ms - -------------------------------------------------------------------------------------------------------------------- Minimum Interdigital 40 ms 40 ms Configurable from 24 Interval to 80 ms - -------------------------------------------------------------------------------------------------------------------- Minimum Cycle Time 93 ms 93 ms Configurable from 48 to 160 ms - -------------------------------------------------------------------------------------------------------------------- Accept Levels 0 to -36 dBm must 0 to -25 dBm must 0 dBm to configurable accept, -55 dBm must accept minimum (-25 to -45 reject dBm range) - -------------------------------------------------------------------------------------------------------------------- Twist (ratio of high -8 to +4 dB -8 to +4 dB Separately group power to low) configurable positive and negative twists: +/- 4, 6, 8, 10, and 12 dB - -------------------------------------------------------------------------------------------------------------------- Bellcore talkoff tape Fewer than 670 total - Fewer than 20 talkoffs talkoffs; fewer than (with default 330 talkoffs of digits 0- configuration of 2.5% 9; fewer than 170 to 3.5% frequency talkoffs of signals * deviation; 40 msec min and #. tone duration; +/- 8 dB twists; -45 dBm min accept level) - -------------------------------------------------------------------------------------------------------------------- Mitel talkoff tape - - 0 talkoffs (with default configuration) - -------------------------------------------------------------------------------------------------------------------- SNR 23 dB 15 dB 15 dB - -------------------------------------------------------------------------------------------------------------------- Impulse Noise Fewer than 14 missed Fewer than 10 errors Pass both Bellcore and or split digits in in 10,000 tones for EIA EIA/TIA-464A Bellcore Impulse Noise test #1; fewer than 500 impulse noise Tape No. 201 errors in 10,000 tones requirements for test #2 - -------------------------------------------------------------------------------------------------------------------- Software License D2 Technologies, Inc. and Maintenance Agreement August 4, 1997 CONFIDENTIAL 24 - ------------------------------------------------------------------------------------------------------------------- Echo 16 dB Signal-to-Echo 10 dB Signal-to-Echo Pass both Bellcore and ratio at 20 ms; 24 dB at ratio at 20 ms EIA/TIA-464A echo 45 ms requirements - ------------------------------------------------------------------------------------------------------------------- Dial Tone DTMF Detection in the DTMF Detection in the Pass both Bellcore and presence of dial tone presence of dial tone EIA/TIA-464A at -15 dBm per dial at -16 dBm per dial requirements for tone frequency tone