DSL network facts and figures

Discussion in 'Networking, Telephony & Internet' started by caspian, Jan 3, 2011.

  1. caspian

    caspian Member

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    Kind of bored at work at the moment so I started mining some DSL network stats I found interesting.

    Number of active services - ~3,300,000
    Number of active DSLAMs - 15,768 (plus another 1,377 dedicated network hubs)
    Least customers on a single DSLAM - 1
    Most customers on a single DSLAM - 2,148

    Smallest DSLAM in the network - the Extel LL-ADSL C8/R8-AS, 8 customers maximum
    Largest DSLAM in the network - the NEC AM31, 2304 customers fully equipped

    Some of the smallest DSLAMs are fed by a single 2Mbps link.
    The largest has multiple gigabit links available (although in practice they only need a tiny fraction of that)
    33.3% of the network runs on what can be characterised as "low bandwidth" links, ie 2-16Mbps. The remainder is a breakdown of ATM STM-1, gigabit fibre, and EoSDH software configurable links via ad/dropmux as required.

    The network is comprised of the following hardware:
    Alcatel - 69.8%
    NEC - 29.2%
    Extel - 1%

    66.7% of the network is ADSL capable. The ADSL1-only equipment can be so for a number of reasons, including older model electronics, insufficient bandwidth to offer high speed services, or locking to ADSL1 in software due to technical reasons.

    Some of the larger ISPs run around 6-700Mbps traffic across a balanced redundant gateway pair per state.


    Click to view full size!


    The smaller ones… are a bit smaller than that! (yes, that’s the *national* feed for one ISP.)


    Click to view full size!
     
  2. evilasdeath

    evilasdeath Member

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    I take it this is only Telstra and Telstra wholesale ISPs, as i know there are many Ericsson and Huawei DSLAMs out in the field.
     
  3. Linkin

    Linkin Member

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    It's not our fault ISP's only offer 1mbps upload speeds :upset:
     
  4. evilasdeath

    evilasdeath Member

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    Be interesting to know if this covers consumer and business customers because you see much of the traffic is during peak periods.

    I take it these are taken as interconnects between Telstra and ISP X, and as such all traffic types going out to that ISP even traffic that goes locally on-net.
     
  5. BuuBox

    BuuBox Member

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    Interesting figures. The small ISP mustn't have many customers... :lol:
     
  6. fR33z3

    fR33z3 Member

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    love seeing cacti gettin some big city use.
     
  7. Primüs

    Primüs Member

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    What makes you say it's cacti? The layout of the text actually suggests to me it's not, as last time i used cacti it didn't look like that as such.

    Some interesting notes, and definitely would only extend to a limited number of services, as Telstra never really kept record of the DSLAMs one of my old companies was using (brand, throughputs etc) they could keep customer numbers but only because of the fact that Telstra had to jumper them over, thats all they really had to go on.
     
  8. roweysvn

    roweysvn Member

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    What do you do for a crust, caspian? That's some pretty interesting stuff
     
  9. Primüs

    Primüs Member

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    He works for "Telstra" (quoted as it could be Telstra, Telstra Wholesale, Bigpond (possibly more) or contracting through another company to any of the above), im pretty sure in the NOC, or something similar. In any case, Telstra related, and very broad network access it appears.
     
  10. cvidler

    cvidler Member

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    Agreed, it's using RRDtool (the same graphing engine that Cacti uses), but otherwise looks different to me.
     
  11. martino

    martino Member

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    Thanks for posting the stats.

    I'm a big fan of those BRAS/IGR traffic monitoring pages. It is RRDTool as cvidler mentioned.

    A couple more for the Telstra network:

    Installed ADSL2+ Ports : ~3500000
    Installed ADSL1 Ports : ~2133000
    Total installed ADSL Ports : ~5612000

    IMHO we need some gear porn shots to go with the stats ;)
     
  12. evilasdeath

    evilasdeath Member

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    RDDtool is just a graphing tool, it takes raw data and turned it into a graph, you can even do it from a script if you got the brains.

    And you can make it look how you want with a bit of messing around front ends like cacti just make is easy
     
  13. OP
    OP
    caspian

    caspian Member

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    pretty much correct, although ask me again next week. ;)

    if anyone has any questions throw them up, but I reserve the right to answer depending on sensitivity.
     
  14. roweysvn

    roweysvn Member

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    Thanks for the info!

    What kinda of work do you do that gives you access to this kind of information? Are you a network engineer or something?
     
  15. OP
    OP
    caspian

    caspian Member

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    I work across several roles at the moment. my primary expertise is in DSL and FTTP network engineering and level 3 assurance, but I also work with switching and transmission technologies, do some network (re)design stuff (mostly where the original design was bollocksed up), and some server assurance work.

    most of the people in my team are fairly broadly experienced, but everyone has a couple of technologies they are experts in.
     
  16. ewok85

    ewok85 Member

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    The irony being that if they setup a decent legal way to provide timely access to this stuff people would jump all over it :rolleyes:

    Nice graphs btw, seen a few of those before and it can be surprising just how little bandwidth some things have access to.
     
  17. OP
    OP
    caspian

    caspian Member

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    along with that would be the requirement for the pricing to be reasonable, a concept that a lot of media distributors appear to struggle with.

    I find that most people tend to vastly overestimate the amount of bandwidth actually required, because they base their estimates on their own usage patterns. given the only people who tend to have this sort of discussion tend to be high bandwidth users, that skews the estimates significantly.

    I've seen sites with multiple hundreds of users hanging off an 8Mbps link with zero complaints - and the reason for that is that the link never even goes *close* to saturating.

    a significant chunk of online traffic is P2P and streaming video, but the numbers suggest that it's a tiny proportion of the overall user base generating a very disproportionate amount of that traffic.
     
  18. cvidler

    cvidler Member

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    Well said. However I'd hate to sign up to that 'small ISP' in the OP.
     
  19. Primüs

    Primüs Member

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    Agree completely, ISP i worked for provided a whole town (3 DSLAMs worth, ADSL2+ with at least 500 on each, one up to like 1500) on a single 20mbit link. Eventually it did get saturated, especially when retail department started attracting leechers with high download, low cost plans, but still ran smooth enough that way for a decent amount of time, with bandwidth to spare.

    The whole ISP would only utilise 150-250mbit nationally (not including any special peering) depending on the time of day. If they were to buy a mbit for every sold mbit i.e. they had a 1:1 contention ratio, the link would be at the 10's of gbits in capacity at least, with like a <1% utilisation.

    Edit: You changing jobs caspian? Or are you referring to some interesting internal Telstra re-work? :p
     
  20. ewok85

    ewok85 Member

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    When you consider until recently ADSL was only up to 1.5mbit, a 6mbit connection would have been fine for hundreds of users.
     

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