Technical information

ADC Telecommunications, Inc.
500 C
HAPTER 18: CONFIGURING AND MONITORING CABLE MODEM TERMINATION SYSTEMS
Slot Size Number of 6.25 microsecond ticks in each upstream
minislot. This depends on one selected channel width,
which is automatically set when the user selects an
acceptable channel width. By default, the Slot Size is set
at 2.
WARNING: The slot size affects the performance of the
CMTS. It is recommended that configuration is done by
an expert-level administrator.
Following are recommended minislot values for
different channel widths:
■ 2 (3200 kHz)
■ 4 (1600 kHz)
■ 8 (800 kHz)
■ 16 (400 kHz)
■ 32 (200 kHz)
Receive Power Receive power level from the CMTS for the upstream
interface from the cable modem. By default, the
Receive Power is set at 0, which is the optimal setting
for the upstream power level. Acceptable values are
-160 to 260 TenthdBmV. The Receive Power is
dependent on the selected channel-width.
Voice Bandwidth
Reservation (%)
Specify the percentage of bandwidth reserved for UGS
and UGS/AD service flows. Acceptable values range
from 0.0 to 100.0%. The default is set to 75.0%.
Modulation Profile Profile Index number that identifies the properties of
the Upstream Channel ID.
TX Timing Offset Read-only. A measure of the maximum round-trip time
between a cable modem and the CMTS on this
upstream channel.
TX Backoff Start Sets a fixed start value for initial data backoff on the
upstream ports. By default, the TX Backoff Start is set to
5. Acceptable values are 0 to 15.
TX Backoff End Sets a fixed end value for initial data backoff on the
upstream ports. By default, the TX Backoff End is set to
10. Acceptable values are 0 to 15.
Ranging Backoff Start Sets the fixed start value for range backoff on the
upstream ports. By default the value is set to 2.
Acceptable values are 0 to 15.
Parameter Description