User guide

www.netcomm.com.au
NetComm
3G3
9
W
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HSPA+ WiFi Router
User Guide
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YML39W
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OPTION DEFINITION
BG Protection Mode
A mechanism to enable the router to communicate with older legacy wireless network adapters that use 802.11b
and 802.11g wireless protocols.
Beacon Interval: Interval of time in which the wireless router broadcasts a beacon which is used to synchronize the wireless network.
Data Beacon Rate (DTIM):
Enter a value between 1 and 255 for the Delivery Traffic Indication Message (DTIM). A DTIM is a countdown
informing clients of the next window for listening to broadcast and multicast messages
Fragment Threshold:
This specifies the maximum size of a packet during the fragmentation of data to be transmitted. If you set this value
too low, it will result in bad performance.
RTS Threshold:
When the packet size is smaller than the RTS threshold, the wireless router will not use the RTS/CTS mechanism to
send this packet.
TX Power: This determines the output power of the antenna.
Short Preamble
A radio preamble is a part of a datagram packet at the head of the Physical Layer Convergence Protocol (PLCP) to
increase throughput. Shortening the preamble reduces the size of the data packet increasing throughput. However
not all wireless network adapters are able to use this setting.
Short Slot
The amount of time the router waits after a packet collision before retransmitting the data packet. Enabling the short
slot reduces this time from 20ms to 9ms, therefore increasing overall throughput.
Tx Burst
The Transmission Burst boosts the WLAN data packet throughput to maximise transmission rates according to the
wireless protocol being used. However this may increase the rate of dropped packets due to environmental factors
such as radio interference which can make the optimal wireless data packet transmission rate less than the
maximum possible transmission rate.
Pkt_Aggregate
Packet Aggregation in IP networking is a function that concatenates multiple data packets into a single Transmission
Unit to reduce redundancy and network traffic overhead.
Country Code
The Country Code option controls the wireless channels that the router can broadcast on, defined by each countries
wireless regulations.
AP Isolation:
This feature allows you to isolate clients on your wireless network. To enable communication between the wireless
clients connected to your 3G39W-I, select Disabled. To terminate the communication between the wireless clients,
please choose Enabled.
MBSSID AP Isolation
The MBSSID AP Isolation function provides isolation among different SSIDs. When enabled this function prevents
wireless client terminals with different SSIDs from communicating with each other.
Broadcast Network Name (SSID):
Select ‘Disabled’ to hide the SSID of your 3G39W-I. If disabled, other people will not be able scan and detect this
product’s SSID.
WiFi Multimedia
WMM Capable: WMM (WiFi MultiMedia) if enabled, supports QoS for experiencing better audio, video and voice in applications
APSD Capable
The Automatic Power Save Delivery (APSD) is the foundation function for WMM Power Save technology and allows
wireless clients to request queued traffic any time instead of having to wait for the next wireless beacon frame. It
may have greater efficiency with lighter traffic loads such as voice. The feature is disabled by default and should only
be used by experienced administrators.
DLS Capable
The Direct Link Setting (DLS) function allows all wireless client’s data to be transmitted effectively. If DSL is enabled,
the wireless LAN router attempts to optimise the connection quality and data transmission rates of all connected
wireless clients. The feature is disabled by default and should only be used by experienced administrators.
WMM Parameters: Click on the WMM Configuration button to configure the WMM parameters
Multicast-to-Unicast Converter
Multicast-to-Unicast This function converts multicast data to unicast data and is disabled by default.
Others
HT TxStream: This option sets the stream number that wireless antenna transmits.
HT RxStream This option sets the stream number that wireless antenna receives.
HT Physical Mode
Operating Mode The options available for this field are Mixed Mode or Green Field. The default operation mode is Mixed Mode.
Channel Bandwidth
The channel bandwidth can be set to a mixed 20/40 MHz (the default value) giving an 802.11g connection speed of
up to 150 Mbps and an 802.11n connection speed of up to 300 Mbps. For legacy wireless adapters the Channel
Bandwidth can be set to 20 MHz slowing the connection speed for 802.11g and 802.11n to 54 Mbps and 74 Mbps
respectively as well as providing backward compatibility for older, slower 802.11b/g devices.
Guard Interval
The guard interval is designed to help wireless clients minimise the effects of multipath delays. When you add a
guard time the back portion of useful signal time is copied and appended to the front. The options available for this
field are Long or Auto. The default setting is Auto.
MCS
The Modulation and Coding Scheme (MCS) function sets the modulation, coding and number of spatial channels.
The default MCS value is Auto.
Reverse Direction Grant (RDG)
The Reverse Direction Grant (RDG) function reduces the transmitted data packet collision rate by using the reverse
direction protocol. The RDG improves transmission performance and scalability in a wireless environment. By default
the RDG setting is enabled.
Extension Channel
With the channel bandwidth is set to 20/40 MHz, the extension channel can be used to provide an adjacent channel
to the primary channel without overlapping. Using the extension channel the WLAN thus has dual 20MHz
bandwidths. The 802.11n protocol can be used to amalgamate two 20 MHz bandwidths together to create a
40MHz bandwidth which performs as two 20 MHz bandwidth. When data is being transmitted, it can act as 40MHz
bandwidth, and can also act as two independent 20 MHz bandwidths doubling the data throughput.
Aggregation MSDU (A-MSDU)
The MAC Service Data Unit (MSDU) Aggregation function wraps multiple ethernet frames bound for a common
destination in a single 802.11 frame. This reduces the number of required packet headers making the transmission
more efficient.
Decline BA Request
The Decline BA Request function can be set to refuse block acknowledgement requests from wireless clients.
Bydefault this function is disabled.
Table 19 - Advanced View - Advanced WiFi Settings
Click Apply to save any changes you make to the settings.