Setting the Active Channel Threshold Level and Auto Threshold Level

Setting the Active Channel Threshold Level and Auto Threshold Level
The active channel threshold level is an advanced setting that can be set to indicate which code channels are considered active. Any code channels exceeding this power level are considered active traffic channels and any code channels below this power level are considered inactive (or noise). Those channels that are considered active, that is, channels that meet or exceed the threshold level, are indicated by the presence of their OVSF Code below the bar in the display. Inactive channels do not have their OVSF Codes displayed.
A horizontal red line on the screen represents the threshold. The test set can set this level automatically, or you can manually enter a value.
In Auto mode the threshold level moves as the noise fluctuates. The threshold level is set by the test set at an optimal offset above the average noise floor. In Auto mode, you can alter the Auto Threshold Offset. The recommended and default setting is 0 dB. A negative value moves the threshold lower (closer to the noise floor) and is a more aggressive setting that increases the likelihood of interpreting an inactive channel as active. A positive value moves the threshold higher (away from the noise floor) and is a more conservative setting that increases the likelihood of interpreting an active channel as inactive.
In Manual mode the threshold level is fixed and does not move as the noise fluctuates.
To set the active channel threshold level:

Step
Notes

1
[Setup]

2
On [Threshold] select Auto or Manual.
Each time you press this softkey, the selected option changes. If you choose Manual, you must enter the threshold you want using the numeric keypad, then press [dB].

3
[Auto Thres Offset]
The default value is 0 dB. Optionally, you can enter a negative (more aggressive) or positive (more conservative) value, then press [dB].

NOTE: Knowing which inactive code channels are contributing the most noise to the overall W-CDMA or W-CDMA (with HSDPA) channel may provide clues to the source of noise, such as a bad channel card in the base station.


	Step	Notes
1	[Setup]
2	On [Threshold] select Auto or Manual.	Each time you press this softkey, the selected option changes. If you choose Manual, you must enter the threshold you want using the numeric keypad, then press [dB].
3	[Auto Thres Offset]	The default value is 0 dB. Optionally, you can enter a negative (more aggressive) or positive (more conservative) value, then press [dB].