Toshiba G1IF1 Instruction Manual page 9

Figure 3.3 shows the signal definitions for the G703 or X.21 connection, note that a number of
the signals specified for the standard are not required for this application. Table 3.1 specifies all
electrical connections to the G1IF1 unit.
G1IF1-01
Shield Ground
1
SG
2
Ta
Transmit
9
Tb
3
10
4
Ra
Receive
11
Rb
5
12
Signal
Sa 6
Timing
13
Sb
7
14
8
Common Ground
15
CG
(a) Signal Definitions for G1IF1-01 (X.21) Interface
G1IF1-02, 03
Shield Ground
FG
Ta
Transmit
Tb
Ra
Receive
Rb
Signal
Sa
Timing
Sb
(G703 1.2.3, 1.2.2 I/F only)
CG
(b) Signal Definitions for G1IF1-02 and -03 (G703) Interface
1
6
7
8
9
10
11
Figure 3.3 Signal Definitions
 8 
6 F 2 S 0 7 5 5
Telecommunications
Multiplexer
Telecommunications
Multiplexer