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Page 81 / 106 Scroll up to view Page 76 - 80
81
HITRON BVW-3653 USER’S GUIDE
WIRELESS
FIGURE 32:
The Wireless > Advanced Screen
Page 82 / 106
82
HITRON BVW-3653 USER’S GUIDE
WIRELESS
The following table describes the labels in this screen.
TABLE 31:
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 BVW-
3653 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 BVW-3653 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 BVW-3653 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.
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 BVW-3653 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 BVW-3653 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.
Page 83 / 106
83
HITRON BVW-3653 USER’S GUIDE
WIRELESS
WMM Configuration
Click this to set up your Wifi Multimedia (WMM) Quality
of Service (QoS) settings. See
Configuring WMM
Parameters
on page
86
for information on the screen
that displays.
NOTE:
Turn WMM on and off in the
Wireless
>
Basic
Settings
screen.
HT Physical Mode
Operating Mode
Use this field to configure how the BVW-3653 transmits
in IEEE 802.11n mode.
Greenfield mode
, 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.
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.
Channel Bandwidth
This field allows you to configure the width of the radio
channel the BVW-3653 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 31:
The Wireless > Advanced Screen (continued)
Page 84 / 106
84
HITRON BVW-3653 USER’S GUIDE
WIRELESS
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 BVW-3653 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 BVW-3653
supports MCS 0~15, and 32.
Select the MCS that you wish to use for 802.11n
transmissions. If unsure, select
Auto
(default).
Reverse Direction
Grant (RDG)
Use this field to configure Reverse Direction Grant in
IEEE 802.11n transmissions.
Each data transfer requires that the wireless station
initiating the transfer acquires permission from the
access point to perform the transfer. This is known as a
transmission opportunity, or TXOP. Each TXOP is time-
limited; the initiating station may transmit for only a
certain length of time, and then must cease.
Normally, if the receiving station wishes to return data to
the initiating station, it must also acquire its own TXOP.
However, when you enable Reverse Direction Grants, a
wireless station that has already obtained a TXOP may
issue a Reverse Direction Grant to the receiving station.
This allows the receiving station to transmit data back to
the initiating station for the remaining time specified in
the original TXOP. It does not need to acquire its own
TXOP.
±
Select
Disable
to disallow Reverse Direction Grants.
±
Select
Enable
to allow Reverse Direction Grants.
TABLE 31:
The Wireless > Advanced Screen (continued)
Page 85 / 106
85
HITRON BVW-3653 USER’S GUIDE
WIRELESS
Extension Channel
This field displays the secondary wireless radio channel
that the BVW-3653 uses for channel bonding (combining
two channels for faster data transfer) in IEEE 802.11n
transmissions.
NOTE:
At the time of writing, you cannot select the
Extension channel
. It is selected automatically
by the BVW-3653.
Aggregation MSDU
(A-MSDU)
Use this field to control whether the BVW-3653 supports
Aggregation MSDUs (A-MSDUs) in IEEE 802.11n
transmissions.
Each A-MSDU consists of multiple MSDUs, added
together (aggregated) to create one large packet. This
reduces the overhead associated with transmission, but
can result in a reduced data rate if your network suffers
from a high error rate since each lost A-MSDU will
require retransmission.
±
Select
Disable
to not use A-MSDUs.
±
Select
Enable
to use A-MSDUs.
Auto Block ACK
Use this field to control how the BVW-3653 sends
acknowledgement (ACK) requests in IEEE 802.11n
transmissions.
Normally, an ACK request is sent after every data or
management frame in order to ensure that it has been
received correctly. However, when you enable
Auto
Block ACK
the BVW-3653 sends a burst of multiple
frames together, and follows it with a single, block ACK
request.
±
Select
Disable
to not use block ACKs.
±
Select
Enable
to use block ACKs.
NOTE:
Block ACK can increase your network’s speed,
as fewer ACK messages are sent. However, you
should not use it if your network is prone to
interference, since if the transmitting station
needs to retransmit information, the required
retransmission will be much longer.
Decline BA Request
Use this field to control how the BVW-3653 receives
acknowledgement (ACK) requests in IEEE 802.11n
transmissions.
Select
Disable
to accept block ACK requests. The
transmitting device may then send multiple data frames
together, followed by the block ACK request.
Select
Enable
to decline block ACK requests. The
transmitting device must then follow each data frame
with an ACK request in the traditional manner.
TABLE 31:
The Wireless > Advanced Screen (continued)

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