DCN Wireless Installation and User Instructions System Design and Planning
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1 | Wireless network design | 1.3 Frequency band |
1.1Introduction
The DCN Wireless has three parts: the wireless network, the DCN and the optical network. This chapter tells how to design the wireless network.
1.2Limits
Limit 1: Control capacity
The maximum number of devices in the wireless network that the central control unit can control is 150.
Limit 2: Coverage area
For a good operation of the wireless part, all wireless discussion units need to be in range of the wireless access point. The wireless access point has a typical maximum coverage area of 30 m by 30 m. To determine the exact coverage area the coverage test kit can be used.
Note
You can change the power value of the wireless access point (refer to section 11.6.4).
Limit 3: Frequency
The wireless network must operate in a different frequency band than adjacent wireless computer networks (refer to section 1.3).
1.3.1802.11g specification
The wireless network is based on the 802.11g specification for WiFi technology. Devices that comply to the 802.11g specification operate in frequency bands between 2.4000 and 2.4835 GHz.
Note
Although the system operates on frequencies which are license free world wide, you must be aware of country specific limitations and follow them.
1.3.2Wireless computer networks
Wireless computer networks are also based on the 802.11g specification for WiFi technology. In the wireless computer networks, 13 overlapping channels are available (refer to figure 1.1).
1.3.3Carriers
In the wireless network of DCN Wireless, three
1.3.4Interference
The wireless network of DCN Wireless can cause interference on wireless computer networks. You must make sure the DCN wireless carrier does not overlap the WLAN channel.
1.3.5Example
Refer to figure 1.3. In the example, the WLAN channel is 3. WLAN channel 3 overlaps DCN wireless carriers 0 and 1. Therefore, use DCN wireless carrier 2.
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