2.8 Connection of 2.4 GHz Portable Stations148 Installation ManualCS Coverage AreaThe example below shows the size of the coverage area of 1 CS if it is installed in an area with no obstacles.NoteRadio signal strength levels are measured during the site survey (refer to "2.8.5 Site Survey").Site Survey Preparation1. Obtain a map and investigate the installation site.a. Check the obstacles (e.g., shelves, columns, and partitions).b. Check the materials of the structures (e.g., metal, concrete, and plywood).c. Check the layout and dimensions of the room, corridor, etc.d. Write down the above information on the map.2. Examine the service area required by the user on the map, referring to the following example.a. Draw the coverage area around a CS. Extend the coverage area 30 m to 60 m in each direction,depending on the materials of the building structures and obstacles in the installation site. Notethat a CS cannot be installed outside a building.b. If one CS cannot cover the entire service area, install additional CSs as required. Overlap thecoverage areas of adjacent CSs.Where CS coverage areas overlap, the PS will start call handover to the next CS if the signal fromGray Zone:Conversation will beintermittentCoverage AreaRadio signal strength level isgreater than "3".(About 50 m to 60 m)Good Coverage AreaRadio signal strengthlevel is greater than "8".(About 30 m to 40 m)Good sound qualitycan be maintained.Out of Service:Cannot make/receive callsABABRadio Signal Strength LevelsCOut of rangeReceives noise easily or disconnectsMay receive noiseGoodBetterLevel: 00Level: 01 to 02Level: 03 to 07Level: 08 to 10Level: 11 to 12
