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RFL SMX3 / 21 Page 21 of 22 Issue 1.4
User Manual
08 June 2009
Example 2: X.21 synchronous data links point to point, and two V.24
channels concatenated over two links (e.g. X.21 protection relays and
SCADA network on two BT kilostream X.21 links):
Only possible on a well disciplined system, where only one terminal transmits at
one time. This configuration assumes that both X.21 links are running on the
same network master clock e.g. BT Kilostream. V.24 channels configured in
Transparent mode.
DIP Switch Settings for A1, C1
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
DIP Switch Settings for units B1, B2
8 7 6 5 4 3 2 1
SW1 0 0 0 0 0 0 0 1
SW2 0 0 1 0 0 1 0 0
SW3 0 0 1 0 0 1 0 1
SW4 Not used
SW5 0 1 1 0 0 0 0 1
SW6 0 1 0 0 0 0 0 0
Substation A Substation B Substation C
BT X.21
Aggregate Concatenation
Example installation – Protection & SCADA
A1
X.21 V.24 V.24
Ch A Ch B Ch C
Port Port Port
B1
X.21 V.24 V.24
Ch A Ch B Ch C
Port Port Port
BT X.21
B2
X.21 V.24 V.24
Ch A Ch B Ch C
Port Port Port
C1
X.21 V.24 V.24
Ch A Ch B Ch C
Port Port Port
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