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TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine
— 09-10/2013
—
Because of these reasons
the UDP protocol is much
better suited for live trans-
missions of audio and vid-
eo. In this case we‘re deal-
ing with a greatly simplified
protocol in that the data
packets are sent without a
checksum. Aside from that,
the transmitter is not looking
for any kind of return signal
from the receiver. And in
Multicast mode the transmit-
ter really doesn‘t care who‘s
on the receiving end.
Analog to UDP could be
compared to a radio broad-
cast: the DJ reads the news
aloud and has no idea who‘s
listening, no idea how good
the reception is and no idea
if the listener understood
everything that was said.
Unlike TCP, with UDP you
1. DekTec DTE-3137 in action. Amazing how much
performance has been fitted in such a small
device – yet, it can inject a complete DVB-S/S2
transponder into the network.
2. In order to be able to work with IPTV, we had
to get ourselves a gigabit switch. These are
very cheap now, so there is no excuse to keep
struggling with 100MBPS technology.
3. The Dexing NDS3975 in action: it is receiving
three transponders (one from its internal tuner,
one from the Topreal TP-1011 through ASI and
one from the DekTec DTE-3137 through IP). It then
multiplexes a new transponder which is output
through ASI and IP (on a different IP). Amazing!
4. This picture shows one clear advantage of
using only IPTV within a studio or head-end
station: notice the blue network cable – this
single cable is enough to transport all required
information. Actually, all other cables could be
removed (except for the LNB-cable, in case you
want to use the internal tuner).
