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Chapter 2 65

Test Descriptions

TEST_28 - TXA DTMF Frequency Error

Description

This test measures the transmitter’s Dual-Tone Multifrequency

(DTMF) frequency error for the phone’s key pad. The low tone (LT) and

high tone (HT) DTMF frequencies for each selected key are checked to

make sure that the frequencies are within the DTMF frequency error

limits for their nominal values.

DTMF frequency error is expressed in%.

Background

There are two groups of sinusoidal high and low frequencies consisting

of 1209, 1336, and 1477 Hz (HT’s) in one group, and 609, 770, and 941

Hz (LT’s) in the other group.

A DTMF signal is generated when a key is pressed on the handset.

Each dialing key makes use of one assigned frequency from each group.

The DTMF signal is encoded and transmitted for control purposes when

dialing an origination from the phone.

Pass/Fail Limits Used

• 18. TXA DTMF Frequency Error (%)

Parameters Used

• 1. CPA Control Channel [1-799 or 991 -1023]

• 2. CPA DSAT Vector

• 3. CPA Enter Ph# [0=If Needed,1=Always,Here]

• 4. CPA MIN From? [0=RECC,1=All 0’s,2=Phone #]

• 5. CPA Prt RECC RVC Data [0=no 1=yes 2=fail]

• 6. CPA SAT Tone (Hz)

• 14. RC Compandor is Always On [0=no 1=yes]

• 22. RX RF Level for Signaling (dBm)

• 49. TXA TS Atten for Signaling [0, 20, 40] (dB)

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Carrier 38TXA Guide Guía de usuario Pagina 65