Cisco MC16S Bedienungsanleitung PDF herunterladen (Seite 13)

Benefits

Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 13

Checking Your Settings and Reviewing Your Conﬁguration Changes

You can check your settings and review any changes to your conﬁguration using various software

commands.

To check the value of the settings you have entered, enter the show running-conﬁg command at the

Router# prompt:

Router# show running-config

To review changes you make to the conﬁguration, use the EXEC show startup-conﬁg command to

display the information stored in NVRAM.

Viewing Your System Conﬁguration

You can use a variety of show commands to view information speciﬁc to the hardware and cable

interface conﬁguration on your Cisco uBR7200 series universal

broadband router. Please refer to the conﬁguration notes that accompanied the various components

in your Cisco uBR7200 series for detailed information.

MC16S Cable Modem Card

The MC16S consists of a motherboard (based on the MC16C cable modem card) and an additional

“piggy-back” spectrum management card. The MC16S supports 256 QAM at 40 Mbps downstream

and 16 QAM at 5 Mbps upstream default data rates. The MC16S supports all DOCSIS upstream

channel widths—3.2 MHz, 1.6 MHz, 800 kHz, 400 kHz, and 200 kHz—and the card output is

+42 dBmV +/- 2 dB. In addition, the MC16S features advanced spectrum management capabilities

made possible by hardware and software enhancements.

The MC16S spectrum management daughter card is able to sample the 5-to-42 MHz upstream

spectrum and identify clean channels acceptable for a dynamic frequency hop. When a user-deﬁned

threshold percentage of “ofﬂine” cable modems has been reached, the spectrum management card

takes a snapshot of the available upstream spectrum and then passes this information to the Cisco

IOS software, where it is analyzed for indications of signiﬁcant ingress and/or impulse noise. From

this analysis, the Cisco IOS software draws informed conclusions regarding the “clean” portion(s)

of the upstream frequency spectrum and automatically initiates a frequency hop to a clean upstream

channel. The user-deﬁned threshold value is speciﬁed by a command in the conﬁguration ﬁle of the

Cisco uBR7200 series router.

The advanced spectrum management capabilities of the MC16S include the ability to hierarchically

scan portions of the upstream spectrum for clean channels of varying widths. For more speciﬁc

information on MC16S capabilities and programming, refer to the “Command Reference” section

on page 15.

Beneﬁts

• Gives you the ability to more effectively manage the upstream frequency spectrum due to fewer

cable modems falling “ofﬂine” because of excessive noise in one area of the upstream frequency

spectrum

• Takes advantage of frequency hopping to a center frequency over a range of different frequencies

• Provides more reliable two-way data transmission

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Cisco MC16S Bedienungsanleitung Seite 13