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-----Original Message-----
From: steve szmidt <[EMAIL PROTECTED]>
To: Commercial and Business-Oriented Asterisk Discussion <[email protected]>
Sent: Sun, 27 Mar 2005 16:34:42 -0500
Subject: Re: [Asterisk-biz] Forklift a 2000 phone PBX
On Sunday 27 March 2005 15:14, Reid Forrest wrote:
> This seems like a really bad idea. Why lock down into a not onlyold and
> outdated technology, but for 2000 users?!!does
>
> You want to keep the network operating efficiently. Modern switches
> a lotthere.
> better job than yesterdays technology. If you have 250 people on the
> phone at
> the same time, and you are using g.729, you have used 10Mb right
best> Never > mind any other protocol.
Steve, I agree with you that trying to run voice over Cat3 is not the
idea. But, I think your math may be off in the calculation above. 250overhead of
people on the phone using g.729, even compensating for protocol
25% is only 2.5Mbit/sec.
Sorry but we are not talking about a one way conversation. It requires shy of
20K for a two way conversation.
In addition, you are assuming that the voicenetwork
network is completely FLAT, not switched. A fully switched voice
would reduce bandwidth consumption at every station.
No it doesn't. Switched does not lower the needs of a g.729 connection. The
only savings are in not having collisions, and retransmissions, as with a
hub.
A 2000 user switched voice network over Cat3 is viable, as long as you keep data off of it.
Well, it turned out that he has Cat 3 from the previous phone system available, and that is what he is talking about. I missed that point.
As for a dedicated Cat 3 to run a voice leg to a switch that would obviously
be fully workable. However, if you were to integrate it to a 100Mb network
then it will switch down the 100 for each 10 packet entering that leg. Of
course that might still be faster than running a 10Mb network.
--
Steve Szmidt
"They that would give up essential liberty for temporary safety
deserve neither liberty nor safety."
Benjamin Franklin
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