Charles Pfeil is an Engineering Director in the Systems Design Division at Mentor Graphics. My first experience with computerized printed-circuit-board (PCB) design was in 1978 when I acquired two ...
• 9.0 PSTN operator Most organizations have, and continue to use, a 9 to access an outside line. When a 9 is dialed, a secondary dial tone (stutter tone) is heard. Some legacy PBX (private branch ...
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