4RF Aprisa SR+ User Manual - page 87
84 | Managing the Radio
Aprisa SR User Manual
Radio > Channel Access
CHANNEL ACCESS
Access Mode
This parameter sets the Media Access Control (MAC) used by the radio for over the air communication.
Access Mode
Function
Access Request
This mode is a general purpose access method for high and low
load networks
Listen Before Send
This mode is optimised for low load networks and repeated
networks
The default setting is Access Request.
Packet Size (Bytes)
This parameter sets the maximum over-the-air packet size in bytes. A smaller maximum Packet Size is
beneficial when many Remote Stations or Repeater Stations are trying to access the channel. The default
setting is 1550 Bytes.
As radios dispatched from the factory have a Packet Size set to the maximum value of 1550 bytes, if a new
radio is installed in an existing Field Access Network (FAN), the Packet Size must be changed to ensure it
is the same value for all radios in the FAN. The new radio will not register an existing FAN if the Packet
Size is not the same as the other radios in the FAN.