Reverse Closed Loop Power Control

Last updated: November 19, 2008

The reverse closed loop power control parameter determines what bits are sent to the access terminal for closed loop power control.

Reverse closed loop power control
Setting	Description
Active Bits ^*	The test set actively determines if the access terminal is transmitting at a power level that is too high or too low (based on the expected R-Pilot level, see Expected Power ), and responds by sending the appropriate up or down power control bit.
Alternating Bits	The test set sends alternating "0" (up) and "1" (down) power control bits to the access terminal regardless of its output power.
All Up Bits	The test set sends all "0" (up) power control bits to the access terminal regardless of its output power.
All Down Bits	The test set sends all "1" (down) power control bits to the access terminal regardless of its output power.
* In addition to the Active Bits that is only available in Active Cell Operating Mode , all other settings are available in both Active Cell Operating Mode and IS-856 Test Operating Mode .

Operating Considerations

In Active Cell Operating Mode , in order for the test set to successfully decode signalling from the AT, the signal level into the test set's RF IN/OUT connector must be within 9 dB of the expected input power (see Expected Power ). When Reverse Closed Loop Power Control is set to All Up Bits or All Down Bits, the AT's power will not be within the required range, and all signalling will fail. Before attempting any signalling between the test set and AT, you must either set Reverse Closed Loop Power to Active Bits, or manually range the Receiver Power to the level that the AT is currently transmitting based on the Reverse Closed Loop Power Control setting (see Manual receiver power ).
In IS-856 Test Operating Mode , if the access terminal is responding to power control bits, and with alternating bits selected in the Rvs Power Ctrl field, cell power level changes will control the access terminal's power level according to open loop power control behavior.