Cisco Remote PHY Device Video Configuration for Cisco 1x2 / Compact Shelf RPD Software 3.1
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- Updated:
- November 24, 2017
Chapter: Remote PHY QAM Profile Configuration
Remote PHY QAM Profile Configuration
This document describes how to configure the QAM profile on the Cisco cBR Series Converged Broadband Router.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.
- Information About QAM Profile
- How to Configure Remote PHY QAM Profile
- Configuration Example
- Feature Information for QAM Profile Configuration
Information About QAM Profile
A QAM profile describes the common downstream channel modulator settings, referred to as physical layer parameters. This includes QAM constellation, symbol rate, interleaver-depth, spectrum-inversion, and annex.
The QAM profile is described by CCAP DownPhyParams object. Default QAM profiles are supported and customized for DOCSIS or MPEG Video, which are described as DocsisPhyDefault and VideoPhyDefault objects, respectively.
A maximum of 32 QAM profiles can be defined. There are four system-defined QAM profiles (0 to 3), which cannot be deleted or modified. You can define profiles 4 to 31.
The system defined profiles are:
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Profile 0 - default-annex-b-64-qam
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interleaver-depth: I32-J4
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symbol rate: 5057 kilo-symbol/second
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spectrum-inversion: off
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Profile 1 - default-annex-b-256-qam
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interleaver-depth: I32-J4
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symbol rate: 5361 kilo-symbol/second
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spectrum-inversion: off
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Profile 2 - default-annex-a-64-qam
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interleaver-depth: I12-J17
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symbol rate: 6952 kilo-symbol/second
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spectrum-inversion: off
Profile 3 - default-annex-a-256-qam
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interleaver-depth: I12-J17
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symbol rate: 6952 kilo-symbol/second
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spectrum-inversion: off
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How to Configure Remote PHY QAM Profile
 Note | To know more about the commands referenced in this section, see the Cisco IOS Master Command List. |
Configuring the QAM Profile on Downstream Channels
Enable
configure terminal
cabledownstream qam-profile Qam_Profile_ID D
annex {A | B | C}
description LINE
interleaver-depth {I12-J17 | I128-J1 | I128-J2 |
I128-J3 | I128-J4 | I128-J5 | I128-J6 | I128-J7 |
I128-J8 | I16-J8 | I32-J4 | I64-J2 | I8-J16}
modulation {256 | 64} spectrum-inversion {off | on}
symbol-rate value
exit
You can configure symbol rate for Annex A video and Annex C video. The valid range for Annex A video is 3500 to 7000 kilo-symbols/sec. The valid range for Annex C video is 3500 to 5309 kilo-symbols/sec. The channel width in kHz is symbol-rate * (1 + alpha) with 0.15 alpha for Annex A and 0.13 alpha for Annex C.
Verifying QAM Profile on Downstream Channels
Use the following commands to verify the QAM Profile on Downstream Channels:
Router#show running-config | section downstream controller-profile cable downstream controller-profile 0 rf-chan 0 3 type DOCSIS frequency 111000000 rf-output NORMAL qam-profile 1 docsis-channel-id 1
Configuration Example
QAM Profile Configuration
configure terminal
cable downstream controller-profile 1
multicast-pool 20
Rf-channel 0 15
Type docsis
Frequency 111000000
Rf-output NORMAL
Qam-profile 1
Docsis-channel-id 1
cable downstream controller-profile 2
multicast-pool 20
Rf-channel 20 47
Type video sync
Frequency 231000000
Rf-output NORMAL
Qam-profile 14
Feature Information for QAM Profile Configuration
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note | The table below lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
QAM Profile Configuration-RPHY Annex B |
Cisco 1x2 / Compact Shelf RPD Software 1.1 |
This feature was introduced on the Cisco Remote PHY Device. |
|
QAM Profile Configuration-RPHY Annex A and C |
Cisco 1x2 / Compact Shelf RPD Software 3.1 |
This feature was introduced on the Cisco Remote PHY Device. |
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