Information Technology Reference
In-Depth Information
Table15-9 Show Interfaces Serial Field Descriptions (continued)
Field
Description
collisions
Gives the number of messages retransmitted because of
an Ethernet collision. This usually is the result of an
overextended LAN (Ethernet or transceiver cable too
long, more than two repeaters between stations, or too
many cascaded multiport transceivers). Some collisions
are normal. However, if your collision rate climbs to
around 4 percent or 5 percent, you should consider
verifying that there is no faulty equipment on the
segment, or moving some existing stations to a new
segment. A packet that collides is counted only once in
output packets.
interface resets
Gives the number of times that an interface has been
completely reset. This can happen if packets queued for
transmission were not sent within several seconds. On a
serial line, this can be caused by a malfunctioning modem
that is not supplying the transmit clock signal, or by a
cable problem. If the system notices that the carrier detect
line of a serial interface is up but the line protocol is
down, it periodically resets the interface in an effort to
restart it. Interface resets can also occur when an interface
is looped back or shut down.
restarts
Gives the number of times that the controller was
restarted because of errors.
alarm indications, remote
alarms, rx LOF, rx LOS
Gives the number of CSU/DSU alarms, and the number of
occurrences of receive loss of frame and receive loss of
signal.
BER inactive, NELR
inactive, FELR inactive
Shows the status of G.703-E1 counters for bit error rate
(BER) alarm, near-end loop remote (NELR), and far-end
loop remote (FELR). Note that you cannot set the NELR
or FELR.
Troubleshooting T1 Problems
This section describes the techniques and procedures to troubleshoot T1 circuits for dial-in customers.
Troubleshooting Using the show controller t1 Command
The show controller t1 exec command provides information to logically troubleshoot physical layer and
data link layer problems. This section describes how to logically troubleshoot using the show controller
t1 command.
This command displays the controller status that is specific to the controller hardware. The information
displayed is generally useful for diagnostic tasks performed by technical support personnel.
The NPM or MIP can query the port adapters to determine their current status. Issue a show controller
t1 command to display statistics about the T1 link.
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