Specifications

4. Autospeed
Normally all radio modems in a network have to transmit with the same data rate on the same radio
channel. The Autospeed feature of RipEX enables different speeds to be used simultaneously in a radio
modem network.
The following picture gives an example of a network layout. Let us assume, that all signals are strong
enough to ensure almost perfect operation:
Fig. 4.1: Autospeed - initial situation
After some time situation changes and path loss on one of these links significantly increases, rendering
the communication unreliable:
Fig. 4.2: Autospeed - problem
What can we do:
Change antennas on one or both sides of the link
Use higher masts on one or both sides of the link
Build additional repeater(s)
Lower the data rate significantly to increase the system gain
The first three possibilities require time and money, i.e. additional investment. The fourth possibility
(when applied to whole network, as it normally is the case) would slow down the response time (two
RipEX Application notes – © RACOM s.r.o.30
Autospeed