ADC Cuda 12000 Informations techniques télécharger pdf (Page 260)

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ADC Telecommunications, Inc.

256 CHAPTER 2: CUDA 12000 BASE SYSTEM COMMANDS

modulation-profile

Modulation profiles contain the burst profile properties for the Cuda 12000 upstream data

stream channels. By default, the Cuda 12000 supports two profiles for the four upstream

channels (for 1x4 modules) or six upstream channels (for 1x6 modules). Each modulation profile

defines a burst descriptor for the following Interval Usage Codes:

■ Request — Interval when a request on bandwidth can be sent by the modem.

■ Initial Maintenance — Interval when new modems can start establishing a connection to

the CMTS with Initial Ranging Requests.

■ Station Maintenance — Interval when modems perform periodic ranging with periodic

ranging fro adjusting power, timing and frequency.

■ Short Data — Interval when a modem can send an upstream PDU which is shorter than the

defined maximum burst size.

■ Long Data — Interval when a modem can send a larger data PDU.

Mode

root

interface <type> c/s/i

Syntax

modulation-profile <profile number>

interval-usage {initial | long | request | short | station}

[fec-tbytes <number>]

[fec-len <number>]

[burst-len <number>]

[mod {16qam | qpsk}]

[scrambler]

[no scrambler]

[diff]

[no diff]

[seed <number>]

[pre-len <number>]

[last-cw {fixed | shortened}]

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ADC Cuda 12000 Informations techniques Page 260

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ADC Cuda 12000 Informations techniques Page 260

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