AnyTone AT-7100 Manuel de l'utilisateur - Page 17

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reign. The signal intensities of pilot frequency are still similar after relayed by mini

repeater,and it causes mobile phone to frequently switch among many base stations in

the coverage areas,it named "Ping-Pong" phenomena. When the difference of signal

intensity of each pilot frequency is less than 3dB,mobile phone connects to two or more

base stations at the same time,which makes system control load to excess or causes

over loading. It will increase the possiblity of communication cutting and decrease the

capacity of base station system. This kind of situation usually presents in mountainous

areas,highlands and the city zone with buildings crowded. In order to avoid the "Ping-

Pong" phenomena mainly adopt the follwing measures in project:

a. Change the installation location of donor antenna and direct donor antennas at a

base station until get a stable pilot frequency with strong field intensity.

b. Change the installation position of mini repeater; do not select the spot in coverage

boundary of a certain base station to avoid interference from the adjacent base

station.

c. Select strong directional donor antenna, such as high gain & big caliber paraboloid

antenna.

Mini Repeater with low gain

The reason why mini repeater with low gain mainly is setting gain attenuation. To have

reset will work.