SUBJECT:

Not able to get a throughput of 2Mbps

QUESTION:

How can I get the throughput above 1Mb to be able to play wave
files and games? I have checked every possible way I know to check
I am keeping the signal strength above 90%, but have not been able
to get a throughput of 2Mbps.

ANSWER:

The data rate of the NDC is 2Mbps, not the throughput.
All other brands of wireless products with the 2M chip also have
no the 2Mbps throughput. This is a limitation on digital data
transmission application. In fact, Our NDC and other 2M
wireless products have the best performance amid all brands of
2M wireless LAN products.

For further details, please read the following:

NDC transmits at a data rate of 2Mbps. As with all network
products, there are idle periods during data transmission that
degrade average speed. The longer the idle time, the slower the
speed. The amount of idle time depends on many factors such as:
data transmission technique, number of computers in the network
(more computers, more network chatter, less speed), the data
transmission protocol space in the data package, the physical
distance and obstacles between the nodes etc. Users can improve
the speed using the following tips.

- Place the NDC PC and AP antennas in a higher
location
- Move the AP to a better location, e.g. midway between
the NDC PCs
- Minimize the number of obstructions between the NDC
PCs and the AP. Avoid placing the AP close to
metal objects (e.g. file cabinets, metal cubicles, metal ceiling/
floor/wall...etc.)
- Move the AP and the NDC PCs closer to each other
- If there is a device using the same radio frequency as the
NDC, e.g. a microwave oven, ensure the NDC
computer or AP are far enough away from it (10 meters
min. is advisable)
- Use the NDC utility to find the best location:
1. Start the AP
2. Allow a NDC PC to connect to the AP
3. From the Utility, run Connection Quality
4. Move the AP or the computer and its antenna to find
the location that gives the best performance

p.s.
Data Rate(e.g. 2Mbps for NDC) means the device
transmit data by the speed at 2 mega bit per second during
one small period, and then idle for a small period(idle time).
and then repeat the above cycle to transmit data.

There are a lot of gaps ( idle time) during data transmission.
The shorter the idle time, the higher the true speed
(Throughput).

The longness of idle time depend on many factors such as:
- Data tranmit techniques ( for example, CSMA will degrade
the Data Rate at about 60%)
- Numbers of nodes in a network.( When the traffic become
heavy, the throughput degrade badly.)
- The performance of the device's software( the better software,
the shorter idle time)
- The device's structured design including hardware/software/
firmware
- The Internet protocol which occupied the space of data
package
- The length/obstacle between nodes

For 2M NDC , the ideal throughput is 1,120 Kbit
per second under FTP application with un-noised
environment.