Overview
The test set's IS-856 Test operating mode is used when it is not possible, or not desired, to communicate via over-the-air signaling with the access terminal (AT), but forward link stimulus and reverse link measurements are still needed.
In IS-856 Test operating mode, the test set does not send any signaling information on the forward link. Any changes to the access terminal (AT) configuration, such as channel, MAC index, forward traffic data rate, etc., must be accomplished by directly sending commands to the AT from a system controller (usually a personal computer) through a proprietary digital interface.
Upon entry into IS-856 Test operating mode, the test set begins continuously transmitting a forward link signal which consists of forward channels such as pilot, MAC, and traffic channels. The PC controller is required to initiate the test mode in the AT, step the AT through the call setup process (such as acquire pilot, acquire sync, and demodulate forward traffic channel). When the AT synchronizes to the forward channels and successfully demodulates the forward link signal, the AT starts transmitting a corresponding reverse link signal. The AT's transmitter performance can then be measured using the suite of measurements shown when the
Measurement selection
key is pressed. A typical test setup is shown in the figure below.
Typical Measurement Setup in IS-856 Test Mode
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