Test highlights for NortelERS 4500 switches in aneight-high stack configuration:• Exceptional stack performance upto 320 Gbps of switching capacitywhen tested with frame sizes of 64through 1,518 bytes• 100% throughput performanceacross 160 10/100/1000BaseTports handling Ethernet framesizes of 64 through 1,518 bytes• Zero frame loss when handling 238millions packets per second• Low latency and jitter that isabsolutely critical for handlingvoice over IP (VoIP) trafficThe Ethernet Routing Switch4500 SeriesThe Nortel Ethernet Routing Switch(ERS) 4500 Series is a stackable, scalableand economical solution that providesthe resiliency, security and convergence-readiness required by application-drivenand constantly changing enterprisenetworks. The series delivers flexibleEthernet switching with Power overEthernet (PoE) models for simplifiednetwork deployments — helping todrive lower total cost of ownership.All five ERS 4500 models can operate asstandalone units or be stacked togetherand managed as a single entity. Modelscan be mixed and matched within astack to meet various performancerequirements including Ethernet, FastEthernet and Gigabit Ethernet. Allmodels feature front-mounted USBports, RS232 consoles and RedundantPower Supply (RPS) capabilities.Product InformationNortel Ethernet Routing Switch 4500 Series showcases 320 Gbpsstack-bandwidth performanceIn April 2007, Nortel conducted tests to evaluate the switching performance of the Nortel Ethernet Routing Switch(ERS) 4500 portfolio — a series of scalable, reliable and secure networking switches that can stack together, creating asingle managed entity of either Fast Ethernet switches, Gigabit Ethernet switches or a combination of both.