RADIUS
Product
Description
PDR 121
iom_pdr121_04_r02.doc
Rev 02
Page 60 (67)
14 Radio Test Functions
14.1 Bit Error Rate Test
This function tests the connection data quality directly between two radios without repeater radios
in the radio system. The attenuator
Att-4
is serially connected to the radio unit as shown in the
figure below.
The transmission quality is evaluated by the result of the bit error rate test.
If no errors appear at the highest attenuation level, there is
at least
30dB margin until bit errors
appear. For secure data transmission, the attenuation levels 0, 1 and 2 should be without faults. On
attenuation
level 2
, the bit error rate
should
be below 10% (100 bit errors). Please contact
RADIUS support to evaluate any test results.
A command is transmitted from the particular radio unit to the receiving radio unit, which replies by
transmitting back a random sequence bit stream. A correctly received character is displayed on
the screen as ’U’ and an incorrectly received character is displayed as ‘.’ (Dot). The function should
be used with the automatically controlled attenuator, Att-4, which is connected via the Rbus. The
Att-4 attenuates the bit stream transmitted by the radio in four stages. A total of 4000
(1000+1000+1000+1000) characters are transmitted from the transmitting radio.
Bit error rate test
Station ID: 1111
UUUUUUUUUUUUUUUU UUUUUUU U
UUUUU UUU UUUUUU UUUUU
UUUUUUUUUUUUUUUUUUUUUUUUUUU
UUUUUUUU UUU UUUUUUU
UUUUU
Radio unit
Att-4
Computer
Rbus cable
Coaxial cable
ProgInt
