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Page 96 / 113 Scroll up to view Page 91 - 95
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
96
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
96
HITRON CGN2 USER’S GUIDE
Figure 31:
The Wireless > Advanced Screen
Page 97 / 113
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
97
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
97
HITRON CGN2 USER’S GUIDE
The following table describes the labels in this screen.
Table 29:
The Wireless > Advanced Screen
Wireless Advanced Settings
BG Protection Mode
Use this field to configure IEEE 802.11b/g protection.
Both 802.11b and 802.11g wireless communications
occur at the same radio frequencies. When the CGN2 is
wirelessly connected to 802.11b clients and 802.11g
clients simultaneously, the performance of the link to
802.11g clients can deteriorate due to the presence of
the 802.11b clients. Because 802.11b and 802.11g use
different modulation techniques, 802.11b clients do not
understand 802.11g’s Request To Send (RTS) and
Clear To Send (CTS) messages, which ensure that each
wireless device transmits only when other devices are
not transmitting.
When B/G protection is active, the CGN2 prevents
802.11b clients transmitting over 802.11g transmissions
by first transmitting an announcement (known as a CTS-
to-Self) to 802.11b clients, stating that it intends to
transmit to 802.11g clients.
Select
Auto
to have the CGN2 control whether B/G
protection is active or not.
Select
Always-on
to use B/G protection at all times.
Select
Always-off
to never use B/G protection.
Page 98 / 113
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
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Version 2.0, February 2012. Copyright
2012 Hitron Technologies
98
HITRON CGN2 USER’S GUIDE
IGMP Snooping
Use this field to turn Internet Group Management
Protocol (IGMP) snooping on or off.
IGMP is used to manage multicast groups. In multicast
groups, data is transmitted to numerous IP addresses
simultaneously. This is the most efficient method of
providing the same data to many different recipients at
the same time, since each data packet needs to be sent
only once. Multicast groups are often used for Internet
TV and real-time streaming applications such as online
gaming.
IGMP snooping allows the CGN2 to “snoop” or listen in
on IGMP traffic, and to determine which computers on
the LAN belong to which IGMP groups. By keeping lists
of which computers belong to IGMP groups, the CGN2
can send the IGMP data to only those computers that
have requested it, and can refrain from sending
unsolicited multicast data. This can improve your
connection to wireless clients.
Select
Disable
to turn IGMP snooping off.
Select
Enable
to turn IGMP snooping on.
WMM Configuration
Click this to set up your Wifi Multimedia (WMM) Quality
of Service (QoS) settings. See
Configuring WMM
Parameters
on page
103
for information on the screen
that displays.
NOTE:
Turn WMM on and off in the
Wireless
>
Basic
Settings
screen.
HT Physical Mode
Table 29:
The Wireless > Advanced Screen (continued)
Page 99 / 113
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
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Version 2.0, February 2012. Copyright
2012 Hitron Technologies
99
HITRON CGN2 USER’S GUIDE
Operating Mode
Use this field to configure how the CGN2 transmits in
IEEE 802.11n mode.
Mixed mode
, on the other hand, allows 802.11a/b/g
stations to tell when 802.11n transmissions are
occurring, by transmitting RTS, CTS and CTS-to-Self
messages in a format the legacy stations can
understand. You should select this option if you have
802.11a/b/g stations in your networks, or if there are
other 802.11a/b/g networks in your area.
Green Field
, also known is High Throughput (HT) mode,
assumes that there are no existing IEE 802.11a/b/g
stations using the same radio channel. In greenfield
mode, the 802.11a/b/g stations are unable to tell when
802.11n transmissions are occurring. You should select
this mode only if there are no 802.11a/b/g stations in
your network (or other networks in your location).
Otherwise these stations’ wireless transmissions will
interfere with your 802.11n transmissions. When no
802.11a/b/g stations are present, greenfield mode
allows greater wireless network speeds, because the
legacy messages (RTS, CTS and CTS-to-Self) do not
need to be sent.
Channel Bandwidth
This field allows you to configure the width of the radio
channel the CGN2 uses to communicate with its
wireless clients (IEEE 802.11n only). Using the full
40MHz bandwidth can double your data speed.
Select
20
to only use a 20 megahertz band.
Select
20/40
to use a 40 megahertz band when
possible, and a 20 megahertz band when a 40Mhz
band is unavailable.
Table 29:
The Wireless > Advanced Screen (continued)
Page 100 / 113
Version 2.0, February 2012. Copyright
2012 Hitron Technologies
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Version 2.0, February 2012. Copyright
2012 Hitron Technologies
100
HITRON CGN2 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 CGN2 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 CGN2
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)

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