30
DECserver 900GM Installation
BN41D-03: 68-pin to Eight 25-pin DB Octopus Cable (Optional)
Use this cable on DECserver bulk connectors A through D to provide eight partial
modem control connections for each serial port. The following illustration shows a
68-pin bulk connector to eight 25-pin DB connector cable. You can connect the
25-pin DB connectors directly to modems. You must use a crossover adapter or
crossover cable for terminal interconnections. The wire size should be 26 or
28GA, shielded or unshielded, twisted- or untwisted-pair. On the 68-pin
connector, tie pins 33 and 68 together to enable the software to identify the cable.
Table 7 lists the appropriate pin assignments.
LKG–10312–96I
8
7
6
5
4
3
2
1
DSR
DTR
TXD
GND
RXD
RXD GND
CTS
RTS
Recommended Wire Pairings for each MP25 Connector
25–pin Modular Jack
Wires do not need to be
twisted. If they are, they
must be paired as shown
in the diagram.
LKG–10313–96I
9
10
11
12
13
25
24
23
22
21
20
19
18
17
16
15
14
Pair pins 2 and 7
Pair pins 6 and 20
Pair
Pair
