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Unread 06-21-2007, 04:23 AM   #1
yfm
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Default Limited Traffic Monthly Quota

Some broadband providers impose a ceiling to their broadband connection. I wonder how would I calculate the impact of my VoIP usage to my montly quota?

I recall reading a posting in this effect. I cannot remember if it was here or somewhere else.
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Unread 06-21-2007, 05:18 AM   #2
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Default Bit rate for G.711, G.726, G.729 Codecs

Per the following link - broadband help » Forums » Up and Running » VOIP Tech Chat » [Vonage] 90, 50 and 30 "Codecs"

ITU Codecs - Bit rates (DSL stream rate)

G.711 - 106,000 bits/sec
G.726 - 84,800 bits/sec
G.729 - 42,400 bits/sec

More details in the linked page above

_.
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Unread 06-21-2007, 09:05 AM   #3
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Does anyone know how broadband providers count data traffic?
by data traffic in IP layer? or by data traffic in other layer?
and at which checking point do the broadband providers count?

thanks.
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Unread 06-21-2007, 01:49 PM   #4
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kurun:
Thank you for the response. Let me bother you with the math as it has been a very long time since I was concerned with the bits and bytes.

Quote:
G.711 - 106,000 bits/sec
To calculate an hour of call using 711 codec here is my calculation:
106,000 bits/sec divided by 8 = 13,250 bytes/sec
13,250 bytes/sec x 60 seconds x 60 minutes = 47,700,000 bytes/hour
In short my streaming for an hour is 47.7MByte per hour.

Assuming that I will keep talking for 6 hours per day, my total usage per month is 8,586 MByte of traffic (8.5GB).

In other words the 60GB imposed by Rogers are not an issue, right?
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Unread 06-21-2007, 03:36 PM   #5
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Maybe
1G Bytes=1,024M Bytes=1,024X1,024K Bytes=1,024X1,024X1,024 Bytes=1,073,741,824 Bytes.

Last edited by hust; 06-21-2007 at 03:51 PM.
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Unread 06-22-2007, 12:24 AM   #6
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In round numbers, I think the calculation above is corect though as hust points out there is a small correction for the binary based Kilobyte (2^10), Megabyte (2^20), and Gigabyte (2^30).

There might be some differences in the overall stream rate between DSL and Cable Broadband due to different overhead in the transmit process.

I suspect that the broadband providers count data traffic in the most advantageous way possible, ie. total bits transmitted, not net data bits.

Maybe I'll call Rogers technical support, and ask, when I find some time to sit there and listen to not so nice music ...........
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Unread 06-24-2007, 02:26 PM   #7
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kurun:
My calculation was a very rough estimate. When I subscribed to Rogers which has a 60GB ceiling traffic, I got a little bit nervous. However, I found my worries are baseless because if I keep the line open for 24 hours (which will never be the case) I will end up using from 32GB to 36GB which is around half the quota. I have to admit that the cable is faster than the DSL (unless I had the wrong impression).

It will be interesting to know for technical discussion how much 711 codec will consume per minute on a cable connection with all the associated overhead. I will try for testing purpose force my ATA to make calls using the 729 codec and see if there will be a huge difference in sound quality or not.
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