RACOM RipEX - Page 18

1. Repeaters connected serially
A packet is transmitted and repeated
in steps 1, 2, 3.
Centre RPT1 RPT2 Remote
1 2 3
In improperly designed networks collisions happen
if a remote radio modem lies in the range of two
X
COLLISION!
1
1
2
2
WRONG
CEN RPT1 RPT2 REM
repeaters (see the image): the packet sent from
the centre (1) is received by both repeaters. It is
repeated by them both (2) causing a collision at
the remote. In other words – there should not be
more than one repeater where the centre and re-
motes' coverage areas overlap.
Solution 1.
Adjust signal coverage so that RPT2 is out of range
of the centre and RPT1 is out of the range of the
GOOD
Coveragearea
1 2 3
CEN RPT1 RPT2 REM
remote radio modem. This can be achieved for
example by reducing the output power or using a
unidirectional antenna.
Solution 2.
Use a single repeater. (Whenever network layout
allows that.)
1
2
Good
CEN RPT1 REM
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