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Plexus 9000 Planning and Engineering Guide
System Overview
Section 130-110-000
Issue 6, May 14, 2004
Telica, Inc.
3-19
P414-AA
08-01-01
T1
protection
bus
T3
protection
radial
connect
1
I/O-1
2
I/O-2
3
I/O-3
4
I/O-4
5
I/O-5
6
I/O-6
7
I/O-7
8
I/O-8
2 0
I/O-16
19
I/O-15
18
I/O-14
17
I/O-13
16
I/O-12
15
I/O-11
14
I/O-10
9
SP/
TMG
A
10
SW
FAB
A
11
I/O-9
12
SW
FAB
B
13
SP/
TMG
B
21
I/O-17
Figure 3-7. Protection and Midplane II and III
3.3.1.4
Electrical Line Interfaces
Electrical line interface modules are usually paired with rear modules that
contain the physical interfaces, allowing all signal cabling to be installed
from the rear of the unit. Protection cards do not require cabling.
3.3.1.5 Forced-air
Cooling
Forced-air cooling is provided by fans mounted in a removable tray
located at the top of the unit. Air is drawn in from the bottom of the
chassis through a removable filter and it exits the shelf through the top and
rear. The 85-3004 chassis contains the 85-3005 Fan Tray with high-speed
fans. Fans are monitored for failure and an over-temperature sensor is
provided.
3.3.1.6 Power
Input
At the lower rear of the chassis are the -48 Vdc power A and B feeds as
illustrated in
. The shelf provides independently replaceable
line filters for each power input. Chassis grounding is also supplied in this
area.