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

Appendix A 213
LINKCONTROL Command
NS 3000/iX 100Base-T Link Statistics
Carrier losses — This field indicates that the transmitting node
turned off the carrier signal on the cable. A carrier loss occurs when a
receive carrier was not detected after a slottime from the start of
transmission. The carrier must be present continuously from the start
until the end of transmission to prevent an error. If the 100Base-T link
continuously loses carrier, the problem is probably caused by a faulty
hub or cable, or a disconnected cable somewhere else within the
network, along the path between the target nodes. 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.
NOTE The PCI 100Base-T adapter card reports both “loss of carrier” (during
transmission) and “no carrier” (no carrier detected at start of
transmission) as distinct events. For PCI, the “carrier losses” statistic
represents the sum of the “no carrier” and “loss of carrier” events.
Trans jabber timeouts — The number of times the adapter card
transmitted onto the LAN for too long, and had to be forced to stop. This
should only occur if the adapter card or hub are faulty. The maximum
value of this 32-bit field is 2147483647. This statistic is displayed for
PCI 100Base-T only.
Link disconnects — Number of times the link driver noticed the link
had previously been established, but was no longer up. This may occur
because the cable was unplugged, the hub was powered off, the hub
automatically requested a reconnect, or normally (at link shutdown
time). This total does not include repetitive, failed attempts by the link
driver to reestablish the link. The maximum value of this 32-bit field is
2147483647.
Link speed — Maximum link speed (either 100 or 10) in million bits
per second, the link is currently configured to operate at. When
displaying a 100Base-T link operating in 100Base-T mode, this value
will always be 100. When a 100Base-T link is operating in 10Base-T
mode, this value will always be 10.
Link mode — Electrical mode the link is currently operating at. When
displaying a 100Base-T link operating in 100Base-T mode, this value
will always be “100Base-T”. When it is operating in 10Base-T mode,
this value will be “10Base-T”. For PCI, the type of card (e.g., “Addon”)
may also be shown here.
Receive bytes — Total number of bytes successfully received over the
medium. This includes unicast, multicast, broadcast, and that were
successfully received on the first attempt, as well as frames that were
successfully received after being deferred or that experienced one or
more collisions. The maximum value of this 64-bit field is 17 digits, or
about 99 million Gbytes. In the previous example, 495 million bytes
were received, or about 472 Mbytes.