Simrad AP48 Operator's Manual page 38

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Rx Overflows
The unit received too many messages for its buffer before the
application could read them.
Rx Overruns
The unit contained too many messages for its buffer before the
driver could read them.
Rx/Tx Errors
These two numbers increase when there are error messages, and
decrease when messages are received successfully. These (unlike
the other values) are not a cumulative count. Under normal
operation these should be at 0. Values around 96 upwards indicate
a heavily error prone network. If these numbers go too high for a
given device, it will automatically drop off the bus.
Rx/Tx Messages
Shows actual traffic in and out of device.
Bus Load
A high value here indicates network is near full capacity. Some
devices automatically adjust rate of transmission, if network traffic is
heavy.
Fast Packet Errors
Cumulative counter of any fast packet error. This could be a missed
frame, or a frame out of sequence etc. NMEA 2000 PGNs are made
of up to 32 frames. The entire message will be discarded when a
frame is missed.
Ú Note:
Rx and Tx Errors often indicate an issue with the physical
network, which may be resolved by correcting termination,
reducing backbone or drop lengths, or reducing the number of
network nodes (devices).
Network groups
The Network Group function is used to control parameter settings,
either globally or in groups of units. The function is used on larger
vessels where several units are connected to the network. By
assigning several units to the same group, a parameter update on
Software setup| AP™ 48 Operator Manual