Re: [Cerowrt-devel] CeroWRT and "FTTN" 50/10 VDSL2 (aka "FIBE")

[Sebastian Moeller <moeller0@gmx.de>]

Hi Michael,


On Jul 2, 2014, at 22:45 , Michael Richardson <mcr@sandelman.ca> wrote:

> 
> Sebastian Moeller <moeller0@gmx.de> wrote:
>> Hi Michael,
> 
>> On Jun 30, 2014, at 17:37 , Michael Richardson <mcr@sandelman.ca> wrote:
> 
>>> 
>>> Sebastian Moeller <moeller0@gmx.de> wrote:
>>>>> Bell Canada and nortel ATM equipment is involved.
>>> 
>>>> Oh, that would be quite interesting vdsl2 and atm at the same
>>>> time. Could you by chance post the status page of your vdsl modem (the
>>>> more detailed the statistics the better)? (Typically vdsl2 should use
>>>> packet transfer mode (PTM) instead of ATM between modem and DSLAM,
>>>> though the DSLAM might still connected to an ATM fabric. It would be
>>>> interesting to measure whether you still "see" the effects of ATM
>>>> encapsulation along your link.
>>> 
>>> I can't say what the VDSL2 interface is, but the backhaul network with Bell
>>> has been historically all nortel passport ATM (with way over buffered LANE).
> 
>> I would be amazed if they would manage to extend the reach of their ATM
>> network while most other telco's seem to be moving away from ATM… Since
>> bell advertises this as a fiber to the cabinet product, my bet is on
> 
> OC192 still counts as fiber :-)

	Interesting pointer, it seems that an oc-192 link could carry atm or ethernet equally well (or even at the same time ;))

> Bell Canada is still very much a Nortel captured company.

	Looking at http://www.wholesale.bell.ca/wavelength-service/ I would say the backbone seems protocol agnostic, so no clear indicator how the dslams are connected upstream.

> 
>> ethernet over fiber from the slam/msan to the core network, but I
>> digress. Not that it matters, only for the modem slam connection one
>> needs to take ATM encapsulation into account for bandwidth shaping
>> purposes. So what is your direct uplink to the slam using PTM or ATM?
> 
> I have no idea and no real way to find out. I'll ask my ISP.

	Some modems have a detailed statistics page that reveals relevant information (then again some modems hide this information (behind obscure links) or do not have them in the first place). Your ISP will know for sure, at least the technicians (not necessarily the first level help-desk personal though). Good luck in finding out.
	Oh theoretically you could try to find out empirically whether you are on an ATM link, but at 50/10 that measurements might take too long to be feasible (that is might require too many data points).

Best Regards
	sebastian


> 
> --
> ]               Never tell me the odds!                 | ipv6 mesh networks [
> ]   Michael Richardson, Sandelman Software Works        | network architect  [
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [
> 
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