Chapter 3: Operation System statisticsPage 3-63Note450m Overload:The 450m Series AP is designed to handle high load in terms of high throughputand high PPS. In terms of throughput, 450m is designed to achieve 3x or morethroughput improvement over 450 and 450i Series products. In terms of packetsper second (PPS), 450m is designed to handle up to 100k PPS.Overload occurs when the offered load exceeds the above limits. When overloadoccurs, 450m will start discarding packets and TCP throughput will degrade due topacket loss.It’s worth noting that Frame Utilization statistics (Statistics > Frame Utilization tab:Frame Utilization: Downlink and Uplink) are not necessarily indicative of overloadcondition. They show how much the TDD frame is utilized. High frame utilizationdepends on:• High traffic during busy periods: those statistics will be close to 100% andalmost all slots will be utilized. In this case if the Overload statistics show thatpackets are discarded then this is an indication of overload condition.• High percentage of VCs with low modulation with moderate traffic. Those VCswill require more slots to service them (due to low modulation) and the frameutilization will be high. In this case the TDD frame is fully utilized but the systemis at low capacity and is not in an overload condition.450m has higher PPS than 450 and 450i and supports higher throughput throughspatial multiplexing, therefore when a 450m replaces an overloaded 450 or 450i APthe 450m will not be overloaded under the same conditions but the frame utilizationmay still show close to 100%; this should not alarm the customer. The overloadstatistics shall be monitored on 450m to see if it is overloaded or not.Interpreting DHCP Relay statisticsThe Statistics > DHCP Relay page displays requests and replies received, relayed and discarded whenthe AP is configured as a DHCP relay. Typically, in a working DHCP relay configuration a one-to-oneratio is established between requests and replies that are received and relayed. This statistics page isonly applicable for PMP (AP and SM modules) and it is explained in Table 142.
