
RFL SMX3 / 21 Page 20 of 22 Issue 1.4
User Manual
08 June 2009
14. Example Configurations
Example 1: X.21 synchronous data point to point and two channels of V.24
asynchronous data point to point.
This configuration assumes a master clock signal is provided by the X.21 links.
V.24 channels configured in Transparent mode.
DIP Switch Settings for both units
8 7 6 5 4 3 2 1
SW1 0 0 0 0 0 0 0 1
SW2 0 0 0 0 0 1 0 0
SW3 0 0 0 0 0 1 0 1
SW4 Not used
SW5 0 0 0 0 0 0 0 1
SW6 0 1 0 0 0 0 0 0
Substation A Substation B
X.21
A1
Example installation – Single X.21 and two V.24 channels
X.21 V.24 V.24
Ch A Ch B Ch C
Port Port Port
X.21 V.24 V.24
Ch A Ch B Ch C
Port Port Port
B1
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