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6 KTS 340 Symbols used
2.7WLAN (Wireless Local Area Network)
2.7.1Important information on WLAN
WLAN stands for Wireless Local Area Network. As with Bluetooth, WLAN provides a radio link on the free
2.4GHz ISM band (ISM: Industrial, Scientific, Medical). This frequency range is subject to government regula- tions, but may be used without a license in most coun- tries. Consequently a large number of applications and devices employ this frequency band for transmission. This can result in frequency interference.
Depending on ambient conditions, the WLAN link may therefore deteriorate, e.g. in the case of Bluetooth links, cordless telephones,
iiBluetooth can lead to interference in the bandwidth
of the WLAN network. The antennas of Bluetooth and WLAN devices should be at least 30 centimeters apart. Do not plug Bluetooth USB adapters and WLAN sticks into adjacent USB slots on PCs/laptops. Use the USB extension cable (special accessory) to main- tain a distance between the Bluetooth USB adapter and the WLAN stick on the PC/laptop.
iiExercise extreme caution if wearing pacemakers or other vital electronic devices when using radio systems, as proper functioning of these items could be impaired.
Note the following to ensure the best possible connec- tivity:
RR The WLAN radio signal always tries to find the most direct path. When setting up the PC/laptop and ac- cess point (see section 2.6.2), make sure there are as few obstacles as possible (e.g. steel doors and concrete walls), which could interfere with the radio signal from and to the KTS 340. Inside buildings, the range of the WLAN is also greatly influenced by the construction materials used. Conventional masonry, wooden walls and certain types of dry construc- tion wall scarcely impede radio waves. Thin gypsum walls can however cause problems, as considerable amounts of moisture may accumulate in the gypsum and result in the absorption of radio signals. Concrete (and in particular reinforced concrete) largely blocks out radio waves. Cellar ceilings are often impenetra- ble. Generally speaking, walls with a lot of installed metal (e.g. pipes, wires) obstruct radio waves.
RR Radio reception is also impeded by large metal objects such as radiators and window frames as well as active sources of interference such as DECT telephones and microwave ovens.
RR Have your network infrastructure installed and
tested in advance by a data systems expert.
RR Keep the SSID and the codes for the radio link in a safe place. Make sure these data are readily to hand in case faults occur.
RR We recommend a thorough inspection of the pre- mises on commissioning: Establish where in the building the KTS 340 works properly and where the operating limits are.
RR If the KTS 340 is to be used in a vehicle (Faraday cage), radio communication can be severely limited.
RR The radio link is affected by weather conditions. The reception signal may therefore vary.
RR Please contact your network administrator with any queries.
2.7.2Information on access points
A wireless access point is an electronic device, which acts as an interface between a radio network and a
iiWe recommend using WLAN standard IEEE 802.11g (data transmission rate max. 54 Mbps) for the access point. The "extended range" function is not supported.
Please note the following:
RR The access point should be located as centrally and high up as possible, ideally under the ceiling.
RR The access point antenna should face downwards towards the floor.
RR In the event of a poor connection it may be useful to change the set channel on the access point. If pos- sible, avoid using neighboring channels to channels that are already in use.
RR We recommend that encryption of radio communica- tions is configured at the access point.
2.7.3Information on WLAN for USA and Canada
USA:
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Canada:
Operation is subject to the following two conditions: RR this device may not cause interference, and
RR this device must accept any interference, including interference that may cause undesired operation of the device.
This Class [B] digital apparatus complies with Canadian
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