Cambium Networks cnReach N500 User Manual page 128

cnReach N500 User Guide
Attention
Max Payload Bytes is one of the most frequently mis-configured parameters in a cnReach
and setting an invalid value will cause the link to not pass traffic. Please review this
section and make sure to reference the appropriate table for the band and channel size
that you are deploying.
Software release 5.2.16h and later incorporates some error-checking to reduce the
occurrence of this mis-configuration.
The following tables are used to identify the minimum packet size that can be used. Note that there are
different tables for each band and for each channel size. Please ensure that you are using the correct
table. The tables are used as follows:
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. Setting the max payload
size SMALLER than this value will cause the link to NOT operate.
Examples of using the Minimum Max Payload Size Tables
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.
phn-4673_002v000 (March 2018)
3-16
Technical Reference