tone category is still a candidate for detection. 10. The DSP shall indicate that a SIT tone has been detected if at least two of the three segments of possible SIT tones have been detected for at least the minimum interval in excess of the minimum power requirement. Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 29 11. The DSP shall indicate that an Unknown tone has been detected when it has been determined that a tone has been detected that falls within the specified frequencies for an Unknown tone, the minimum duration has been exceeded, and the tone does not match and other category tones. A.5.3.1 TONE DETECTOR PERFORMANCE REQUIREMENTS A.5.3.1.1 Single Tones There are four types of parameters that shall be used to control single tone detection. The variation of each parameter shall be limited by the constraints listed in Table A-5. ------------------------------ Minimum Maximum -------------------------------------------------------------- Frequency 300 Hz 3300 Hz -------------------------------------------------------------- Bandwidth 0 Hz 1800 Hz -------------------------------------------------------------- Duration 100 msec 32760 msec -------------------------------------------------------------- Minimum Power Level -45 dBm 3 dBm -------------------------------------------------------------- Table A-5: Single Tone Detection Constraints The frequency detection range shall be specified the Frequency and Bandwidth parameters. Figure A-2 shows the relationship of these parameters. Note that the bandwidth specification is symmetric about the center frequency. The Frequency and Bandwidth parameters define a "must detect" range. The detector shall not use frequency criteria to reject any tones which are within the range specified Frequency/Bandwidth parameters. Tones whose frequencies are outside but close to frequency range may be detected. Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 30 INSERT GRAPH Figure A-2: Frequency Domain Representation of tone parameters for a Single Tone If the Power Level of the detected parameter is greater than the minimum power specified by