Technical information

ADC Telecommunications, Inc.
538 C
HAPTER 18: CONFIGURING AND MONITORING CABLE MODEM TERMINATION SYSTEMS
Modifying a Profile
For modulation profile security, the first two profiles are default profiles that
are shipped with the Cuda 12000 and may not be modified. Only profiles
that have been added by the network administrator at your cable plant may
be modified.
To copy a modulation profile, follow this procedure:
1. In the Modulation Profiles window, select the row that includes the Profile
Index number you wish to change.
2. Click Modify. The Modulation Profile - Modify window appears.
3. Update information as necessary. Refer to Table 18-23.
4. Click Ok to commit the information or click Cancel to exit without
saving.
Max Burst Size Displays the maximum number of mini-slots that can be
transmitted during a channel's burst time. A value of zero is
transmitted if the burst length is bounded by the allocation
MAP rather than this profile. By default, Max Burst Size is set
to 0 for all interval usage codes.
Guard Time Read only. The number of symbol-times that must follow the
end of this channel's burst. Guard Time is automatically set
based on the Interval Usage Code.
Codeword
Shortened
Check this check box in order to enable the truncation of FEC
codeword. This field is enabled by default.
Scrambler Check this check box in order to enable the scrambler. This
field is disabled by default.
Preamble Offset Read-only. Displays the offset into preamble where value bits,
or pattern, begins.
Parameter Description