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Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0
Chapter 1 Cisco 7500 Series Product Overview
Cisco 7576 Overview
Identifying Cisco 7576 Independent Routers and CyBuses
The Cisco 7576 dual CyBus backplane includes 13 slots and provides two independent routers on a split
backplane, designated router A and router B.
The interface processor slot numbering scheme (see
Figure 1-19
) on the card cage of the Cisco 7576
provides easy identification of the independent routers, CyBuses, and slots that make up the Cisco 7576
backplane. The scheme uses color coding to help you differentiate between the independent router and
CyBus assignments.
•
White text on dark-colored backgrounds identifies router A components:
–
CyBus 0 is assigned interface processor slots 0, 1, 3, and 5 (white on red).
–
CyBus 1 is assigned interface processor slots 2 and 4 (white on blue).
–
The RSP for router A is assigned slot 6 (white on dark gray).
•
Dark gray text on light-colored backgrounds identifies router B components:
–
CyBus 2 is assigned interface processor slots 8, 10, and 12 (dark gray on yellow).
–
CyBus 3 is assigned interface processor slots 9 and 11 (dark gray on light green).
–
The RSP for router B is assigned slot 7 (dark gray on white).
Figure 1-19
Enlarged View of the Cisco 7576 Interface Processor Slot Numbering Scheme
Note
To provide a viewable image, slot numbers 0, 1, 2, 11, and 12 are not shown in
Figure 1-19
. The slot
numbering scheme uses color coding to assist in identifying routers and CyBus assignments.
CyBus Slot Number Assignments
The slot number assignments of the independent router CyBuses are separated by design. This facilitates
automatic distribution of the system load across the CyBuses as interface processors are added. This
design also provides better electrical flow and improves signal timing on the backplane.
Caution
If you are only configuring one of the two routers that make up the Cisco 7576, make sure to
configure router A instead of router B. To configure router A, install an RSP4/4+ or RSP8 in slot 6,
and install interface processors in slots 0 through 5.
3
4
5
6
RSP
9
10
8
7
RSP
7576 ROUTER B
1484
6
7576 ROUTER A
