MeridianModular Telephones Page299 of 544
Option11C and 11C Mini TechnicalReference Guide
Figure 37
Block diagram of MPDA and Meridian Modular Telephone
Local alerting tones
Each telephone provides four alerting tones and a buzz sound. The system
controls the ringing cadence by sending tone-ON and tone-OFF messages to
the telephone. The alerting tone cadences cannot be changed from the
telephone, but can be altered for individual Meridian Modular Telephones by
software controlled adjustments.
Alerting tone characteristics
The tone frequency combinations are:
Tone Frequencies Warble Rate (Hz)
1667 Hz, 500 Hz 10.4
2667 Hz, 500 Hz 2.6