[126179] in North American Network Operators' Group
Re: Emulating ADSL bandwidth shaping
daemon@ATHENA.MIT.EDU (Scott Weeks)
Tue May 4 17:00:36 2010
Date: Tue, 4 May 2010 14:00:00 -0700
From: "Scott Weeks" <surfer@mauigateway.com>
To: <nanog@nanog.org>
Reply-To: surfer@mauigateway.com
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
--- swmike@swm.pp.se wrote:
From: Mikael Abrahamsson <swmike@swm.pp.se>
On Tue, 4 May 2010, Scott Weeks wrote:
> "Interleaved" turned on to correct errors. This adds ~25msec between
> the CPE and the nearest router. Sometimes folks ask for it to be
> changed to "Fast". We explain that errors may cause resyncs to happen
> and then make the change if the customer still wants it. That takes the
: Never seen it cause resyncs, but that might happen, dunno.
It definitely causes the DSLAM port to resync sometimes.
: It is usually settable to 1,4,16 ms in each direction, so
: 25ms is not a "law of nature", it's just the default 16/4 ms
: downstream/upstream interleaving and then the added coding delay.
We have to set it high because of the OSP. It goes through jungles. Literally. ;-) Some areas get 25-30mph winds every day with 300-400 inches of rain a year.
http://www.nature.org/wherewework/northamerica/states/hawaii/preserves/art2363.html
http://farm5.static.flickr.com/4054/4303747828_ce95aea13d.jpg
scott
