Re: Broadband truth in advertising, redux

[David Farber <dave () farber net>]

Begin forwarded message:

From: Rahul Tongia <tongia.cmu () gmail com>
Date: February 10, 2010 9:12:51 AM EST
To: dave () farber net
Cc: ip <ip () v2 listbox com>
Subject: Re: [IP] Re: Broadband truth in advertising, redux

Dave,

While we're at the issue of fundamentals, I'd love for a quantification of the costs of *mobility* (hi speed vehicular 
soft handoff). One number I got from a respected source was 30%; another person said higher.  If we don't design 
everything for such, and developing countries could happily suffice with *portability* that should lower costs. More 
importantly, it could open the way for alternative technologies and designs than today.

Thanks,

Rahul

On Wed, Feb 10, 2010 at 5:02 AM, David Farber <dave () farber net> wrote:


Begin forwarded message:

From: "David P. Reed" <dpreed () reed com>
Date: February 9, 2010 6:20:11 PM EST
To: dave () farber net
Cc: ip <ip () v2 listbox com>
Subject: Re: [IP] Re: Broadband truth in advertising, redux

I'm going to make one more try.   Can any of these experts please *quantify* these enormous costs incurred by 
cellphones that happen to be in the vicinity of a cell tower?  What *percentage* of capacity does a non-communicating 
cellphone occupy when it is not currently transmitting or receiving?

In my *expert* opinion, these are insignificant, immaterial costs.  And rightly so, since the cellular infrastructure 
is engineered to minimize such costs!

This is essentially nonsense.

On 02/09/2010 05:49 PM, Dave Farber wrote:
> Begin forwarded message:
>
> > From: Alex French <alex () evilal com>
> > Date: February 9, 2010 3:49:43 PM EST
> > To: dave () farber net
> >
> > Subject: Re: [IP] Re: Broadband truth in advertising, redux
> >
> > > On 02/08/2010 02:14 PM, Brett Glass wrote:
> > > > P.S. -- Oh, and Karl, lest I forget to mention it, any continuous
> > > > connection between a cell site and a client incurs significant overhead.
> > > > The cell has to reserve codes (CDMA), time slots (TDMA), or channels
> > > > (OFDM) for any client with which it has established a conversation, and
> > > > can't continuously do this for every cell phone in the vicinity.
> >
> > Dave,
> >
> > It's worth mentioning that this applies to wired broadband too; every
> > connection means a session allocated on an ISP BAS, and equipment is
> > usually spec-ed for X simultaneous PPPoE connections; in fact, Cisco
> > charge significant license fees to ISPs based on the number of
> > concurrent connections (active or not).
> >
> > --
> > Alex
> Archives      

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