FreeWave Technologies Inc. 1521131FFF 사용자 설명서
Spread Spectrum Wireless Data Transceiver User Manual
LUM0002AG Rev A
Version 7.0
33
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.
for legal communication.
For more information, contact FreeWave Technical Support at (303) 381-9200.
F
REQ
K
EY IN
1.4GH
Z
T
RANSCEIVERS
Please see Addendum LAD0012xx Add User Mnl 1.4GHz V1.0c for a list of frequencies and instructions
on setting up a single frequency for the LRS140 series radios.
on setting up a single frequency for the LRS140 series radios.
(1)
M
AX
P
ACKET
S
IZE AND
(2)
M
IN
P
ACKET
S
IZE
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.
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.
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