Technical information

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}]