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Signal conversion
circuits
POWER LED
Opto loopback LED
X.21 interface loopback LED
CLOCK LED
Opto loopback enable
X.21 loopback enable
Optical interface
Tx
Rx
+
-
Power input 19.5 V to 300 V dc
G.703 communication
interfaceNot connected
15 Transmit data (B)
3 Receive data (A)
16 Receive data (B)
4 Control (A)
24 Signal element timing (A)
11 Signal element timing (B)
17 Control (B)
7 GND
2 Transmit data (A)
X.21 communication
interface
Optical interface
Tx
Rx
Signal conversion
circuits
POWER LED
Opto loopback LED
G.703 interface loopback LED
Opto loopback enable
G.703 loopback enable
Not connected
+
-
Power input 19.5 V to 300 V dc
Receive data (B)
Transmit data (A)
Receive data (A)
Transmit data (B)
G.703 communication
interfaceRxTx
4 3
2 1
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