When all the base stations are mounted and online, the coverage and handover must be tested using an handset in site survey mode.
- Take a registered handset and place a call, or even better have a service playing back a continuous message. It is important to have an active call during the site survey for the following reasons:
- You can verify that the call remains active during the test.
- The site survey menu (see the next point) will be refreshed more frequently and will be more accurate.
- Activate the site survey menu pressing the keys [Menu]*789872* (same key combination to disable it).
The site survey menu will display an overlaying area at the top of the display showing the following information:
|RPN||The RPN (Radio Fixed Part Number) identifying the base stations the handset can "see"First on the left is the base where the handset is locked into.|
|-dBM||The signal attenuation related to the above RPN|
|FE||Frame errors for the portable part (the handset) and the fixed part. Typically this value increase with RSSI values below -75dBm|
|Codec||Is the codec used for the DECT transmission, will display g.726 for narrowband calls and g.722 for HD calls|
|Channels||1st column represents the number of free DECT channels, the 2nd is the number of disturbed channels, 3rd value is the amount of highly disturbed channels, the 4rd one is the non-available channels. Having low values on the first column means heavy DECT interferences that can lead to audio issue and range reduction.|
With the site survey mode turned on, you can walk around the area and verify the handover, call quality and the number of bases the handset can reach.
In order to guarantee a good redundancy, it is important that the handset lists at least 3 bases with good dBm values (minor than -75).