SNR (white noise) 20 dB - 20 dB - ------------------------------------------------------------------------------------------------------------------ Impulse Noise Fewer than 14 missed - Fewer than 14 missed or split digits in or split digits in Bellcore Impulse Noise Bellcore Impulse Noise Tape No. 201 Tape No. 201 - ------------------------------------------------------------------------------------------------------------------ Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 40 - ------------------------------------------------------------------------------------------------------------------ Disturbing Frequencies Detection in the - Detection in the presence of 2A-B and presence of 2A-B and 2B-A modulation 2B-A modulating products 28 dB below products 28 dB below each frequency each frequency component level of the component level of the signals. signals - ------------------------------------------------------------------------------------------------------------------ Table A-13: MFD R1 Detection Performance Requirements A.6.3 R2 Detection Performance Requirements Table A- 14 shows the MF R2 tone detection performance requirements taken from CCITT/1TU Q400-490. The MFD module is required to pass all CCITT/ITU requirements. Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 41 - -------------------------------------------------------------------------------------------------------- Characteristic CCITT/ITU Requirement CCITT/ITU Requirement - -------------------------------------------------------------------------------------------------------- Frequency Deviation +/-10 Hz must accept Configurable choice of three - -------------------------------------------------------------------------------------------------------- sets of must accept frequency tolerance: +/-10 Hz +/-15 Hz +/-20 Hz - -------------------------------------------------------------------------------------------------------- Tone Duration Must reject signals - ----------------------------------------------------------------------------------------------- --------- Minimum response time for R2 detect delay + generate detect delay + generate delay compelled signaling delay detect delay + decision detect delay + decision delay + delay + generate delay - -------------------------------------------------------------------------------------------- ------------ Accept Levels -5 dBm0 to -31.5 dBm0 must Minimum power is detect; configurable from -25 dBm to -38.5 dBm0 must reject -45 dBm per frequency - -------------------------------------------------------------------------------------------------------- Twist (ratio of high group power to low) adjacent frequencies; for adjacent frequencies; non-adjacent frequencies; for non-adjacent frequencies 20 ddB twist must reject 20 dB twist must reject - -------------------------------------------------------------------------------------------------------- Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 42