Local Alerting Tones - Meridian Nortel 1 Option 11C Technical Reference Manual

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
1
2
Meridian Modular Telephones
Frequencies
667 Hz, 500 Hz
667 Hz, 500 Hz
Option 11C and 11C Mini
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Warble Rate (Hz)
10.4
2.6
Technical Reference Guide