24
DECserver 900GM Installation
Connector Pin Assignments (Cont.)
Table 5 (Cont.) 68-pin to Four 25-pin DB Octopus Cable Pinout
25-pin DB
Number
Twisted
Pairings
25-pin DB
Pin Number
68-Pin
Pin Number
Full Modem
Control Signal
3
1 and HOUSING
HOUSING
SHIELD
P i
{
2
9
TXD
Pair
{
7
43
GND
P i
{
3
10
RXD
Pair
{
7
44 and 60
GND
P i
{
4
45
RTS
Pair
{
5
11
CTS
{
20
46
DTR
Pair
{
6
12
DSR
{
8
26
DCD
Pair
{
22
27
RI
{
12
28
SMI
Pair
{
23
61
DSRS
4
1 and HOUSING
HOUSING
SHIELD
P i
{
2
13
TXD
Pair
{
7
47
GND
P i
{
3
14
RXD
Pair
{
7
48 and 64
GND
P i
{
4
49
RTS
Pair
{
5
15
CTS
{
20
50
DTR
Pair
{
6
16
DSR
{
8
30
DCD
Pair
{
22
31
RI
{
12
32
SMI
Pair
{
23
65
DSRS
NOTE:
On the 68-pin connector, tie pins 67 and 68 together to enable the
software to identify the cable.