User Manual

Bird Technologies Manual 7-9558-2.3 05/14/15 Page 23
Oscillation Detection
This feature shuts off the output signals from the
booster for both the uplink and downlink whenever
an oscillation condition is detected. Oscillation
detection occurs whenever port to port isolation
falls down to 25 dB or less. For normal operation
the port to port isolation needs to be at least 10 dB
greater than the gain of the booster. There are four
modes of operation for the Oscillation Detection
feature including Ignore, Alarm, Shutdown, and
Shutdown/Retry.
In the Ignore mode the booster will ignore oscilla-
tion events. In the Alarm mode the booster will gen-
erate a alarm notification by illuminating (turn RED)
the alarm button on the Link Tab and illuminating
(turn RED) an LED indicator on the control module.
The Shutdown mode is the same as Alarm mode
except the booster shuts off the output signals in
both the uplink and downlink direction. The shut-
down continues until the filters are re-enabled and
the alarm is reset. The Shutdown/Retry mode is
the same as the Shutdown mode except the
booster will retry operation the number of times
specified by the user. This is called the retry limit
which is entered into the associated box on the
System Page. How long the booster waits between
each retry attempt is determined by the retry inter-
val. After the retry limit is reached, if the booster is
till experiencing an oscillation condition, the
booster will enter the regular shutdown mode. The
Shutdown/ Retry mode is useful in situations where
brief transient overdrive signals are occurring.
Class B Enable
In order to operate the booster with a filter pass-
band greater than 75 KHz the booster MUST be
configured as a Class B booster and the customer
must register the booster online with the FCC.
Class B operation is enabled by checking the box
labeled “Enable Class B Operation”. When the box
is checked a warning message will be displayed as
shown in Figure 18 reminding the user to register
the booster with the FCC.
Figure 17: The System page.
Figure 18: Starting Class B operation message.