RE: [manet] What is the difference between TDM and TDMA?

["Farrag, Osama" <Osama.Farrag at jhuapl.edu>]

Leon,

FYI, Amoakoh's description is more accurate than mine, I was thinking of
TDM use in point to point environment, and did not consider the point to
multi-point case.

Regards
Osama 

-----Original Message-----
From: Amoakoh Gyasi-Agyei [mailto:a.gyasi-agyei at cqu.edu.au] 
Sent: Wednesday, August 17, 2005 7:35 PM
To: Farrag, Osama; MANET Newsgroup
Subject: RE: [manet] What is the difference between TDM and TDMA?

Leon,

The main difference between tdm and tdma (also fdm/fdma, etc) is that
with tdm (also fdm, etc.) the signals multiplexed (i.e. sharing a
resource) come from the same node, whereas for tdma (also fdm, etc.) the
signals multiplexed come from different sources/transmitters. This is
the reason why we use tdm for downlink (forward link) and tdma for
uplink (reverse link).

Cheers,
Amoakoh

-----Original Message-----
From: manet-bounces at ietf.org [mailto:manet-bounces at ietf.org] On Behalf
Of Farrag, Osama
Sent: Thursday, August 18, 2005 9:16 AM
To: MANET Newsgroup
Subject: RE: [manet] What is the difference between TDM and TDMA?

Leon,

- Time Division Multiplexing (TDM) imply partitioning the bandwidth of
the channel connecting two nodes into finite set of time slots. 

- Time Division multiple Access (TDMA) imply partitioning the bandwidth
of a channel shared by many nodes, typically an infrastructure node and
several mobile nodes, where each node gets to access its dedicated time
slot. 

Hope this helps
Osama Farrag

-----Original Message-----
From: manet-bounces at ietf.org [mailto:manet-bounces at ietf.org] On Behalf
Of Leon Martin
Sent: Wednesday, August 17, 2005 5:59 PM
To: MANET Newsgroup
Subject: [manet] What is the difference between TDM and TDMA?

See the title for the question.

Thanks.

- Leon


		
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