Cambium Networks PTP 820 Series User Manual page 796

Chapter 17: Radio Configuration (CLI)
Configuring ATPC and Override Timer (CLI)
ATPC is a closed-loop mechanism by which each carrier changes the TX power according to the indication received
across the link, in order to achieve a desired RSL on the other side of the link.
With ATPC, if the radio increases its TX power up to the configured TX power, it can lead to a period of sustained
transmission at maximum power, resulting in unacceptable interference with other systems.
In order to minimize interference, PTP 820G and PTP 820F provides an ATPC override mechanism. When ATPC
override is enabled, a timer begins when ATPC raises the TX power to its maximum. When the timer expires, the
radio enters ATPC override state. In ATPC override state, the radio transmits no higher than the pre-determined
ATPC override TX level, and an ATPC override alarm is raised. The radio remains in ATPC override state until the
ATPC override state is manually cancelled by the user (or until the unit is reset). The radio then returns to normal
ATPC operation.
In a configuration with unit redundancy or radio protection, the ATPC override state is propagated to the standby
unit or radio in the event of switchover.
Note
When canceling an ATPC override state, you should ensure that the underlying problem has been
corrected. Otherwise, ATPC may be overridden again.
To enable or disable ATPC, enter the following command in radio view:
radio[x/x]>atpc set admin <admin>
To display whether or not ATPC is enabled, enter the following command in radio view:
radio[x/x]>atpc show admin
To set the RX reference level for ATPC, enter the following command in radio view:
radio[x/x]>atpc set rx-level atpc_ref_rx_level <rx-level>
To display the RX reference level for ATPC, enter the following command in radio view:
radio[x/x]>atpc show rx-level
radio[x/x]>atpc set override timeout <timeout>
Note
The next command actually enables ATPC override. However, it is recommended to set the timer
before enabling ATPC override. Failure to do so can lead to unexpected reduction of the TX power
with corresponding loss of capacity if TX override is enabled with the timer set to a lower-than-
desired value.
To enable ATPC override, enter the following command in radio view. ATPC must be enabled before you enable
ATPC override.
radio[x/x]>atpc override set admin <override admin>
To display whether or not ATPC override is enabled, enter the following command in radio view:
phn-3965_006v002
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Configuring ATPC and Override Timer (CLI)