User Manual

27
Wireless Network Planning
Procedure 1 (Location)
1. Select and identify enough location candidates to determine freely as
the install point regardless of some design change to some extent.
2. The most crucial parameter is the range at which APU and CSU or
other Wi-Fi Client are required to operate. The range can be
determined by a conventional formula which consider a various kinds
of environmental and radio equipments.
3. Another consideration in installing APU and CSU is the network
connection like a CATV Coaxial Cable and CAT5 Ethernet Cable.
Even though some location is the best location in terms of RF
performance, the actual installed location is restricted by a limitation
of cable reach.
Procedure 2 (Radio Link Path)
1. Choose the proper antenna type with a site survey result.
2. For best performance, mount the APU and CSU in a location where
there is LOS(Line Of Sight) to each antenna.
3. Perform the field survey to summarize every obstacle like tree and
earth bulge in consideration of OLOS(Optical LOS).
4. With the site survey result, adjust the tilt and angle of antenna so that
there is maximum clearance within the FRESNEL ZONE of the
direct path.
Note: The best means of achieving FRESNEL ZONE clearance is to
raise the height of APU or CSU mounting point as high as possible
5. In order to get the more exact information on RF radio link path,
Calculate the Link Budget for Radio Link between APU and CSU
which is referred in the end of this section.
Note: The link budget is a rough calculation of all known elements of the
link to determine whether the signal will have the proper strength to the
other end of the link.
Procedure 3 (RF Channel Selection)
1. Check all range of channels by RF measurement with Frequency
Analyzer in order to see the interference effect with APU and CSU.
Actually, RF interference is likely to arise from any other wireless
system operating within the same frequency band as ISM/UNII Band
Radio Products.
Note: The final selection of operating channel should be done with
the testing results of both APU and CSU.
Procedure 4 (Radio Performance Tuning)
Please refer to the Radio Link Test
WLAN Cable Access Point 6220 NTPM99CA Rel 1.0 Issue 1 Aug 2004