Chapter 4 Tdma - HIKVISION DS-3WF03C-D User Manual

User Manual of DS-3WF03C-D Outdoor Video Wireless Network Bridge

Chapter 4 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.
XTrans technology is developed and patented by Hikvision, utilizing a series of advanced
technologies such as TDMA, 5M/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. 5M/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 DS-3WF03C-D devices, and adjust the wireless
parameters to achieve the best link quality.
The TDMA setting is shown in the following figure.
Figure 4-1 TDMA Settings
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.
When using TDMA mode, the TDMA button need to be enabled at both AP and station
devices in the web-based configuration menu. The devices from other vendors cannot
be connected to DS-3WF03C-D in the TDMA mode.
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