User's Manual

WIRELESS

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)