[c-ubr] Connect multiple upstreams of a single optical node with the same downstream

[Ben Kirkpatrick]

   I think there are two different ways to do this; the DOCSIS way and the
Cisco way.  The DOCSIS way is to use the cablemodem config file to set the
upstream channel.  You could put residential on one channel and business
on another, or voice, etc.  Your provisioning system makes the
decisions but you can't change (load-balance) them very easily.  The Cisco
way is dynamic and doesn't require the modems to know.  I believe you have
to run something in the 12.2(15)BC series.  All of the modems come up on
the first frequency, but some percentage (configurable) will get a message
to move to the second channel.  I believe Cisco has other strategies as
well, but I didn't see an immediate need for them.  I'll find the docs
later if you're interested, but it will have to wait for coffee. 
   As for the 7114 being able to support two upstreams... I think it
should work _if_ the right IOS version 12.2.15BC can be loaded.  I know
for sure that it works with 7246's with MC-28U.

Hope that helps,
--Ben Kirkpatrick


On Fri, 8 Apr 2005, Yann GAUTERON wrote:

> Dear all,
> 
> I am trying in a lab with a Cisco uBR-7114 router to assign to an HFC 
> node one downstream and two upstreams (on different frequencies). My 
> wish was that with such a configuration the CMTS would assign every 2 CM 
> on one upstream (upstream 0) and every 2 other CM on the second upstream 
> (upstream 1).
> 
> After trials in my lab, I have no success. Do you know if this Cisco uBR 
> can support such a fonctionality ? If yes, do you have an idea how to 
> configure it in order to dynamically assign one upstream (or one 
> frequency, if you prefer) to a modem at the initialization phase ?
> 
> Last question: Would I have the same problem, if I were using uBR7206 
> routers (with MC16C or MC28S cards) ?
> 
> I know it is easy to do it with two different downstreams with a config 
> file assigning the modem one or the other downstream, but I can not 
> realize my idea with one downstream and two upstreams.
> 
> Thank you for your answers,
> Yann Gauteron
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