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Test Descriptions

TEST_10 - TXA SAT/DSAT

Description

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

error and peak deviation of the three SAT tones. The rms detector is

used for measuring SAT deviation. The SAT deviation is then converted

to a peak reading.

Also, this test uses the 6 kHz BPF.

If the channel is a narrow voice channel, the test system transmits

DSAT sequence #3=25AD4D in hexadecimal. The peak deviation of the

DSAT returned by the phone is measured and reported. An eye-pattern

test is performed on the DSAT and the closure and phase jitter are

measured and reported.

Background

The supervisory audio tones (SAT) are the 5970, 6000, and 6030 Hz

tones used for signaling. One of the three tones is added to the wide

channel voice transmission by a cell site. The radio then detects the

tone and modulates the transmitted voice-channel carrier with a

constant (relative) phase tone which is regenerated from the received

tone to establish a closed loop between the mobile (cellular radio) and

the cell site. Transmission of the SAT is suspended during transmission

of wideband data on the reverse voice channel (RVC), but is not

suspended when the signaling tone (ST) is sent.

The digital supervisory tone (DSAT) performs the same function on the

narrow voice channel that the SAT performs on the wide voice channel.

The DSAT is a 24-bit digital sequence transmitted continuously at 200

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

Seven different sequences are defined.

Pass/Fail Limits Used

• 22. TXA NAMPS DSAT Closure

• 23. TXA NAMPS DSAT Deviation (Hz)

• 24. TXA NAMPS DSAT Phase Jitter

• 34. TXA SAT Deviation (kHz)

• 35. TXA SAT Frequency Error (Hz)

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Carrier 38TXA Guide Guía de usuario Pagina 30