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

Appendix A 217
LINKCONTROL Command
NS 3000/iX 100Base-T Link Statistics
value of this 32-bit field is 2147483647. It would be unusual for this
statistic to contain a nonzero value.
The following receive statistics are only applicable for PCI 100Base-T
links:
Recv watchdg timeout — The number of times the adapter card tried
to receive from the LAN for too long, and had to be forced to stop. This
should only occur if the adapter card, the hub, or another adapter card
on the network, are faulty. The maximum value of this 32-bit field is
2147483647.
Recv collisions — This field indicates that a frame was active in the
network for a longer time than is permitted by the protocol, and
damaged a frame being received. No attempt is made to re-receive a
frame damaged by a late collision. The IEEE 802.3 protocol expects
each frame to be transmitted within one slot time (the expected time for
a 512 bit frame to traverse the entire network). The slot time exceeds
the amount of time a single frame should need to traverse the entire
network.
A value in this field indicates that a network problem caused a late
collision. A late collision is one in which the collision occurs after one
slot time has passed and another node, sensing that the network is
inactive, begins to transmit a frame. Late collisions are caused by one of
the following:
• A network that is too long.
• Broken 100Base-T cards in the network.
A network can be made too long by installing too many repeaters
between nodes. The 100Base-T card hardware detects receive collisions
occurring after the 512 bit timer expires even though IEEE 802.3
standards do not require the link to be monitored beyond that time. The
maximum value of this 32-bit field is 2147483647. This statistic is not
logged when the adapter card is operating in full duplex mode, and
would print as 0. Not applicable to HP-PB.
Link auto sensed — A value of Yes indicates the local adapter card
attempted to autonegotiate its speed and duplex settings, and the
remote side returned a set of remote capabilities to the local adapter
card, meaning the remote also supports the autonegotiation feature.
The “Link speed” and “Link mode” fields report the settings chosen by
the two sides. A value of No indicates the remote side did not return a
set of capabilities although the local adapter card attempted to
autonegotiate, and the “Link speed” and “Link mode” fields report the
driver’s best-guess settings. “No” is also shown when the local adapter
card is configured in NMCONFIG to use fixed speed and duplex
settings.