3Com NETBuilder SI Using Manual - page 182
182
A
PPENDIX
D: C
ONNECTORS
AND
C
ABLES
X.21 DCE Cable
Pinouts
This cable connects the bridge/router to an X.21 DTE.
Figure 36 Flex-WAN and X.21 DCE Connectors
.
Table 30 X.21 DCE Cable Pinouts
Flex-WAN Connector
X.21 DCE Connector
Signal
Pin
Direction
Pin
Signal
Twisted Pair
*
* Unused twisted wires of a twisted pair should be connected to Shield Ground. In this cable this
is one wire of twisted pair 4.
CTS/RTS+
1
←
1
Control+
1
CTS/RTS-
2
←
2
Control-
RTS/CTS+
9
→
5
Indicate+
2
RTS/CTS-
10
→
12
Indicate-
TxD/RxD+
11
→
4
Receive+
3
TxD/RxD-
12
→
11
Receive-
Circuit Ground
15
-
8
Control GND
4
TxC/RxC-
23
←
13
Timing-
5
TxC/RxC+
24
←
6
Timing+
RxD/TxD-
27
←
9
Transmit-
6
RxD/TxD+
28
←
2
Transmit+
Shield Ground
46
Cable Shield
1
Shield Ground
-
Shorting Group 1
47
48
-
-
-
-
60-pin Flex-WAN male connector
To SuperStack II NETBuilder
To DTE
15-pin female connector
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46