Interface - Eicon Networks Eiconcard C90 Installation Manual

X.21 interface
A pin-out diagram for the X.21
interface is shown in Figure 11.
The signal definitions and names
are listed in Table 8.
Pin # Signal
1/15 PGND
2 T(A)
3 C(A)
4 R(A)
5 I(A)
6 S(A)
7 B(A)
8 SGND
9 T(B)
10 C(B)
11 R(B)
12 I(B)
13 S(B)
14 B(B)
Name
Protective Ground
Transmit Data (+)
Control Signal (+)
Receive Data (+)
Indication (+)
Signal Element Timing (+)
Byte Timing (+)
Signal Ground
Transmit Data (-)
Control Signal (-)
Receive Data (-)
Indication (-)
Signal Element Timing (-)
Byte Timing (-)
Table 8. X.21 interface signals
VHSI port specifications
1
PG N D
T(A)
C(A)
R(A)
I(A)
S(A)
B(A)
SGND
8
Figure 11. X.21 interface
Direction
Common
Output
Output
Input
Input
Input
Input
Common
Output
Output
Input
Input
Input
Input
9
T(B)
C(B)
R(B)
I(B)
S(B)
B(B)
PG ND
15
CCITT #
101
103A
105A
104A
109A
115A
114A
102
103B
105B
104B
109B
115B
114B
27