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Sequence
Network Filter
IA
IB
From Phase
IC
Currents
C0, C1, C2
IKEY
To Channel
Transmitter
SPACE 1
S1
MARK 1
M1
SPACE 2
S2
From Channel
Receiver
MARK 2
M2
FD2
Fault
FD2
Detector 2
LN
LDT1
IKEY, LP
IT
LDT2
COMPARERS
LN = – LP
LP
IKEY
LDT1
TEST
LDT2
IK0
2 CDT
COMM
"1"
3
Figure 3-6. Phase Comparison Logic
LN1
S1
TERM
LN2
3
S2
2
CHOK
"1"
LP1
M1
LP2
TERM
3
M2
2
CHOK
"1"
SETTING
COMM
COMM INTFCE 2: (ON - OFF PLC) OR 3: (FSK PLC)
TERM
# OF TERMINALS, 2 OR 3 TERMINAL LINE
CIN
COMM
3
2
"0"
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