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58 ZT8101 User’s Guide
Using the Telnet Console
The Port Utilization screen displays these statistics.
To view port error statistics
1. From the Main Menu, select Network Monitoring | Port Error Packets and press Enter.
2. In the Port field, enter the port number to view.
3. Toggle the Interval field to suspend or a value from 2 seconds to 1 minute. This field sets the
interval at which the error statistics are updated.
4. To clear the statistics and gather new, highlight CLEAR COUNTERS and press Enter.
The screen displays these statistics.
Column Description
Port Identifies the port.
TX/sec Displays the number of packets transmitted per second.
RX/sec Displays the number of packets received per second.
%Util.
Displays the calculated percentage of the bandwidth being used by the device
attached to the port.
Field Description
Rx Frames—Received packets
CRC Error
Alignment. For 10 Mbps ports, the counter records CRC errors (Frame
Check Sequence (FCS) and alignment errors). For 100 Mbps ports, the
counter records the sum of CRC errors and code errors (frames received
with rxerror signal).
Undersize
Small. The total number of frames received that were shorter than 64 octets
long (excluding framing bits, but including FCS octets) and were otherwise
well formed.
Oversize
Long. The total number of frames received that were longer than 1518
octets (excluding framing bits, but including FCS octets) and were otherwise
well formed.
Fragment
Small with alignment error. The total number of frames received that were
shorter than 64 octets in length (excluding framing bits, but including FCS
octets) and had either an FCS or an alignment error.
Jabber
Long with alignment error. The total number of frames received that were
longer than 1518 octets (excluding framing bits, but including FCS octets),
and had either an FCS or an alignment error.
Drop Pkts
Total dropped. The total number of events in which packets were dropped
due to a lack of resources.
Tx Frames—Transmitted packets
ExDefer
Delayed. The number of frames for which the first transmission attempt on a
particular interface was delayed because the medium was busy.
CRC Error
Alignment. For 10 Mbps ports, the counter records CRC errors (FCS or
alignment errors). For 100 Mbps ports, the counter records the sum of CRC
errors and code errors (frames received with rxerror signal).
Late Coll.
Late Collisions. The number of times that a collision is after the allowable
the detection period.