3Com CM 4000 218 CM 4000 Installation and Operating Manual

Hardware Installation
2−18 CM 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 2−20; if the SCB is the new style (071 1000 xx), build the cable as shown in Figure 2−21. (No adapter is needed when
the cable is custom−built).
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
Belden 8723 or equivalent
= Shielded, twisted pair
Rx+
Tx+
G
to Encore SCB
RS−422 port
1
2
3
4
5
6
7
8
Tx−
Rx−
Rx+
Figure 2−20. Customer−supplied cable
for connecting CM 4000 to old−style
Encore SCB (061 0884 xx series).
Tx+
G
G
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
Belden 8723 or equivalent
= Shielded, twisted pair
Rx+
Tx+
G
to Encore SCB
RS−422 port
1
2
3
4
5
6
7
8
Tx−
Rx−
Rx+
Figure 2−21. Customer−supplied cable for con-
necting CM 4000 to new−style Encore SCB (061
1000 xx series). These pinouts also apply to the cus-
tomer−supplied adapter, if installed (refer to text).
Tx+
G
G
G
G