User's Manual

Managing the Radio | 97
Aprisa SR User Manual
Radio > Channel Setup
CHANNEL SETTINGS
Access Scheme
This parameter sets the Media Access Control (MAC) used by the radio for over the air communication.
Option
Function
Access Request
Channel access scheme where the base stations controls the
communication on the channel. Remotes ask for access to the
channel, and the base station grants access if the channel is not
occupied. This mode is a general purpose access method for high
and low load networks.
Listen Before Send
without
Acknowledgement
Channel access scheme where network elements listen to ensure
the channel is clear, before trying to access the channel. This
mode is optimised for low load networks and repeated networks.
Acknowledgements are disabled.
Listen Before Send
with
Acknowledgement
Channel access scheme where network elements listen to ensure
the channel is clear, before trying to access the channel. This
mode is optimised for low load networks and repeated networks.
With Acknowledgement, unicast requests from the remote station
are acknowledged by the base station to ensure that the
transmission has been successful. If the remote station does not
receive an acknowledgement, then random back-offs are used to
reschedule the next transmission.
Enabling acknowledgments increases reliability of transport but
reduces available channel capacity so if application has the
capability to handle lost or duplicate messages, the Access Scheme
should be set to Listen Before Send without Acknowledgement.
The default setting is Access Request.