Cable Operator List

Scott Helms khelms at zcorum.com
Tue Feb 2 18:49:36 UTC 2016


On Tue, Feb 2, 2016 at 1:24 PM, Colton Conor <colton.conor at gmail.com> wrote:

> Yes, we are in the USA. So based on everyones recommendations, I am going
> to stay far away from EURODOCSIS. I was told be a vendor that Arris and
> other USA FCC certified cable modems could easily be flashed to EURODOCIS
> mode, so I did not think the CPE side was that big of a deal (is that even
> true). I was not aware that there were so many differences besides just the
> channel width.
>

I wish this were the case, it would make my life easier.  The problem is
that there is a diplex filter that prevents the upstream burst from being
heard by the downstream receiver and for cost purposes all the D3 and
earlier modems have fixed filters.  What that means is that a EuroDOCSIS
modem can (sometimes) be flashed to use 6MHz channels, but the reverse is
NOT true.  In any case we don't recommend using Euro modems that are
flashed to US standards in production (nor do the vendors) because you'll
see much more upstream leakage.


>
> So, assuming we are talking about DOCSIS only (and not EURODOCSIS), what
> do you recommend? I like the idea of being able to upgrade to 3.1, but not
> sure if there are any small systems capable of this? By small I mean
> something that could feed less than 100 units, and be economical to do.
> Cable has the advantage of cheap modems, so it's really the CMTS side.
>

In that case I'd definitely go with a remote MAC+PHY.  That's the only way
you're going to get a good price point and decent performance unless you
want to use the secondary market, which actually isn't a bad idea right
now.  A used 7225 with 8x8 blades is pretty cheap, but it's centralized
CMTS that would cover ~3k subs.

>
> Please remember I am only interested in data internet services over this
> plant. Something that works for garden style layouts where I can bring
> fiber or coaxial to the side of a garden townhome that has between 4 to 16
> units inside of it. The reason I requested a harden outdoor unit is that
> most all of the garden style properties have both the phone
> and coaxial drops on the outside of the building. There is no central
> closet or room. Plus we are in the south, so hardened for the
> heat exposure makes sense.
>
> A remote MAC-PHY (or pre remote MAC-PHY, ala mini CMTS) sounds like what
> I want. I will check into Huawei and Gainspeed. Who else makes these?
>

In no particular order, Arris is or will be, Teleste (Euro vendor trying to
break into the US),  Sumavision, Altera, and ton more I can't remember.
Come to one of the SCTE shows (it's in Philadelphia this year) if you want
to be deluged with them :)

>
>
>
>
>
> On Tue, Feb 2, 2016 at 11:24 AM, Scott Helms <khelms at zcorum.com> wrote:
>
>> Nick,
>>
>> Absolutely, if your plant is in Europe or one of the other areas (lots of
>> Africa and the middle East is like that) that adopted EuroDOCSIS I'd agree
>> wholeheartedly.  I didn't see Colton say where they're located, but all
>> North America is the US flavor so that's what I assume on NANOG.
>>
>> That being said, the best thing that seldom gets mentioned about D3.1 is
>> getting us to unified channelization.
>> Scott Helms wrote:
>> > That very small upside for an extreme downside.Trying to hire someone
>> > to work on your system with Euro channelization, not to mention buying
>> > amplifiers and passives is a huge PITA.
>>
>> ... if your plant is in the US.
>>
>> > I have customers in Europe who
>> > decided to do US DOCSIS and they universally wish they had used the
>> > local "flavor".
>>
>> as you say, eurodocsis works well in europe.
>>
>> 3.1 will be a major improvement when it materialises.
>>
>> Nick
>>
>
>


More information about the NANOG mailing list