User's Manual

User Manual CForce N100

5 TDMA

Currently, most of the outdoor bridge products are developed based on

802.11 protocols, however, it has the limitations of short-distance, hidden node

problems, and poor point-to-multi-point performance.

VTrans technology is developed and patented by CreatComm, utilizing a

series of advanced technologies such as TDMA, 10M/20M/40MHz bandwidth

support, intelligent rate control, Auto ACK Time-out Adjust, having the advantage

of long transmission range, high date rate and robust transmission.

TDMA technology solves the problems of hidden-node problem in the 802.11

network infra-structure. 10M/20M/40MHz bandwidth can be flexibly configured by

the uses in different working scenario to achieve the best link quality. Intelligent

rate control algorithm can be adapted to quick channel quality variations, while

stabilize the wireless throughput, thus suitable for long-distance transmission.

ACK Time-out Auto Adjust can automatically detect the distances of the

CFORCE N100 devices, and adjust the wireless parameters to achieve the best

link quality.

The TDMA setting is shown in the following figure.

Figure 5-1 TDMA

To use the TDMA, the user needs to enable TDMA mode in the AP device,

and set a priority level in the station device. When several stations are connected

to one AP, different stations demand different throughput. If the station demands

higher throughput, its priority level can be set to High, otherwise set to Low.

When the stations demand the same throughput, their priority level can be set to

the same level.