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Interleaving
And Latency
(old news - 03:32PM Wednesday Mar 23 2005)
Today's Verizon speed upgrade topic noted that subscribers going to 3mbit can also ask for a "Fast Packet" option, reducing their latency. You can also see an ongoing discussion/argument on Interleaving with Qwest DSL lines prompted by a new subscriber unhappy with their ping time.

For gamers and others that are interested in minimal latency (VOIP users?), perhaps it is time to mention the following resources: BBR Qwest FAQ entry on Interleaving and this descriptive post on Interleaving. The bottom line is: if your ISP is willing and able to disable interleaving for lines low noise enough to support it, it is a Good Thing. Qwest is, so far, uninterested in supporting this configuration request.

Forums » Interleaving
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Maxo
Your tax dollars at work.
Premium,VIP
join:2002-11-04
Tallahassee, FL
clubs:
·Embarq

Sprint

Sprint as well puts all (well, actually most) of their customers on interleave by default no matter what their line stats look like. Newer reps in their tech support department don't even know what fast path or interleave is so if you call up you will get a dumbfounded response. SBC has the right idea with their "ramp up" where it tests your lines and puts it on only when necessary. Unfortunately their script isn't 100% so some customer's get put on it accidentally but a quick call to tech support (assuming you get an agent who knows what you are talking about) or an IM to the right people on these forums will put you where you need to be.
--
"Boys are girls" - Laura Bush
»www.cafepress.com/maxolasersquad

Ark

join:2002-06-08
Hudsonville, MI
·AT&T Midwest

Re: Sprint

Have you see the alternatives, in some Sprint areas, like this one where I got a few friends: »www.cox.com/LasVegas/highspeedin···rred.asp
Interleaved 1.5Mb is much better than a 7.5GB monthly limit!

In SBC/Ameritech land, we have lots of Comcast advertising ("you're not at 3 megs? get a life!") and while their limits are invisible, they are surely a bit higher than 7.5GB.
6.0Mb Fastpath sure is nice. Too bad we have 8 months of snow on the ground with alternating melt/freeze cycles!

Maxo
Your tax dollars at work.
Premium,VIP
join:2002-11-04
Tallahassee, FL
clubs:
·Embarq

Re: Sprint

I agree. I stuck with Sprint for a while because even though the local cable companies blocked ports and did all sorts of weird routing stuff to keep you just browsing and nothing else. But it still stands that they should not interleave you if it's unnecessary.
--
"Boys are girls" - Laura Bush
»www.cafepress.com/maxolasersquad

GlenQuagmire
Giggidy Giggidy Giggidy Goo
Premium
join:2004-02-16
Grand Rapids, MI

Bull S$%t

This is bull. They are doing this is because they do not want to upgrade their network.

TrueAudio
192khz
Premium
join:2002-02-24
Belmont, CA

Wait.. this is broadband .. right?

Should the "Fast Packet" even be an option? Its like ordering a Ferrari with the "Fast acceleration" Package. It should already be fast! Thats why its a Ferrari!

I guess its good news.. to some people. Maybe I'm missing something.
--
www.mtndewbuzz.net
KONG

join:2002-04-05
Tampa, FL


edit:
March 23rd, @05:10PM

Re: Wait.. this is broadband .. right?

Fast past means no interleaving.
This is not exactly the way this works but it will give you the idea.
Interleaving basically does a data check making sure there was minimal or no data loss in the line. When Interleaving is used your ping or latency as they call it will rise. For example Gamby the Gamer Plays on the Im a Camper Counter Strike Server. On fast path with out the corruption checking Gamby pings 45. Now Gamby upgrades dsl and is now placed on Interleaving. Gamby's new ping to the same server is around 100 to 150. Gamby is now so frustrated that he has to lead his shots into the middle of next week to get a hit with the sniper rifle, that he spikes his mouse with extreme prejudice. The mouse bust into many pieces and a splinter takes out Gamby's eye.
All of this could of been avoided if Gamby had a fast path alternative or was not put on Interleave until he complained of data corruption.

djrobx

join:2000-05-31
Valencia, CA
·AT&T U-Verse
·AT&T CallVantage
·Time Warner VOIP
·RoadRunner Cable
·DSL EXTREME


edit:
March 23rd, @05:12PM

Ideally one can have both fast packet and stable, full 3mbps/768kbps rates.

Some people with poor or long lines need to make a choice between low latency and high transfer rates. Gamers will obviously want fast packet. Businesses concerned with stability and users who do lots of transfers should opt for interleave if the fast profile is unstable.
--
\\ROB - a part of the SCB local network

AthlGrond
Premium,MVM
join:2002-04-25
Aurora, CO
·Comcast

See: »DSL FAQ »Latency versus Bandwidth - What is it?

There are various options that DSL providers can implement that can affect latency.

The source of contention with Qwest DSL is that they implement interleave on all of their ADSL lines with no option to modify it. Interleave is a way of correcting for noise induced errors on a DSL circuit. The problem is that interleave adds latency to the connection, which generally is bad for games and (maybe) VOIP.
--
Save the whales. Collect the whole set.

Jerm

join:2000-04-10
Richland, WA


edit:
March 23rd, @05:31PM

Do NOT call it "Fast Packet", the correct term is Fast Path. There is enough confusion about this out there already, please to not add to the hysteria.

This article is also misleading, do not expect Verizon or any telco to be able to set your line to fastpath at the same time you order it! Read on for some more information on my experience with getting interleaving taken off my 3mbit/768 Verizon line.

Around 95% of technicians have no idea what this setting even is, let alone how to go about changing it. After your line is working you can check your signal levels on the modem and request the change to fast path later on. In my case this took about 4 hours worth of my time on the phone with Verizon spread over many phone calls on many different days. Eventually what has to happen is VZ has to have a maintenance control tech at the CO make this configuration change, and this will only only happen M-F 8am-4pm after you have run the gauntlet of being transferred from billing, to technical support, to tech support 2, then finally the big MC.

I tried to put my DSL order in @ 3mbit with fast path to start with. Boy was that a mistake! It just added confusion on the VZ end of things and everything got messed up.

Now that everything is fixed, pings to my gateway (Seattle WA about 200 miles away) went from 30ms down to 12ms with no decrease in speed or stability.

RadioDoc
Sortofadog
Premium,ExMod 2000-03
join:2000-05-11
Chicago, IL
·AT&T Midwest

Re: Please people...

said by Jerm See Profile:

This article is also misleading, do not expect Verizon or any telco to be able to set your line to fastpath at the same time you order it!
SBC/Ameritech used to have interleaving on by default but switched to fastpath as the default at the beginning of September 2000, about the same time they implemented line sharing. They don't go to interleaving unless it's a last resort, which doesn't happen very often. I've got two 6016/608 lines at different locations running just fine on fastpath.

Not sure what Verizon's problem is.
commando

join:2000-06-07
Chicago, IL

Re: Please people...

Oh I remember those days. Pings at 100ms and disconnects at random. The memories...

PliotronX
My Katamari's Bigger Than Your Katamari

join:2000-05-13
Sunland, CA


edit:
March 24th, @12:34AM

Thanks for the info, I would have no qualms moving to SBC territory in that case. That is a much better policy than Qwest's. I believe that ILEC's should take it on a case-by-case basis or if interleaving is their default, they should offer an option to disable it upon request. It's not like the freaking line has to be rewired or five tech support employees and a goat must be sacrificed to the gods of copper. Someone with a device can do it remotely. Ultimately it would be really awesome if the data path setting was left up to the end user (via a telnet to the modem maybe?), but set to default to interleaving so we could avoid this issue altogether.... in my dreams, I know.
bogey780

join:2004-03-19
Covington, LA
Bellsouth is the same. All circuits are on Fast path unless it requires the "noise profile" AKA Interleaved.

Riss_Centaur
Mod'taur - - - - 4 On The Floor.
Premium,MVM,Ex-Mod 2005-07
join:2004-01-20
other
clubs:


edit:
March 23rd, @04:29PM

SBC is Fast....

Over here in SBC/Ameritech land the lines are starting up as Fastpath unless they are so noisy during the rampup they get set to interleaved. Even then a check in with SBC tech support usually get things set back to Fast if the line can hold it.
-Riss
--
I have a plan so cunning you can pin a tail on it and call it a weasel!

adamofwales

join:2004-08-24
Englewood, CO

Qwest DSL

Qwest DSL speed and technology upgrades are slated for 2005.

»www.qwest.com/dsl

DaSneaky1D
one wall to block them all
Premium,MVM
join:2001-03-29
The Lou
·Charter Pipeline

Re: Qwest DSL

said by adamofwales See Profile:

Qwest DSL speed and technology upgrades are slated for 2005.

»www.qwest.com/dsl
Will part of that upgrade allow the option for capable lines to have interleaving turned off?
--
] :: my trivial ramblings :: [

PliotronX
My Katamari's Bigger Than Your Katamari

join:2000-05-13
Sunland, CA

Re: Qwest DSL

I wouldn't bet on it. If you skim one of the threads in this news article, you will observe that Adamofwales seems to have a fetish for interleaving, so he would be the wrong person to ask such a question.

Cyberian75

join:2004-03-16
Beaverton, OR

Verizon

Would I benefit from this "Fast Path" option if I have Verizon make the switch? My latency is around 60-120ms.
--
Michael
FWD #608975
KONG

join:2002-04-05
Tampa, FL

Re: Verizon

If you are on Interleave it should cut your ping buy one half to one third going to Fast Path. That is as long as your line can handle it.

jig

join:2001-01-05
Hacienda Heights, CA

cable too?

is this only an option for dsl based networks, or can cable also benefit from the discussion?

trparky
Bite My Shiny Metal Ass
Premium,MVM
join:2000-05-24
Cleveland, OH
clubs:


edit:
March 23rd, @07:35PM

Re: cable too?

No, in this case, Interleaving adds an extra layer of data recovery/data integrity checks to the ATM Cells that travel on a dirty DSL line.

Because of this extra layer, 100 ms of extra latency is added to your line. The data checks take some time to do.
--
WedgeAntilles250

Tom's Rant

dispatcher21

join:2004-01-22
united state


edit:
March 26th, @06:20AM

Re: cable too?

100ms added? No way. I have Qwest DSL and I ping under 80ms on everything on the west coast, to the Xbox live servers I ping 45ms and 110ms or under for east coast. Now I'm not saying thats the best and I know that interleave adds to it but no way does it add 100ms.

trparky
Bite My Shiny Metal Ass
Premium,MVM
join:2000-05-24
Cleveland, OH
clubs:


edit:
March 26th, @10:52AM

Re: cable too?

I don't know, but back when I was with Earthlink and Covad, Covad's Interleaving added 120 ms to my ping to my gateway. Without Interleaving, it was 20 ms.
--
WedgeAntilles250

Tom's Rant

Bobcat
Volvo sucks
Premium
join:2001-02-04
Bedminster, NJ

Don't you know the terminology?

I would expect DSLR editors to know the correct terminology. It's Fast Path!
barky
Premium
join:2001-03-17
San Diego, CA

Re: Don't you know the terminology?

So far, I've heard "fast packet" and "fast past" today, from this and another thread. Where do people come up with these terms? I've only known "fast path" to be defined by either "fast path" or "interleave off". This is hilarious. I can't believe no one said anything earlier. Ebonics rules.

Swingerhead
Premium
join:2004-04-06
Richmond, VA

edit:
March 24th, @09:05AM

Re: Don't you know the terminology?

N/M
Forums » Interleaving


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