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
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