symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality]

Sat Feb 28 14:19:09 UTC 2015

WiFi also has 50% overhead, so cut all modulation rates in half. That 300 meg modulation under the best conditions only does 150 megabit aggregate. 

The problem with WiFi is that IEEE keeps rolling out larger and larger channels when they're not even usable due to interference. IEEE needs to implement AP syncing and *SMALLER* channels. let hte AP dynamically control the size of the channel as needed. Only have a 25 meg Internet service? Use a 5 MHz channel, not 160 MHz. 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

----- Original Message -----

From: "Philip Dorr" <tagno25 at gmail.com> 
To: "Miles Fidelman" <mfidelman at meetinghouse.net> 
Cc: nanog at nanog.org 
Sent: Friday, February 27, 2015 11:15:17 PM 
Subject: Re: symmetric vs. asymmetric [was: Verizon Policy Statement on Net Neutrality] 

On Feb 27, 2015 6:48 PM, "Miles Fidelman" <mfidelman at meetinghouse.net> 
wrote: 
> 
> Jack Bates wrote: 
>> 
>> On 2/27/2015 2:47 PM, Miles Fidelman wrote: 
>>> 
>>> Folks, 
>>> 
>>> Let's not go overboard here. Can we remember that most corporate and 
campus (and, for that matter home) networks are symmetric, at least at the 
edges. Personally, I figure that by deploying PON, the major carriers were 
just asking for trouble down the line. It's not like carrier-grade gigE 
switches are that much more expensive than PON gear. 
>>> 
>> 
>> I'll disagree on the home part. I doubt that most homes are symmetric. 
> 
> 
> Just to be clear - I'm talking about the local switch/router sitting on a 
home network, not the connection to the outside world. Last time I looked, 
commodity gigE switches were symmetric - good for network attached storage, 
media servers, that sort of thing. (Come to think of it, though, I've 
never paid attention to whether the WiFi side is symmetric.) 

Commodity switches are symmetric for multiple reasons, but the biggest is 
probably because a server could be on any port and a client on any other 
port. 

WiFi has two separate data rate selections. The download could be at 
300mbps and the upload only be at 1mbps. Or even the other way. WiFi is 
also half-duplex, so if the data rate is 300mbps, then the maximum you 
should expect is 150mbps. 