[Asterisk-Users] Codecs and bandwidth

[Tim Pushor]

Yeah that makes perfect sense, and was the way that I was initially 
calculating bandwidth requirements and codec costs.  I just found it odd 
that bandwidth was reported both in simplex and duplex. It just confused 
me (which doesn't seem to be too difficult, these days ;-)

Thanks,
Tim


Dan Perik wrote:

> If you include down + up, yes, it's actually about 150-160 using uLaw 
> + IP/UDP/RTP/signaling overhead.  But that's a little misleading, I 
> think.
> 1/2 of that (~75-80) is down, 1/2 of that (~75-80) is up.  So if you 
> have, say, a 1.5Mbps down/384 up DSL connection, you can do up to 4 
> calls simultaneously.  80*4 = 320.  You'd be using 320kbps down and 
> 320kbps up, which is within your 1500kbps down / 384 kbps up.
>
> Someone please correct me if I'm wrong.
>
> - Dan
>
> Tim Pushor wrote:
>
>> Of course - ISDN is bi-directional. I guess saying that ULAW takes 
>> 130K+ bandwidth depending on the framing type (local lan, w/1 hop, 
>> vlan, etc) is not very clear. Thats total bandwidth. With lots of us 
>> at home and small business using asynchronous connections - we need 
>> to keep that in consideration.
>>
>> Thanks for helping clear that up.
>>
>> Tim
>>
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