Cambium Networks PMP 450 AP, Configuration Manual

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Chapter 3: Operation System statistics
Page
3-62
Ethernet Out Discards This field represents the number of packets tossed due to an Ethernet out
overload. This stat must not climb in normal operation because the Ethernet
link is much higher capacity than the RF link. If this stat is incrementing, then
either the Ethernet link is established at a low speed (i.e. 10Mbps – half
duplex), or there is a problem with cabling/Ethernet hardware.
RF In Discards This field indicates the number of packets tossed due to no resources
available within the radio to process them. This stat also must not be
increasing because the system is designed to shed packets on the RF Out
interface. If this stat is incrementing the board, it is most likely congested
due to high PPS rate in combination with an Ethernet Out problem, which
limits packet flow off the device.
RF Out Discards This field indicates the number of packets tossed due to RF link at capacity.
This stat will increase whenever the RF link is at capacity. When the internal
FPGA RF input queue overflows, this stat is incremented. If this stat is seen
to be incrementing at the AP, then the sector is congested. If seen at the SM,
the number of Contention Slots must be looked at to ensure that enough
Contention Slots are allocated to allow for bandwidth requests to be seen at
the AP.