User's Manual

Adaptive Modulation
95
Horizon Compact Plus Release 1.0.1 Wireless Ethernet Product User Manual – Volume 2
By default, the transmit power will remain the same as that allowed for the 256QAM modulation
scheme, regardless of the modulation scheme currently operating. However, a maximum power can be
configured so that power levels will not exceed this figure, regardless of the modulation scheme
operating.
As conditions improve the SNR will increase. When the “Up SNR” thresholds are exceeded, then
modulation upshift will occur. This will occur in steps as the “Up SNR” threshold for each modulation
scheme is exceeded and until the 256QAM modulation scheme is reached.
HAAM is supported by all radio bands available to the Horizon Compact Plus, however, some
jurisdictions may not allow its use.
There are ten CLI commands associated with HAAM:
get haam
get haam system modes*
get haam status
get haam wtr**
set haam [on/off]
set haam wtr**
set haam manual mode [on/off]
get haam eoam option
diagnose haam [up/down]
set haam eoam option
*Definiton – haam system modes – the modes supported by both haam and the configured radio band.
**Definition - haam wtr - the wait to restore time in seconds is applicable in the lower mode. It is the
minimum time the system has to spend in the lower modulation. When the system enters the lower
mode the wtr timer is started. If the link improves within this time, the modulation is not shifted to a
higher modulation scheme until this time has expired
The CLI commands are demonstrated in the procedure below:
Procedure 16-1
Configuring Hitless Automatic Adaptive Modulation
Required Action
Steps
login
Log in as a NOC user.
Check if haam is on or off
Displays the current on/off condition of Hitless Automatic Adaptive
Modulation (HAAM).
Sequence:
get haam press Enter
The system responds:
HAAM status: on/off