JDS Uniphase SmartClass E1 - X.21 Pin Assignments

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