Abocom AP700C, User Manual

18

Fragment Threshold 

Fragmentation mechanism is used for improving the 
efficiency when high traffic flows along in the wireless 
network. If your 802.11g Wireless LAN PC Card often 
transmit large files in wireless network, you can enter new 
Fragment Threshold value to  split the packet.  The value 
can be set from 256 to 2346. The default value is 

2346

. 

RTS Threshold 

RTS Threshold is a mechanism implemented to prevent the 
“

Hidden Node

” problem. “Hidden Node” is a situation in 

which two stations are within range of the same Access 
Point, but are not within range of each other. Therefore, they 
are hidden nodes for each other. When a station starts data 
transmission with the Access Point, it might not notice that 
the other station is already using the wireless medium. When 
these two stations send data at the same time, they might 
collide when arriving simultaneously at the Access Point. 
The collision will most certainly result in a loss of messages 
for both stations. 

Thus, the RTS Threshold mechanism provides a solution to 
prevent data collisions. When you enable RTS Threshold on 
a suspect “hidden station”, this station and its Access Point 
will use a Request to Send (RTS). The station will send an 
RTS to the Access Point, informing that it is going to 
transmit the data. Upon receipt, the Access Point will 
respond with a CTS message to all station within its range to 
notify all other stations to defer transmission. It will also 
confirm the requestor station that the Access Point has 
reserved it for the time-frame of the requested transmission. 

If the “Hidden Node” problem is an issue, please specify the 
packet size. 

The RTS mechanism will be activated if the data 

size exceeds the value you set.

. The default value is 

2347

.  

Warning:

 Enabling RTS Threshold will cause redundant 

network overhead that could negatively affect the 
throughput performance instead of providing a remedy. 

This value should remain at its default setting of 

2347

.  Should you 

encounter inconsistent data flow, only minor modifications of this 
value are recommended.

Beacon Interval 

Beacon Interval is the amount of time between beacon 
transmissions. Before a station enters power save mode, the 
station needs the beacon interval to know when to wake up 
to receive the beacon (and learn whether there are buffered 
frames at the access point). 

DTIM Period 

DTIM stands for 

Delivery Traffic Indication Message

. A 

DTIM is a countdown field informing clients of the next