Cisco MC16E Especificaciones descargar pdf (Pagina 16)

Avg percent minislots lost on

late Maps

Average percent of slots lost because a

MAP interrupt was too late

Total channel bw reserved

Total amount of bandwidth reserved by

all modems sharing this upstream channel

that require bandwidth reservation. The

Class of Service for these modems

specifies some non−zero value for the

guaranteed upstream rate. When one of

these modems is admitted on the

upstream, this field value is incremented

by this guaranteed−upstream rate value.

Note: Check the noise and microreflection counters. They should be very low values and, in a normal cable

plant, increment slowly. If they are at a high value and increment quickly it typically indicates a problem with

the RF plant.

Note: Check for uncorrectable errors. These typically indicate a problem with noise within the RF plant.

Check the received upstream SNR level.

Use the show cable hop command to check the correctable and uncorrectable FEC error counts for a specific

interface or upstream port. Consider that uncorrectable FEC errors result in dropped packets. Correctable FEC

errors are right before uncorrectable FEC errors, and should be considered a warning sign of uncorrectable

errors yet to come. The information from show cable hop describes the frequency hop status of an upstream

port. (Please see the table below for a further information on this output.)

VXR#show cable hop cable 6/1 upstream 0

Upstream Port Poll Missed Min Missed Hop Hop Corr Uncorr

Port Status Rate Poll Poll Poll Thres Period FEC FEC

(ms) Count Sample Pcnt Pcnt (sec) Errors Errors

Cable6/1/U0 20.000 MHz 1000 * * * set to fixed frequency * * * 10 1

VXR#

Upstream

Port

The upstream port for this information line

Port Status

Lists the status of the port. Valid states are down if

frequency is unassigned or administrative down if the port is

shut down. If the port is up, this column shows the center

frequency of the channel.

Poll Rate The rate that station maintenance polls are generated (in

milliseconds).

Missed Poll

Count

The number of missing polls

Min Poll

Sample

The number of polls in the sample.

Missed

PollPcnt The ratio of missing polls to the number of polls, expressed

as a percentage

Hop Thres

Pcnt The level that the missed poll percentage must exceed to

trigger a frequency hop, expressed as a percentage.

Hop Period

Cisco − Determining RF or Configuration Issues On the CMTS

1 2 ... 11 12 13 14 15 16 17 18 19

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