NS3000/iX Operations and Maintenance Reference Manual (36922-90042)

Appendix A 191
LINKCONTROL Command
NS 3000/iX LAN Link Statistics
• Noise from another node.
• Bad chips.
The value of the 802 chip restarts field provides information about the
performance of the LAN card and the status of the LANCE chip status
for overflow/underflow errors (this is monitored by firmware).
Frame losses — The frame losses field indicates the number of times
that the LAN controller chip indicated that it has lost a frame. After
some delta period of time following a transmission, no collision detect is
seen. This is typically because there are no free receive buffers when a
frame arrives.
Receives Dropped (NIO card only) — The Receives Dropped field
indicates the total number of frames that were dropped because there
was no receive buffer posted.
Receives Broadcast (NIO card only) — The Receives Broadcast field
indicates the total number of frames received that were addressed to a
broadcast address. If no broadcasts have been received, check the
current receive filter to ensure that broadcasts are enabled. If
broadcasts are enabled and no broadcasts have been received, this may
be an indication of a faulty LAN card.
Receives Multicast (NIO card only) — The Receives Multicast field
indicates the total number of frames received that were addressed to a
multicast address. If no multicast frames are being received, check to
make sure that the desired multicast address(es) are listed as part of
the current multicast addresses.
Heartbeat losses — The Heartbeat losses field indicates that no SQE
heartbeat was seen after a transmission and when IEEE 802.3 stub
cable was connected. After a successful transmission, the 802.3 MAU
sends an SQE message, called a “heartbeat,” through the Control In
wire of the AUI. This heartbeat function lets the card know that the
MAU is still functioning properly.
NOTE This statistic is not to be set if the Ethernet stub cable is connected.