Cisco 7500 Series Configuration Manual page 35

Chapter 1 Cisco 7500 Series Product Overview
Figure 1-9
Interface
processor
slots 0 and 1
CyBus 0
Note The Cisco 7507-MX backplane includes connectors for time-division multiplexing
(TDM)-compatible hardware. These connectors allow you to connect the Cisco 7507-MX to future
TDM hardware as it becomes available. The Cisco 7507-MX also includes Cisco's turbo arbiter. The
turbo arbiter, when used in conjunction with other future hardware, significantly increases system
bandwidth. When not used with this future hardware, the turbo arbiter operates in standard CyBus
mode.
An RSP2, RSP4/4+, or RSP8 in either slot 2 or slot 3 controls both CyBus 0 and CyBus 1. The dual
CyBus backplane in the Cisco 7507-MX has an aggregate bandwidth of 2.134 Gbps. The two CyBuses
are independent of one another. Interface processors connected to one CyBus are unaffected by the traffic
generated by the interface processors connected to the other.
The backplane slots are keyed so that the processor modules can be installed only in the slots designated
for them. Keys on the backplane fit into two key guides on each module. Although the RSP uses unique
keys, all five interface processor slots use the same key, so you can install an interface processor in any
interface processor slot, but not in the RSP slot.
OL-5008-03 B0
Dual CyBus Backplane in the Cisco 7507-MX
RSP Interface
slots 2 processor
and 3 slots 4–6
CyBus 1
Cisco 7500 Series Installation and Configuration Guide
Cisco 7507-MX Overview
1-13