3Com CM 4000 221CM 4000 Installation and Operating Manual

Hardware Installation
2−21CM 4000 Installation and Operating Manual
For those who wish to prepare their own cable: if the SCB is the old style (071 0884 xx series), build the cable as shown in
Figure 2−24; if the SCB is the new style (071 1000 xx), build the cable as shown in Figure 2−25.
1
6
Rx−
2
7
3
Tx−
8
4
9
5
to CM 4000
Serial port
DB9P
(male) RJ45P
(male)
Rx+ Receive plus
Rx− Receive minus
Tx+ Transmit plus
Tx− Transmit minus
G Ground
= Shielded, twisted pair
Rx+
Tx+
G
to Encore SCB
RS−422 port
1
2
3
4
5
6
7
8
Tx−
Rx−
Rx+
Figure 2−24. Customer−supplied cable for
connecting redundant CM 4000s to old−style
redundant Encore SCBs (061 0884 xx series).
Tx+
G
G
1
6
Rx−
2
7
3
Tx−
8
4
9
5
DB9P
(male) RJ45P
(male)
Belden 8723 or equivalent
Rx+
Tx+
G
to Encore SCB
RS−422 port
1
2
3
4
5
6
7
8
Tx−
Rx−
Rx+
Tx+
G
G
to CM 4000
Serial port