Cambium Networks cnReach N500, User Manual

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cnReach N500 User Guide System Configuration
phn-4673_003v000 (November 2018)
2-30
Here is one example of the table showing how to determine the appropriate value. Make sure to
use the correct table as show in Chapter 3: Technical Reference.
ISM – Minimum Packet Sizes with Multi-Speed Multi-Point
The following table charts the smallest “Max Payload Bytes” setting when using multiple ISM End Point
Transmit Rates.
Fastest Modulation
MSK 2FSK BPSK QPSK 8PSK 16QAM 16PSK 32QAM
Kbps 57 114 153
22
663 884 1768 2651 3535 3535 4419
Slo
w
es
t M
od
ula
tio
n
MSK
57
64 165 229 35 1111 1492
114 64 95 15 530 718 1459
153
64 11 396 539 1101
229
64 260 357 737 1118 1498 1498
2FSK 663 64 97 217 337 458 458 578
BPSK
884
64 152 240 328 328 416
QPSK 1768 64 108 152 152 196
8PSK
2651
64 94 94 122
16QAM
3535
64 64 86
16PSK 3535 64 64 86
32QAM
4419
64
1. Find the fastest desired modulation at the top of the chart.
–
2. Find the slowest desired modulation on the left hand side of the chart.
–
3. The box where the column and the row meet is the smallest packet size that must be used for
both Access Point and End Point Max Payload Bytes to establish a connection.
–
4. Multiple modulations can be enabled as long as the smallest packet size corresponds to the
value where the fastest and slowest modulations meet.
Examples
Example 1: ISM
Fastest Modulation: 884Kbps (BPSK), Slowest Modulation 229Kbps (MSK).
Max Payload Bytes must be configured to 357 Bytes or larger.
Example 2: ISM
Modulations enabled: 2651 Kbps (8PSK), 884 Kbps (BPSK), 663 Kbps (2FSK).
Max Payload Bytes must be configured to 337 Bytes or larger.
Example 3: ISM
Fastest Modulation 2651 Kbps (8PSK), Slowest Modulation 153 Kbps (MSK).
This combination of modulation modes will not work.