User`s guide

ARRIS Router Setup – Web GUI User’s Guide
Page 16 of 95 May 2012
- Note that Security Mode WEP and WPA are not compatible with the 802.11n
standard. Performance would be limited to 802.11g speeds of 54mbps. Also,
802.11n requires WPA2 and AES.
 Wireless Mode
- Set your wireless mode to optimize performance based on the type of network
adapters being used by your network devices, e.g., 802.11b, 820.11g, and 802.11n.
Select the proper mode to support all of the wireless devices that will connect to
your router. It’s best to have an environment with only one standard and set the
Gateway to that standard. Since this is not always feasible, ONLY include the
standards that are used in your environment.
- The presence of 802.11b devices in an active network will cause the greatest
performance degradation.
 BG Protection
- This option allows you to properly operate 802.11b client devices in 802.11g
networks. These older 802.11b devices required the unit to add overhead to most
transmissions. For firmware releases prior to 7.5.32C, performance will increase if
no 802.11b devices are present and this feature is disabled (OFF). For firmware
release 7.5.32C, the unit will auto detect 802.11b devices and set the feature
accordingly when the BG protection checkbox is checked (AUTO).
 Operation Mode
- The options are Mixed mode or Greenfield. Select Mixed mode if you network
consists of a mix of 802.11 b, g, and n clients. Select Greenfield if your network
consists of ONLY 802.11n clients. The Greenfield mode improves efficiency of
networks using only 802.11n devices by eliminating support for the 802.11a/b/g
client devices.
 Channel Bandwidth (802.11n only)
- Options are 20 MHz or 20/40 MHz. The default setting is 20 MHz. If your wireless
network is in a very clean RF environment setting the Channel Bandwidth to 20/40
will increase your throughput by “bonding” two channels. However, if there are any
other wireless routers or access points within range of the device it will stay in 20
MHz bandwidth regardless of this setting. This is a WiFi Alliance requirement. (You
can verify the channel bandwidth by using the previously mentioned wireless
network scanning software, MetaGeek’s inSSIDer.)
 Guard Interval (802.11n only)
- This is the time in nanoseconds between symbols for 802.11n frames. Selecting
400ns provides higher throughput in networks where the coverage distance is small
(indoors). Selecting 800ns provides higher throughput in networks where the
coverage distance is large (outdoors).