Chapter 11 - Meridian Digital Telephones; Functional Description; Volume Control; Line Engineering - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 266 of 544

Functional description

Volume control

Line engineering

Local alerting tones

553-3011-100 Standard 14.00
Meridian Digital Telephones
The telephone interfaces with the Digital Line Card (DLC) in the Option 11C
system.
This chapter describes the features and capabilities of Meridian 1 digital
telephones.
Speaker volume (or piezo-disc transducer volume in digital telephones not
equipped with a Handsfree unit) is controlled by one key with two toggle
positions. Operating the "Volume Up" or "Volume Down" pad of the key
increases or decreases the volume for the tone or sound which is currently
active.
Meridian Digital Telephones operate through twisted pair wiring. The
maximum permissible loop length is 3500 ft. of 24AWG standard twisted
wire with no bridge taps.
Four alerting tones and a buzz sound are provided. The alerting tone cadences
cannot be changed from the telephone, but can be altered for individual
Meridian Digital Telephones by software controlled adjustments in the
system. Refer to Administration (553-3001-311) and Maintenance (553-
3001-511) for more information. All other tones such as dial tone or overflow
tones, are provided by the system from a Tone and Digit Switch.
Alerting tone characteristics
The tone frequency combinations are as follows:
Tone
1 (667 Hz, 500 Hz)
2 (667 Hz, 500 Hz)
3 (333 Hz, 250 Hz)
4 (333 Hz, 250 Hz)
January 2002
Frequencies Warble rate (Hz)
10.4
2.6
10.4
2.6