ARRIS TG1672G-NA Web GUI User Guide - Manual (Page 62)

Touchstone 16xx Gateway Router Setup – Web GUI User’s Guide
Page 62 of 96 November 2013
Channel Bandwidth – Sets the 802.11n Channel Bandwidth. Options are 20 MHz or 20/40 MHz.
The default setting is 20/40 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 – The spacing between transmission of symbols in nanoseconds. Can be set to
AUTO, 400ns or 800ns. The default is AUTO. 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).
MCS – Sets the 802.11n Modulation and Coding Scheme to be used. Options are 1 through 23
Legacy and AUTO. The default is AUTO. The 802.11n standard defines a total of 77 MCS. Each
MCS specifies a certain modulation type (BPSK, QPSK, 64-QAM), coding rate (1/2, 3/4), guard
interval (800 or 400ns), and number of spatial streams. Support for MCS 0 - 15 is mandatory for
802.11n access points while support for MCS 0 - 7 is mandatory for 802.11n clients.