to consider. For a normal Internet access pack errors aren't that critical and it can actually benefit in terms of speed even with a higher error rate since a lower delay might go easier on tcp. For a multicasted tv service packet errors are a disaster and a high interleaving is therefore a must. So what I'm saying is that in my case fast path would be worth the risk. If you don't mind changing it I would want to give it a try.
Except for the somewhat high delay the connections has been working perfectly after the Bell "miss configuration" was sorted out. Thanks for the hard work of keeping us happy.
Mikael | |
Acanac PN
Acanac Support
Premium
join:2008-10-27
Montreal, QC
| BTW, I saw on one new activation in Montreal - friend of mine who is Acanac user, the technician logged with his PPPoE and the ping to NY was 28ms, Then he did the same test with customer's PPPoE (Acanac) - it showed exactly 28ms, so I dont believe the PPPoE itself makes difference.
Let me create a fast path query for you.
Note - the upstream shows 512 not 800 but you are very close to CO. It could be an IKNS one.
Thanks | |
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