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Command Reference

12.0(3)T

cable downstream modulation

To set the modulation rate for a downstream port on a cable modem card, use the cable downstream

modulation cable interface conﬁguration command:

cable downstream modulation {64qam | 256qam}

Syntax Description

Default

64qam

Command Mode

Cable interface conﬁguration

Command History

Usage Guidelines

Downstream modulation deﬁnes the modulation type used for downstream trafﬁc. Specifying the

symbol rate indirectly inﬂuences the interface speed; at 64qam, the interface speed is

6xx bits/second. Specifying 256qam sets the interface speed to 8xx bits/second.

Example

The following example sets the downstream modulation:

Router(config)# interface cable 6/0

Router(config-if)# cable downstream modulation 256qam

64qam Modulation is 6 bits per downstream symbol rate.

256qam Modulation is 8 bits per downstream symbol rate.

Release Modiﬁcation

11.3 XA This command was ﬁrst introduced.

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Cisco 7246 - uBR Router Manual de usuario Pagina 8