User's Manual
UM-0825 20
2
Stationary state
3
AGC DL
4
AGC UL
5
Overload DL
6
Overload UL
Table 1
1. Start UP
Every time the Signal Booster is plugged to AC mains (or auxiliary DC power), will start a self diagnosis and
booting sequence that lasts around 20 seconds, during this time Signal Booster is not available for traffic,
and the reason is because an automatic antenna isolation control procedure runs in order to detect poor
isolation conditions. During this time all leds in the front panel will blink.
In case of bad isolation condition led “UL” or “DL” (depends on the path where auto-oscillation condition
was detected) will stay ON during five seconds.
2. Stationary state
Once the booting sequence is finished and under no AGC or Overload conditions only the PWR led must
keep ON.
3. AGC DL
Blinking condition indicates that AGC circuitry is active for downlink path. For further information
please read Automatic Gain Control (AGC) latter in this chapter.
4. AGC UL
Blinking condition indicates that AGC circuitry is active for uplink path. For further information
please read Automatic Gain Control (AGC) latter in this chapter.
5. Overload DL
Led permanently ON indicates that Overload protection circuitry for downlink path is active.
For further information please read Overload Protection latter in this chapter.
6. Overload UL
Led permanently ON indicates that Overload protection circuitry for uplink path is active.
For further information please read Overload Protection latter in this chapter.
Automatic Gain Control (AGC)
Automatic Gain Control circuitry is intended to keep Signal Booster’s output power at a fixed level when input
signals exceed maximum values, avoiding quality signal degradation by intermodulation generation.
When AGC is active AGC leds from UL or DL (or both) will blink, this means that signal level from donor site
(or from service area) plus Signal Booster gain produces an output power that is above the maximum
composite output power of the Signal Booster. This should not be considered an undesired working condition,