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can be microcode programmed in CPUs and applied to the packets passing through at line rate. Therefore, at any
point of time, 16 data packets can be processed in parallel, yielding incredible improvement in features and
performance compared to those with traditional designs based on general-purpose microprocessors or ASICs.
Figure 5
PXF Processor Architecture
High-Speed Optical Connectivity
Cisco offers a wide range of OSMs for the Cisco 7600 Series to meet various interface scalability requirements and
allow for high-performance IP service applications. These OSMs provide Internet connectivity at optical speed from
OC-3 all the way to OC-48. Each OSM has two PXF processors on board and provides up to 6-Mpps IP services
performance. The following OSMs are supported:
Packet over Sonet (POS)
• 4- or 8- or 16-port OC-3c/STM-1c with 4 ports of Gigabit Ethernet
• 2- or 4-port OC-12c/STM-4c with 4 ports of Gigabit Ethernet
• 1-port OC-48c/STM-16c with 4 ports of Gigabit Ethernet
ATM
• 2-port OC-12c/STM-4c with 4 ports of Gigabit Ethernet
Gigabit Ethernet
• 4-port Gigabit Ethernet WAN
Egress
Ingress
Feedback
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