nanog mailing list archives
Re: Clearwire May Block VoIP Competitors
From: Jared Mauch <jared () puck nether net>
Date: Wed, 30 Mar 2005 19:05:44 -0500
On Wed, Mar 30, 2005 at 11:32:33PM +0000, Paul Vixie wrote:
the bigger issue with 802.11 and VoIP is that wireless ethernet tends to be half duplex whereas codecs tend to run both directions at once. who's getting good service over 802.11 using G.711 or G.729? (no fair if your wireless handset has its own proprietary halfdup codec, i'm talking real SIP here.)
you didn't ask for the size of the wireless network(1), in my experience i've not had any (major) problems with this, the key is to insure that the packets are somehow QoS'ed at the edge, even if your provider won't do QoS to you, you can do some neat artifical QoS on your upstream/uplink interfaces.. What i've done is rate-limit TCP inbound to be around 75-80% of the link speed to force things to back-off and leave space for my UDP packet streams. 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.. big thing i've noticed in operational experience is that not all 802.11 handsets handle AP roaming seamlessly, some want to disconnect then re-dhcp for what is the same ssid/network domain. - jared (1) - i'm speaking for a single-ssid network with more than one AP that covers long-distance clients at 1Mb/s speeds on 802.11b (250meter+ one way) -- Jared Mauch | pgp key available via finger from jared () puck nether net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
Current thread:
- Re: Clearwire May Block VoIP Competitors, (continued)
- Re: Clearwire May Block VoIP Competitors Adi Linden (Mar 26)
- Re: Clearwire May Block VoIP Competitors Mikael Abrahamsson (Mar 26)
- Re: Clearwire May Block VoIP Competitors Paul G (Mar 26)
- Re: Clearwire May Block VoIP Competitors Adi Linden (Mar 26)
- Re: Clearwire May Block VoIP Competitors Robert Bonomi (Mar 26)
- Re: Clearwire May Block VoIP Competitors Chip Mefford (Mar 28)
- RE: Clearwire May Block VoIP Competitors Hannigan, Martin (Mar 26)
- Re: Clearwire May Block VoIP Competitors Robert Bonomi (Mar 28)
- RE: Clearwire May Block VoIP Competitors Howard, W. Lee (Mar 30)
- Re: Clearwire May Block VoIP Competitors Paul Vixie (Mar 30)
- Re: Clearwire May Block VoIP Competitors Stephen J. Wilcox (Mar 30)
- Re: Clearwire May Block VoIP Competitors Jared Mauch (Mar 30)
- Re: Clearwire May Block VoIP Competitors John Osmon (Mar 30)
- Re: Clearwire May Block VoIP Competitors Jared Mauch (Mar 31)
- Re: Clearwire May Block VoIP Competitors Paul Vixie (Mar 30)
- RE: Clearwire May Block VoIP Competitors Christopher L. Morrow (Mar 30)
- Re: Clearwire May Block VoIP Competitors Stephen Sprunk (Mar 31)
- potpourri (Re: Clearwire May Block VoIP Competitors ) Paul Vixie (Mar 31)
- Re: potpourri (Re: Clearwire May Block VoIP Competitors ) Mikael Abrahamsson (Mar 31)
- Re: potpourri (Re: Clearwire May Block VoIP Competitors ) Joe Abley (Mar 31)