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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: iPhone battery replacement
Date: Thu, 6 Jun 2024 05:34:58 -0700
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On 6/5/2024 8:21 PM, Bertrand Sindri wrote:
>> I question how the correct dialpulse timing is detected as a
>> rotary dial phone imposes a specific make-break ratio and pulse
>> rate.
> 
> Blame this on the lawyers.  To avoid issues of liability, if the telephone
> switch detects a pulse pattern that might plausably be interpreted as an
> attempt to "dial" 911, then the phone company forwards your info on to the
> 911 call center.

But a dial-pulse needs to be an actual make-break of the loop, not just
"line noise".  Would outpulsing at, for example, 400Hz ever be considered
a legitimate signal?  (IIRC, dial-pulse rate was ~10Hz; are there "natural
phenomena that even approach that with any sort of regularity?)

And, why would the "signal" suddenly disappear and not be a regular happening?
I.e., why only one visit in 30 years and not once a month?

> Once the 911 call center has become involved, then the police have to handle
> it as if it were a request for emergency services.