3com NETBuilder SI Manual De Usuario
Serial Connectors and Flex-WAN Cables
181
X.21 DTE Cable
Pinouts
This cable connects the bridge/router to an X.21 DCE.
Figure 35 Flex-WAN and X.21 DTE Connectors
.
Table 29 X.21 DTE Cable Pinouts
Flex-WAN Connector
X.21 DTE 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
←
5
Indicate+
1
CTS/RTS-
2
←
12
Indicate-
RTS/CTS+
9
→
3
Control+
2
RTS/CTS-
10
→
10
Control-
TxD/RxD+
11
→
2
Transmit+
3
TxD/RxD-
12
→
9
Transmit-
Circuit Ground
15
-
8
Control GND
4
RxC/TxCE-
25
←
13
Timing-
5
RxC/TxCE+
26
←
6
Timing+
RxD/TxD-
27
←
11
Receive-
6
RxD/TxD+
28
←
4
Receive+
Shield Ground
46
Cable Shield
1
Shield Ground
-
Shorting Group 1
47
48
48
-
-
-
-
Shorting Group 2
51
52
52
-
-
-
-
60-pin Flex-WAN male connector
To SuperStack II NETBuilder
To DCE
15-pin male 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