TELE-audiovision - The World’s Largest Digital TV Trade Magazine - page 158

TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine
— 09-10/2013
8. Despite having a perfect
picture, StreamXpert indicates
some errors in PAT and PMT.
Interestingly; these were
already present in the original
DVB-S stream…
9. Useful information provided
by StreamXpert: the grid
view, where all active services
within the stream are mapped
according to their PID.
10. Meanwhile, we monitor
our Dexing NDS3975 with
the SnmpNMS management
software. This application
gives us remote access to the
internals of this integrated
professional receiver.
11. On the Mux-tab, we can
specify which channels of
the three different incoming
transponders (through the
internal tuner, ASI-in and IPTV)
we want to output.
ate via a 100MBPS interface;
in view of the fact that the
bandwidth of common DVB-
S/S2 transponders transport
data on average at 50MBPS,
this would be sufficient.
All the IPTV receivers we
know of also operate on a
100MBPS network interface.
Why then would you want to
upgrade to a 1000MBPS in-
frastructure? The simplest
explanation is this: if cars
could only drive at 55 MPH,
then in principle single-lane
roads would be good enough.
But if there are a large num-
ber of cars all on the road at
the same time, then a multi-
lane highway would be much
better even though the cars
would be moving no faster
than 55 MPH. A 100MBPS
switch is designed for this
speed and would fall to its
knees if all the ports would
suddenly demand high data
transfer rates at the same
time. A 1000MBPS switch is
would reach its capacity and
it‘s especially the connection
from the server to the switch
that would need to withstand
enormous amounts of data.
The question often arises
if IPTV should be operated
at 100MBPS or would it be
better at 1000MBPS (also
referred to as 1GBPS or
1GBit/s). It‘s not an easy
answer; it depends ulti-
mately on how you want to
use IPTV and the network.
When different receivers will
only route single transpond-
ers to one or more multiplex-
ers, then for the most part
a 100MBPS network would
suffice. Quite often profes-
sional receivers only oper-
1...,148,149,150,151,152,153,154,155,156,157 159,160,161,162,163,164,165,166,167,168,...260
Powered by FlippingBook