H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/02 (2006.01) H04M 3/12 (2006.01) H04M 19/02 (2006.01) H04M 3/36 (2006.01)
Patent
CA 2067884
A subscriber apparatus having working ringer generators and a standby ringer generator which is alternately used when there is a fault, wherein provision is made of a traffic monitoring unit which continuously monitors the traffic of calls terminating at the subscriber lines and a ringer switching unit which switches a working ringer generator to a standby ringer generator when it is judged that the number of the terminating calls exceeds an allowable number, whereby the apparent capacity of the working ringer generators is increased.
Fujitsu Limited
Mcfadden Fincham
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