bps serdes, high-speed terminations, and memory, SO it is poised to provide strong QoS support, combined with a low-power, and a high-capacity switch fabric all packaged in a small form factor. The nPX8005 provides eight classes of service (CoSs), thereby enabling greater granularity when handling traffic subject to service level agreements (SLAs) that require improved handling and relia- bility for time-sensitive realms such as VoIP or other system-critical data transfers as opposed to some types of data transfers, such as web page downloads. In general, these can be characterized as lower- priority tasks. For additional flexibility, the nPX8005 offers several robust scheduling algorithms. These include WRR, which is appropriate for fixed-length cell traffic; DRR, which is a wiser choice for variable-length packet traffic such as IP-over-Ethernet; WFQ, which is suited for egress traffic shaping and finer granularity scheduling; and maximal matching RR for connecting ingress to egress. SYSTEMS CONSIDERATIONS WHEN DESIGNING WITHAMCC NP FAMILY NPUS A systems designer should consider several factors when designing with AMCC nP family NPUs. First, to partition the logic into logical parts of a chassis-based design, the traffic manager 5700 chipset must be implemented on the line card, whereas the switch fabric 5800 must be integrated on the fab- ric card. As no serdes controllers are integrated in either of these products, unless a very low-speed single-board system is being designed (when the traffic manager and switch fabric can be connected directly), the chassis-based systems designer must use separate serdes components. More specifically, he or she must use four of them for each 5800 fabric chip. AMCC offers serdes devices (such as S2512, which provides four full-duplex 2.5 Gbps serial links) that are seamlessly compatible for such an application. Figure 6.6 shows a configuration of the scalability of the solution for OC-48 or OC-192. An OC-192 or 10 Gigabit Ethernet configuration based on the newer nP7510 netwo