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