MeshLinx MWI-5000 User Guide
MESHLINX CONFIDENTIAL
8
7.1.5 Transmit
Power
The Transmit Power setting determines the power level in dBm that frames will be
transmitted at. The Transmit Power level must be carefully balanced with the Maximum
Data Rate to avoid distortion. For example, setting the Transmit Power to 25 dBm with
the Maximum Data Rate at 54 Mbps will likely result is distortion and therefore failed
attempts to transmit. Lowering either the Transmit Power or the Maximum Data Rate will
eliminate the distortion, thus a Transmit Power of 25 dBm will work much better with a
Maximum Data Rate of 48 Mbps or 36 Mbps.
If the user wishes to elevate the Transmit Power in order to reach a distant station, it is
likely that the Maximum Data Rate will need to be lowered to avoid distortion.
Normally, this parameter should not be adjusted by the user as it is overridden by the
default Automatic Transmit Power Adjustment setting. See the section on Automatic
Transmit Power Adjustment for more information.
7.1.6 Automatic Transmit Power Adjustment
The Automatic Transmit Power Adjustment parameter determines behavior of the MWI-
5000 device driver with respect to transmit power limitation. It defaults to a setting of
Max54, which ensures that the device driver will never transmit a frame with a transmit
power level too high for the data rate. This setting overrides the Transmit Power value in
dBm.
It is recommended that this parameter be set to Max54 and not modified by the user, as
doing so guarantees the MWI-5000 will never transmit a distorted frame due to an
excessive transmit power level (optimizes range and throughput together).
If the Learn feature is enabled, the process of transmit power adjustment is
continuous and fully automatic. The MWI-5000 monitors all channels and adjusts its
transmit power to accommodate nearby MWI-5000 access points. Needless to say,
enabling Learn is recommended over manual Transmit Power selection.
7.1.7 Digital
Pre-distortion
Digital Pre-distortion is a MeshLinx-proprietary feature that improves transmit efficiency
when used with certain radios. For the Maxim radio in the MWI-5000 production
hardware, this parameter has no effect. Future versions of the MWI-5000 hardware may
use radios where this parameter does have effect and this document will be updated to
advise its use.
