3G WiFi Router User Guide YML-O-3G19W
22 www.netcomm.com.au
5.3 Conguration
The following screen appears when you select Conguration. This screen allows you to control the following advanced features of the
Wireless Local Area Network (WLAN) interface:
• Select the channel which you wish to operate from
• Force the transmission rate to a particular speed
• Set the fragmentation threshold
• Set the RTS threshold
• Set the wake-up interval for clients in power-save mode
• Set the beacon interval for the access point
• Set Xpress mode
• Program short or long preambles
Click Save/Apply to set the advanced wireless conguration.
OPTION DESCRIPTION
Band The new amendment allows IEEE802.11g units of all types to fallback to speeds of 11Mbps, so IEEE 802.11b and IEEE
802.11g devices can coexist in the same network.
Channel Allows selection of a specic channel (1 - 1 1) or Automode.
Auto Channel Timer
(mins)
The Auto Channel times the length it takes to scan in minutes.
54g Rate In Auto (default) mode, your Router uses the maximum data rate and lowers the data rate dependent on the signal strength.
The appropriate setting is dependent on signal strength. Other rates are discreet values between 1 to 54 Mbps.
Multicast Rate Setting for multicast packet transmission rate. (1-54Mbps)
Basic Rate Sets basic transmission rate.
Fragmentation
Threshold
A threshold (in bytes) determines whether packets will be fragmented and at what size. Packets that exceed the
fragmentation threshold of an 802.11 WLAN will be split into smaller units suitable for the network. Packets smaller than the
specied fragmentation threshold value are not fragmented. Values between 256 and 2346 can be entered but this should
remain at a default setting of 2346. Setting the Fragmentation Threshold too low may result in poor performance.
RTS Threshold Request To Send (RTS) species the packet size that exceeds the specied RTS threshold, which then triggers the RTS/CTS
mechanism. Smaller packets are sent without using RTS/CTS. The default setting of 2347 (maxlength) will disable the RTS
Threshold.
DTIM Interval Delivery Trafc Indication Message (DTIM) is also known as Beacon Rate. The entry range is a value between 1 and 65535.
A DTIM is a countdown variable that informs clients of the next window for listening to broadcast and multicast messages.
When the AP has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM
Interval value. A PC clients hear the beacons and awaken to receive the broadcast and multicast messages. The default is 1.
Beacon Interval The amount of time between beacon transmissions is in milliseconds. The default is 100 and the acceptable range is 1—
65535. The beacon transmissions identify the presence of an access point. By default, network devices passively scan all RF
channels listening for beacons coming from access points. Before a station enters power save mode, the station needs the
beacon interval to know when to wake up to receive the beacon.
Xpress™ Technology Broadcom’s Xpress™ Technology is compliant with draft specications of two planned wireless industry standards. It has
been designed to improve wireless network efciency. Default is disabled.
54g Mode Select Auto mode for greatest compatibility. Select Performance mode for the fastest performance among 54g certied
equipment. Select LRS mode if you are experiencing difculty with legacy 802.1 1b equipment. If this does not work, you
may also try 802.11b only mode.
54g Protection In Auto mode, the router will use RTS/CTS to improve 802.11g performance in mixed 802.11g / 802.11b networks. Turning
protection Off will maximize 802.11g throughput under most conditions.
Preamble Type Short preamble is intended for applications where maximum throughput is desired but it does not work with legacy
equipment. Long preamble works with the current 1 and 2 Mbit/s DSSS specication as described in IEEE Std 802.11-1999
Transmit Power Set the power output (by percentage) as desired.
