Nortel M2018, Reference Manual

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10 General description
555-4001-110 Standard 09.03 July, 2002
system provides all other telephone tones, such as dial tone or overflow
and reorder tones.
The alerting tone cadences cannot be changed from the telephone, but
can be altered for individual M2000 digital telephones by datafill. One
application can be a separate ringing tone for each of a number of
M2000 digital telephones in the same office area to facilitate
identification.
The following table lists tone frequency combinations.
Volume control
One key with two positions controls the volume of incoming speech, the
handsfree unit, and the local alerting tone. Operating the Volume Up or
Volume Down section of the key incrementally increases or decreases
the volume for the tone or sound currently being received. To change
the volume of the ringing sound, the user must press Volume Up or
Volume Down during the interval when a burst of ringing is received.
The telephone set retains the volume settings for subsequent calls until
new volume adjustments are made.
Note: When an M2000 digital telephone is disconnected,
maintenance is performed on the loop, or a restart occurs, both the
speaker volume and alerting tone levels return to default values
(midpoint levels) after the telephone is reconnected.
Peripheral equipment
Digital line module
The telephone interfaces with the EDPC in the Digital Line Module
(DLM) of the Meridian SL-100 system using Time Compression
Table 6 Meridian digital telephones
Tone Frequencies Warble rate
1 640 Hz, 500 Hz 10 Hz
2 640 Hz, 500 Hz 2.5 Hz
3 320 Hz, 250 Hz 10.0 Hz
4 320 Hz, 250 Hz 2.5 Hz
Note: A 500-Hz buzz signal is provided for incoming call notification
while the receiver is off-hook.