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show interface cable upstream
Table 3-61 show interface cable upstream Field Descriptions (continued)
Field
unknown protocol
packets input
corrected
uncorrectable
noise
microreflections
Guaranteed-rate service queue
depth
Best-effort service queue depth
Total Modems On This
Upstream Channel
Cisco Broadband Cable Command Reference Guide
3-246
Description
Number of packets received that were using an unknown protocol
(the packet was not an IP, ARP, or PPPoE packet). This counter also
includes DOCSIS frames that could not be identified as DOCSIS
frames because of malformed headers or invalid header options.
Number of frames received (broadcast, multicast, and unicast)
through this upstream interface that were free from errors.
Number of frames received through this upstream interface that
had errors that were corrected.
Number of frames received through this upstream interface that
had errors that could not be corrected. This means the frame had at
least one uncorrectable FEC block, making the whole frame
uncorrectable. Nominally, you should expect at most 1
uncorrectable error per 10,000 packets, and typically, the
uncorrectable error rate is much less in good environments.
This counter is not supported on Broadband Processing
Note
Engines (BPE) cable interface line cards, such as the
Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and
Cisco uBR-MC5X20S/U cards, because these cards count
only uncorrectable codewords, not frames. As a result, this
field always shows 0 or N/A for these cards, depending on
the software release. Instead of this field, use the
cable hop
command to display the number of
uncorrectable errors per codeword.
Number of upstream packets of any type that were corrupted by
line noise.
Approximate number of upstream packets corrupted by
microreflections. Microreflections are a type of impairment that is
caused by impedance mismatches between amplifiers, couples,
cables, and other equipment in the cable plant. Microreflections
create copies of a signal that arrive at the receiver with different
amounts of delay and attenuation, generating intersymbol
interference (ISI) that can cause the receiver to improperly detect
the amplitude and phase of the incoming signal.
This value is not exact but provides an approximate
Note
indication of the microreflections that have been received.
Number of bandwidth requests queued up in the Guarantee-rate
queue. This queue is available only to CMs that have a reserved
minimum upstream rate in their class of service (CoS).
Number of bandwidth requests queued up in the Best-effort queue.
This queue is available to all CMs that do not have any reserved
rate on the upstream.
Number of CMs currently sharing this upstream channel. This field
also shows how many of these CMs are active.
Chapter 3
Cisco CMTS Show Commands
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OL-1581-08
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