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Re: Clearwire May Block VoIP Competitors

  • From: Jared Mauch
  • Date: Thu Mar 31 10:56:10 2005

On Wed, Mar 30, 2005 at 08:19:40PM -0700, John Osmon wrote:
> 
> On Wed, Mar 30, 2005 at 07:05:44PM -0500, Jared Mauch wrote:
> [...]
> > 	I think one of the major problems is that very few people know
> > how to, or are capable of sending larger g711 frames (at increased
> > delay, but more data per packet) because they can't set these more granular
> > settings on their systems.. this means you have a lot higher pps
> > rates which I think is the problem with the radio gear, it's just not
> > designed for high pps rates..
> 
> So, how are the WISP folk dealing with VOIP traffic as it becomes a
> larger piece of their customer's traffic?  Does anyone have a way
> to force a given VOIP endpoint to use larger data frames?  Or are

2610(config-dial-peer)#codec g711ulaw ?
  bytes  Specify number of voice data bytes per frame
  <cr>

2610(config-dial-peer)#codec g729r8 bytes ?
  Each codec sample produces 10 bytes of voice payload.
  Valid sizes are:
    10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 
    110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 
    220, 230, 240.

	My Hitachi WIP-5000 also lets me set this locally on the handset
but it uses the delay between packets instead of size..

	The Cisco ata-186 can set this as well:

# -----------------------------------------------------------------------------
#   Parameter:  NumTxFrames
# Access Code:  35
#  Value Type:  Integer  (1 - 6)
#
# Description:  Transmit frames per packet.  
#
#               The frame size for each G.711 and G.729 data packet is 10 ms.
#               The frame size for each G.723 data packet is 30 ms.
#
#    Examples:  To obtain 60 ms of G.723 audio, set the value to 2 (=60/30).
#               To obtain 120 ms of G.723 audio, set the value to 4 (=120/30).
#               To obtain 20 ms of G.711 audio, set the value to 2 (=20/10).
#
#        Note:  Cisco recommends using the default value of 2.

NumTxFrames:2

	

-- 
Jared Mauch  | pgp key available via finger from jared@puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.




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