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Chapter 2 27

Test Descriptions

TEST_08 - TXA Signaling Tone/DST

Description

If the channel is a wide voice channel, this test measures the signaling

tone’s frequency and peak deviation. Since the SAT tone is always on

during this test, deviation is measured with the rms detector, with and

without the signaling tone on. The peak deviation of the signaling tone

is calculated from the two readings. Therefore, test results indicate

peak deviation, not peak+ or peak

−.

If the channel is a narrow voice channel, the peak deviation of the

digital signaling tone (DST) is measured and the DST sequence is

decoded and reported in hexadecimal.

Since this test is run in the “maintenance mode” where the base station

is waiting for an answer, the operator must press the send key on the

handset to exit the test.

Background

The signaling tone (ST) is a 10-kHz tone generated by the phone on a

wide voice channel and is transmitted to the cell site for confirming

orders (Alert, Audit, Change Power, etc.), and for signaling flash and

release requests.

The digital signaling tone (DST) performs the same function on the

narrow voice channel that ST performs on the wide voice channel. The

DST is a 24-bit digital sequence transmitted continuously at 200 NRZ

bits/second and produces an average peak deviation of 700 Hz. Each

DST sequence is the logical inverse of a corresponding digital

supervisory audio tone (DSAT) sequence.

Pass/Fail Limits Used

• 23. TXA NAMPS DSAT Deviation (Hz)

• 36. TXA Signaling Tone Deviation (kHz)

• 37. TXA Signaling Tone Frequency (kHz)

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Carrier 38TXA Guide Guía de usuario Pagina 27