R&S M3SR 4100 Series, Operating Manual

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Operating Manual 6175.4760.02 – 01 5.57
M3SR Series 4100 Rebroadcast / Relay Mode
1 IP subnet (e.g. 10.0.1.0)
2 IP subnet (e.g. 10.0.2.0)
3 IP subnet (e.g. 10.0.3.0)
4 IP subnet (e.g. 10.0.4.0)
5 IP subnet 1 (e.g. 10.1.1.0)
6 IP subnet (e.g. 10.2.0.0)
7 IP subnet 2 (e.g. 10.1.2.0)
8 Waveform net 1 (e.g. SECOM-H)
9 Waveform net 2 (e.g. SECOM-H)
10 Rebroadcast station
11 Example for data/voice path
Propagation and Routing
The digitally vocoded voice data is propagated according to the configuration of the wave-
form net. To transfer digitally vocoded data from one rebroadcast radio to the other, the data
is packed into IP packets and transferred as standard IP packets via Ethernet. The counter-
part radio unpacks the IP packets containing the digitally vocoded voice and propagates it
into its associated waveform net as digitally vocoded voice data again.
For transferring IP data from e.g. PC2 to PC3 a standard IP routing takes place. This means
that all involved nodes and radios need to have appropriate routing tables. This routing infor-
mation can be prepared automatically with the help of the Routing Wizard of
R&S RNMS3000. Alternatively, the routing tables may be set manually by using the MMI or
remote control.
If only IP data is transferred via a Rebroadcast Station, the data rates of the two asso-
ciated waveform nets may differ. Though the radios have large data buffers for inter-
mediate data storage, it may happen that data is lost when the second net is much
slower than the first net or the second net is "busy" and a lot of traffic is sent via the
Rebroadcast Station.