Cisco Broadband Cable Command Reference Guide

cable upstream hop-priority
cable upstream hop-priority
Syntax Description
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Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
To configure the priority of the corrective actions to be taken when a frequency hop is necessary due to
ingress noise on the upstream, use the appropriate cable upstream hop-priority command in cable
interface configuration mode.
cable upstream n hop-priority frequency modulation channel-width
cable upstream n hop-priority modulation frequency channel-width
cable upstream n hop-priority frequency channel-width modulation
Defaults The default priority is frequency, modulation, and channel-width.
Command Modes Interface configuration (cable interface only)
Command History
n Specifies the upstream port. Valid values start with 0 for the first
upstream port on the cable interface line card.
frequency, modulation,
channel-width
Specifies the priority of corrective actions to be taken when ingress
noise occurs on a downstream.
Note The channel-width option must come after the frequency
option, either immediately or after the modulation option, as
shown in the above examples.
Release Modification
12.1(7)CX1 This command was introduced for Cisco uBR7200 series routers
using the Cisco uBR-MC16S cable interface line card.
12.2(8)BC2 Support was added for the Cisco uBR10012 router and the
Cisco uBR-LCP2-MC16S cable interface line card.
Usage Guidelines This command specifies the priority of the corrective actions that should be taken when a frequency hop
is necessary to correct excessive ingress noise on an upstream. For example, if the upstream is set for the
default settings (frequency, modulation, and channel-width), the following occurs when the upstream
noise exceeds the CNR threshold value for the current modulation profile:
1. The Cisco uBR-MC16S changes to a new frequency, if a clean frequency is available in its spectrum
group.
2. If no clean frequency is available, the Cisco uBR-MC16S uses the Dynamic Upstream Modulation
feature to switch the upstream to the secondary modulation profile.
3. If the noise levels still exceed the CNR threshold value for the secondary modulation profile, and if
the upstream has been configured for a range of channel widths, the Cisco uBR-MC16S narrows the
channel width of the upstream by half. If the noise levels are still excessive, the channel width is
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