X.21 Pin Assignments - JDS Uniphase SmartClass E1 User Manual

X.21 pin assignments

Table 46 RS-232/V.24 pin assignments (Continued)
Pin Signal Description
8 Data Channel Received Line Signal
Detector
15 Transmitter Signal Element Timing
17 Receiver Signal Element Timing
18 Local Loopback
20 Data Terminal Ready
21 Loopback / Maintenance
24 Transmitter Signal Element Timing
25 Test Indicator
Table 48 lists pin assignments for the X.21 interface.
Table 47 X.21 pin assignments
Pin Signal Description
1 Protective Ground
2 Transmit Data
3 Control
4 Receive Data
5 Indication
6 Signal Element Timing
a
7 Transmitter SIgnal Element Timing
8 Signal Ground
9 Transmit Data
10 Control
11 Receive Data
12 Indication
13 Signal Element Timing
a
14 Transmitter Signal Element Timing
a. Only used with cables CB-44391 and CB-44345
SmartClass E1 Tester User's Guide
Appendix B Specifications
Datacom specifications
Signal Source CCITT Circuit
DCE 109
DCE 114
DCE 115
DTE 141
DTE 108
DTE 140
DTE 114
DCE 142
Signal
Lead
Source
N/A N/A
A DTE
A DTE
A DCE
A DCE
A DCE
A DTE
N/A N/A
B DTE
B DTE
B DCE
B DCE
B DCE
B DTE
Circuit
G
T
C
R
I
S
X
SG
T
C
R
I
S
X
119