Specifications

The X.21 Interface 27
VHSI—X.21 Connections
The wiring diagram below shows the connections required to
construct a VHSI—X.21 cable. For additional information required
to construct your own cables, see “Cable Construction Information”
on page 15.
Figure 17. VHSI—X.21 Connections
VHSI
X.21
1
19
4
22
5
23
6
24
8
26
11
29 12
12 3
30 10
8
1
9
7
14
4
11
6
13
5
TWISTED PAIRS
(MANDATORY)
2
DRAIN W IRE
BRAID