[j-nsp] cable modem/dsl/ftth bandwidth limiting

[Chris Evans]

Okay that makes more sense.  So both sides technically probably do it??
For upstream the local customer device would limit. Then downstream the
bras would do it.

Still,  can someone answer if it's shaping or policing?
On Jun 19, 2012 4:55 PM, "Chris Kawchuk" <juniperdude at gmail.com> wrote:

> Layer-2 Cable is done at a BRAS (running in DHCP mode). Layer-3 Cable
> Plants shape at the CMTS.
>
> Layer-2 Optical/GPON/FTTH can be done at a BRAS (if DHCP or PPP), or can
> be done at the head end GPON device; assuming the GPON is reasonably
> 'smart', and understands each subscriber and their associated consumer
> profiles.
>
> Think VoIP. Need to shape from the network-side before it hits the
> last-mile, so that any SIP/IAD traffic (for a CPE device with a built-in
> IAD) never gets dropped as well. Toss IPTV into the mix, and yes,
> QoS/Shaping must happen prior to the last-mile. (unless you like pixelated
> TV when your bittorrent client is also going full blast =)..)
>
> Remember that Authentication also needs to happen (who's allowed on the
> network, either by PPP l/p or DHCP Mac); as well as traffic counters, so
> that those who do metered--billing (i.e. Australia) can get per-subscriber
> utilization. So, whichever device is holding the "next hop" gateway IP for
> the subscriber is also the device that is doing the downstream shaping; so
> that the utilization counters match what the subscriber has actually used.
>
> - CK.
>
>
> On 2012-06-20, at 6:46 AM, Chris Evans wrote:
>
> cable and ftth
>
>
>