You're right. It's symmetric so it only takes 83Kbits/sec for u-law. IPTraf is confusing me :-)
----- Original Message ----- From: "John Fraizer" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, March 10, 2004 11:41 AM Subject: Re: [Asterisk-Users] Asterisk Codecs [G.729] > > You need to decide if you're going to measure both sides of the call or not. > ITU standard is 64Kbits/s. That is correct. It is a standard DS0. But, > guess what. That DS0 goes both directions so, "measured bandwidth per call" > is 128Kbits/s using your logic. > > Only "consumer" grade DSL/Cable bandwidth is asymmetric. These "wanna-be" > connections and the accompanying garbage that the sales/marketing monkeys > spew (that the general public laps up as accurate) have done nothing but > cause confusion to people who don't work the network side of the industry. > > [rent on] > (Besides that, it makes their peering ratio so lopsided that there is no way > they're going to get any decent no-settlement bilateral peering and as such, > the price of those connections is going to remain artificially high since > the providers have to PURCHASE transit instead of simply peering.) [rant off] > > When I order an OC3, it's 155Mb/s in BOTH DIRECTIONS. The industry doesn't > say "That's 310Mb/s of bandwidth" because the measure of circuit bandwidth > is by maximum one-way FLOW. You can (on paper) flow 155Mb/s in one > direction on an OC3 (including encapsulation overhead). > > So, if you want to use accepted telco + IP metrics for measuring the flow > (and thus the bandwidth), you look at the GREATER OF THE IN/OUT flow and > that is how much bandwidth is required. > > ULAW = 83Kbits/s including encapsulation overhead. > > John > > > wrote: > > Absolutely agree, > > > > ITU standard is 64Kbits/sec. > > > > VoIP traffic with U-law per channel is 83Kbits/sec. > > > > VoIP traffic with U-law per call is 166Kbits/sec [measuring bandwidth per > > call] > > > > ----- Original Message ----- > > From: "Nicolas Bougues" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Wednesday, March 10, 2004 9:55 AM > > Subject: Re: [Asterisk-Users] Asterisk Codecs [G.729] > > > > > > > >>On Wed, Mar 10, 2004 at 09:03:57AM -0800, <Unavailable ID> wrote: > >> > >>>Rich, > >>> > >>>In real world, using real tool, getting real number. You don't expect > > > > to > > > >>>either talk only mode or listen only mode. Per call must have Rx & Tx > > > > for > > > >>>inbound & outbound. > >>> > >> > >>[...] > >> > >> > >>>Engineering rate is per channel but to calculate the bandwidth > > > > consumsion, > > > >>>it must be in realtime full-duplex. > >>> > >> > >>Sure, but in the real world, IP trafic is mostly carried over full > >>duplex links (either serial or switched Ethernet), so you usually > >>consider the trafic in one direction only (provided it's symetrical). > >> > >>If I consider an E1 to be 2 Mbps (2 inbound, 2 outbound, really), and > >>Fast Ethernet to be 100 Mbps (again, 100+100 in full duplex), I shall > >>consider U-law to be 83 kbits/s, not 166. > >> > >>-- > >>Nicolas Bougues > >>Axialys Interactive > >>_______________________________________________ > >>Asterisk-Users mailing list > >>[EMAIL PROTECTED] > >>http://lists.digium.com/mailman/listinfo/asterisk-users > >>To UNSUBSCRIBE or update options visit: > >> http://lists.digium.com/mailman/listinfo/asterisk-users > >> > > > > > > _______________________________________________ > > Asterisk-Users mailing list > > [EMAIL PROTECTED] > > http://lists.digium.com/mailman/listinfo/asterisk-users > > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
