[Asterisk-Users] How does TDM work?

[Andrew Kohlsmith]

On Tuesday 02 August 2005 06:35, Obelix wrote:
> I have seen the Asterisk info about TDMoE - does this mean that the
> Asterisk card will modulate the signal on the Ethernet cable to allow it
> plug directly into a proper TDM connection?

TDMoE is just a method of taking the 8000Hz, 8-bit ulaw/alaw audio from a TDM 
interface and stuffing them into raw ethernet frames.  The destination MAC 
must obviously be on the same ethernet network.  Different segments are fine 
since any competent switch will be able to get the frames to their 
destination.

In a nutshell.  Take a raw ethernet frame.  You have the ethernet header and 
the payload.  Take the destination MAC and put it in the header, and take the 
TDM data and put it in the payload.  There may be a little more in the 
payload (timestamps I would suspect).  Send it out to the card.

That's it.

-A.