M3SR Series 4100 Rebroadcast / Relay Mode
5.64 Operating Manual 6175.4760.02 – 01
1 IP subnet (e.g. 10.1.1.0)
2 Waveform net (e.g. SECOM-H)
3 IP subnet (e.g. 10.2.0.0)
4 Rx radio
5 Tx radio
6 Example of data/voice path
PtP Point-to-Point
PtM Point-to-Multipoint
Propagation
In case of a relay station the relay radios take over different roles, according to the IP subnet
and waveform configuration. Only one radio receives the data coming from the user radios
(Rx radio). For that purpose every user radio has a waveform point-to-point connection to the
Rx radio. The data is collected into IP packets and sent via local Ethernet to its partner radio.
The second radio only transmits the data coming from the Rx radio using a waveform point-
to-multipoint mode.
This configuration ensures a minimum impact on the particular radio channels, coming either
from the user radios or the relay Tx radio.
IP Routing
Concerning IP traffic, the PCs and the radios need specific IP routes. As mentioned before,
the two relay radios are also members of the same IP subnet as all other radios.
Configuration of PCs and user radios:
• The relay Rx radio must be set as gateway for all destinations.
Configuration of the relay radios:
• The relay radios need particular routing tables, too. The Rx radio has only one routing
table entry with default gateway Tx radio. The Tx radio needs routing table entries for all
PCs behind the radios.
With the Routing Wizard of R&S RNMS3000 these routes can be set automatically for the
user radios and also for the relay station's radios.
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