WIRELESS
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
100
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
100
HITRON CGN USER’S GUIDE
Guard Interval
In 802.11n networks, the guard interval is the amount of
time that elapses between the transmission of symbols.
This is to prevent Inter-Symbol Interference, or ISI,
caused by echoes.
NOTE:
In modulated signals, each distinct modulated
character (for example, each audible tone
produced by a modem for transmission over
telephone lines) is known as a symbol.
Select
Long
to use a long guard interval of 800
nanoseconds.
Select
Short
to use a short guard interval of 400
nanoseconds.
MCS
Use this field to configure the Modulation and Coding
Scheme (MCS) that the CGN uses for IEEE 802.11n
transmissions.
The 802.11n protocol specifies 77 Modulation and
Coding Schemes. Each MCS refers to a combination of
a modulation technique, a coding rate, a guard interval,
and a certain number of spatial streams. The CGN
supports MCS 0~15, and 32.
Select the MCS that you wish to use for 802.11n
transmissions. If unsure, select
Auto
(default).
Table 29:
The Wireless > Advanced Screen (continued)
