NETGEAR D8500 User Manual page 221

5. Enter the settings as described in the following table.
Except where indicated, the descriptions in the table apply to both the Advanced Wireless Settings (2.4GHz
b/g/n) section, Advanced Wireless Settings (5GHz-1 a/n/ac) section, and Advanced Wireless Settings (5GHz-
2 a/n/ac) section.
Field
Enable 20/40 MHz
Coexistence
Fragmentation Length
(256-2346)
CTS/RTS Threshold (1-2347)
Preamble Mode function of the modem router unexpectedly.
6. Click the Apply button.
Your settings are saved.
AC5300 WiFi VDSL/ADSL Modem Router Model D8500
Description
By default, 20/40 MHz coexistence is enabled to prevent interference between
WiFi networks in your environment at the expense of the WiFi speed. If no other
WiFi networks are present in your environment, you can clear the Enable 20/40 MHz
Coexistence check box to increase the WiFi speed to the maximum supported speed.
20/40 MHz coexistence applies to the 2.4 GHz band only.
The fragmentation length (the default is 2346), the CTS/RTS threshold (the default
is 2347), and the preamble mode (the default is Long Preamble) are reserved for
WiFi testing and advanced configuration only.
Do not change these settings unless directed by NETGEAR support or unless you are sure
what the consequences are. Incorrect settings might disable the WiFi
Manage the Advanced WiFi Features
221