Ricoh Aficio 1515 Service Manual page 264

NCU PARAMETERS
7. Tone signals which frequency is lower than 1500Hz (e.g., 800Hz tone for AI
short protocol) refer to the setting at 6805B5h. Tones which frequency is higher
than 1500Hz refer to the setting at 6805B6h.
8. 68054A, 68054D, 68054E: The actual inter-digit pause (pulse dial mode) is the
sum of the period specified by the RAM addresses 68054A, 68054D, and
68054E.
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9 March 2004