3Com CM 4000 278 CM 4000 Installation and Operating Manual

Hardware Installation
2−78 CM 4000 Installation and Operating Manual
Utility Connections
+5 V and ground utility connections are provided on the back panel. There are two +5 V connectors, each of which is equipped
with a PCB−mounted 1 amp fuse. The fuse is designed to reset itself automatically.
to external
device
PVA1352
See Figure 2−92.
9
10
11
12
13
14
15
16
8
7
6
5
4
32
1
8
7
6
5
4
3
2
1
S1
+5V R1
10K
VBRD (31)
1U84
F86
[SMT]
3R9
220
2
35
8
RDB (31)
RDA (31)
J2−B9
J2−B8
Figure 2−90. MI/MC 3040 optoelectronic relay circuit (example). For discussion, see page 2−77.
2
U16
from external
device
Figure 2−91. MI/MC−3040 optical coupler status circuit (example). For discussion, see page 2−77.
+5V
R137
10K
OPTO (31) 4
3
1
2
U69
PC314
(TM2)
R89
2K
STB (31)
STA (31) J1−B8
J1−B9