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Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 1

Cisco uBR7200 Series MC16S Cable

Modem Card Spectrum Management

Spectrum Management Overview

The following sections describe spectrum management implementation using Cisco uBR7200 series

software and the Cisco MC16S cable modem card.

The Cisco uBR7200 series supports the creation of up to 32 cable spectrum groups, allowing

multiple upstream ports in a single spectrum group, and speciﬁcations of conﬁgured channel widths

for upstream segments. Upstream frequencies can be assigned as follows:

• Fixed.

• Single subband—the CMTS administrator can deﬁne a center frequency and symbol rate such

that the boundaries of the upstream carrier stay within the subband. The frequency and symbol

rate can change within the boundary in response to noisy line conditions, based on the deﬁned

upstream parameters.

• Multiple subbands—the data carrier can remain in a particular subband for a duration of time and

then hop to another subband based on the deﬁned upstream parameters.

Note The above frequency agility speciﬁcations are based on predetermined sets of frequencies

which may or may not have adequate carrier-to-noise (C/N) ratio at any given time.

• Dynamically assigned based on a CMTS administrator-speciﬁed threshold percentage of

disconnected cable modems that must be met before a frequency hop will occur—the

Cisco uBR7200 series software can initiate a frequency hop to a clean upstream channel based

on upstream spectrum data collected by the MC16S’s spectrum management daughter card.

For more information regarding the MC16S cable modem card and its frequency hopping

capabilities, refer to the “MC16S Cable Modem Card” section on page 12.

Caution Upstream modulation proﬁles can be assigned to speciﬁc upstream ports based on the

Cisco cable modem card used. Only those familiar with DOCSIS who have received the proper

training should create upstream modulation proﬁles.

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Inhaltsverzeichnis

Seite 1 - Spectrum Management Overview

Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 1Cisco uBR7200 Series MC16S CableModem Card Spectrum ManagementSpectrum Management Ov

Seite 2 - Two-Way Cable

Spectrum Management Overview1012.0(7)XR2Speciﬁes the spectrum group number. (The valid range is 1 to 32.)If the time parameter is present, then the fr

Seite 3

Two-Way Cable Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 11“Shared” indicates that upstream ports must share the same spectrum, a

Seite 4 - Frequency Management Policy

Spectrum Management Overview1212.0(7)XR2Enable frequency agility and spectrum management of the upstream frequency and power. Theglobal spectrum group

Seite 5 - RF Topology Example

Benefits Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 13Checking Your Settings and Reviewing Your Conﬁguration ChangesYou can check

Seite 6

Supported Platforms1412.0(7)XR2Related Features and TechnologiesTable 1 lists the Cisco IOS universal broadband router features related to the scope o

Seite 7

Supported Standards, MIBs, and RFCs Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 15MIBsTable 2 lists the MIBs necessary to support

Seite 8 - Upstream Frequency Migration

Command Reference1612.0(7)XR2Command ReferenceThis section documents commands necessary to conﬁgure upstream cable interfaces for spectrummanagement.

Seite 9 - Global Conﬁguration

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 17cable modulation-proﬁ

Seite 10

Command Reference1812.0(7)XR2DefaultModulation proﬁle 1Command ModeGlobal conﬁgurationCommand HistoryExampleThe following example to speciﬁes a FEC co

Seite 11 - Interface Conﬁguration

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 19cable spectrum-groupF

Seite 12

Spectrum Management Overview212.0(7)XR2Two-Way CableThe Cisco uBR7200 series universal broadband routers divide a cable network into downstream andups

Seite 13 - MC16S Cable Modem Card

Command Reference2012.0(7)XR2DefaultNone.Command ModeGlobal conﬁgurationCommand Historyparameter The spectrum group values that can be changed or adde

Seite 14 - Supported Platforms

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 21ExampleSee the follow

Seite 15

Command Reference2212.0(7)XR2Related CommandsCommand Descriptioncable modulation-proﬁle Speciﬁes the center frequency for a given upstream cable inter

Seite 16 - Command Reference

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 23cable upstream channe

Seite 17 - Syntax Description

Command Reference2412.0(7)XR2Default1600000 (1280 Ksymbols/sec)Command ModeCable interface conﬁgurationCommand HistoryExampleSee the following example

Seite 18 - Related Commands

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 25cable upstream freque

Seite 19

Command Reference2612.0(7)XR2See the following example to specify a center frequency of 24.016 MHz on upstream interfaceport 0:Router(config-if)# cabl

Seite 20

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 27cable upstream hoppin

Seite 21

Command Reference2812.0(7)XR2cable upstream hopping blind Conﬁgures preset modulation proﬁles that you can apply to one or moreupstream cable interfac

Seite 22

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 29cable upstream power-

Seite 23

Two-Way Cable Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 3Upstream SignalsThe upstream channel is characterized by many cable mod

Seite 24

Command Reference3012.0(7)XR2Command HistoryExampleThe following example conﬁgures a power level of 2 dBmV to upstream cable interface 0:Router(config

Seite 25

Configuring Spectrum Management on an Upstream Cable Interface Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 31cable upstream shutdo

Seite 26

Debug Commands3212.0(7)XR2Related CommandsDebug CommandsThis section documents the new debug cable hw-spectrum command. All other commands usedwith th

Seite 27

debug cable hw-spectrum Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 33debug cable hw-spectrumTo display debug messages for spectru

Seite 28

Debug Commands3412.0(7)XR2

Seite 29

Spectrum Management Overview412.0(7)XR2Frequency Management PolicyDue to the nature of CATV technology, upstream noise management is a signiﬁcant issu

Seite 30

Two-Way Cable Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 5Spectrum Management Conﬁguration GuidelinesThis section presents tips,

Seite 31

Spectrum Management Overview612.0(7)XR2In this example, ten combiner groups are served with frequency hop tables from three spectrumgroups:Cable3/0DS

Seite 32 - Debug Commands

Two-Way Cable Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 7• Spectrum Group 1—This group is non-shared. Upstream RF domains exist

Seite 33

Spectrum Management Overview812.0(7)XR2For example, if the allocation is from 20.0 to 28.0 MHz and an upstream port has its channel widthset to 0.2 MH

Seite 34 - 12.0(7)XR2

Two-Way Cable Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 9The system will not hop endlessly, because one cable modem is generatin