Chapter 22: Channel Bonding
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 702
The show interface cable-mac command provides the status of the T4 multiplier if enabled. An example of this output is:
Upstream Ranging Poll T4 Multiplier: enabled
TCS Optimization for Static US Bonding Groups
In some circumstances, it may be preferable for the CMTS o reduce the number of channels in the Transmit Channel Set
(TCS) in order to allow the CM to transmit at a higher power level on each channel in cases where signal degradation is an
issue. The TCS Optimization for Static Upstream Bonding Groups feature provides a system operation mode that limits the
size of the TCS based on the number of upstream channels that the modem is using. Currently, the size of the TCS is based
on the size of the fiber node.
By enabling TCS Optimization, the need for additional modem transmission power requirements associated with a larger
TCS is potentially reduced due to the size of the minimized TCS. The feature is disabled by default.
The following two changes occur when a DOCSIS 3.0 modem registers with TCS Optimization enabled:
If D3.0 modem steering is enabled, the static bonded modem's primary US channel is steered via Dynamic Channel
Changing (DCC) to use an ATDMA channel if one exists in the load-balance group. This is regardless of whether or not
that ATDMA channel is already being used by the bonded modem as a non-primary channel.
The TCS is reduced when possible, meaning that after channels have been assigned to service flows (SFs), any channel
that is not being used by any SF will not be included in the TCS. The only exception is the modem’s primary channel
which is where it performed initial ranging.
Note: Dynamic upstream channel bonding must be disabled for the cable-mac associated with the DOCSIS 3.0 modem.
TCS Reduction Enhancement
To provide a reasonable balance of modems across the US channels available on a fiber node, the TCS reduction
enhancement feature supports configuring the TCS size to a number from 1 - 8. The default value is zero which indicates
no limit. The TCS size reduction is configurable on a per cable-mac basis.
Note: It is advisable to enable the Intelligent TCS load balancing when the limiting the size of the TCS to avoid overloading
some US channels.
To limit the size of the TCS, enter the following command:
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