ANSI APPROVED
This standard defines the acoustic and electrical performance requirements of analog telephone alerters (sometimes referred to as ringers) connected to the Public Switched Telephone Network (PSTN).
TIA ANSI/TIA-470.220-D History
TIA ANSI/TIA-470.220-E
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TIA ANSI/TIA-470.220-D
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TIA ANSI/TIA-470.220-C
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