User's Manual
Spread Spectrum Wireless Data Transceiver User Manual
LUM0002AF Rev E Version 6.3 36
WARNING: FCC regulations require a minimum of 50 separate frequency channels be used within a
hop pattern. Using the Standard hop table, a minimum of 5 frequency zones are required
for legal communication.
(1) MAX PACKET SIZE AND (2) MIN PACKET SIZE
The Max and Min Packet Size settings and the RF Data Rate determine the number of bytes in the
packets. Throughput can be enhanced when packet sizes are optimized. In Point-to-Point mode, the Max
and Min Packet Settings will not have material impact on throughput unless 115.2 KBaud is desired.
However, this may have an impact on latency. For example, if small amounts of data are sent and large
packet sizes are selected, a certain amount of time “wasted” between each packet would be seen.
The following 3 tables provide the information to determine optimum setting values.
The default settings for Max and Min packet size and RF Data Rate are 8, 9, and 3, respectively.
The following table defines the Minimum packet size in bytes by way of charting the Min Packet Size
setting versus the RF Data Rate setting. Using the default settings, the actual minimum packet size, in
bytes, is 44.
Minimum Packet Size Definition
Min
Setting
Min Packet Size
RF Data Rate = 2
Min Packet Size
RF Data Rate = 3
0 15 8
1 21 12
2 26 16
3 31 20
4 37 24
5 42 28
6 47 32
7 53 36
8 58 40
9 63 44
The following table defines the Maximum packet size in bytes by way of charting the Min Packet Size
setting versus the Max Packet Size setting where the RF Data Rate is set to 2.
Maximum Packet Size Definition with RF Date Rate of 2
Max Setting
Min Setting 0 1 2 3 4 5 6 7 8 9
0
15 37 58 79 101 122 143 165 186 207
1
21 42 63 85 106 127 149 170 191 213
2
26 47 69 90 111 133 154 175 197 218
3
31 53 74 95 117 138 159 181 202 223
4
37 58 79 101 122 143 165 186 207 229
5
42 63 85 106 127 149 170 191 213 234
6
47 69 90 111 133 154 175 197 218 239
7
53 74 95 117 138 159 181 202 223 245
8
58 79 101 122 143 165 186 207 229 250
9
63 85 106 127 149 170 191 213 234 255