1200 and 2200 hz I think (bell 202 FSK). You can certainly hear it. It is the same as the data burst during the emergency broadcast system. EAS system. Very annoying.
Ring frequency is normally 20 Hz 90 VAC. You can hear it but it is more of sensation to your ear that you feel than hear. You can certainly feel it if you put your fingers across the line. From: Adam Moffett Sent: Thursday, November 9, 2017 2:46 PM To: af@afmug.com Subject: Re: [AFMUG] ATA CallerID question Is it at an inaudible frequency? If so, then it wouldn't make it through 2600hz bandpass filters would it? Or maybe it's audible, but so short you don't notice it? I'm fuzzy on this. I probably shouldn't ask. I don't need to know that much about POTS anymore. ------ Original Message ------ From: "Lewis Bergman" <lewis.berg...@gmail.com> To: af@afmug.com Sent: 11/9/2017 4:40:57 PM Subject: Re: [AFMUG] ATA CallerID question More info than anyone probably wants to know. I found this about the original question: Caller-ID Signaling According to Telcordia specifications, CND signaling starts as early as 300 mS after the first ring burst and ends at least 475 mS before the second ring burst From here: http://www.tech-faq.com/caller-id.html On Tue, Nov 7, 2017 at 9:29 PM Adam Moffett <dmmoff...@gmail.com> wrote: I did not know that tone contained modulated data. I just thought it was a noise you wouldn't ignore. That's a fun fact to have. ------ Original Message ------ From: ch...@wbmfg.com To: af@afmug.com Sent: 11/7/2017 4:39:27 PM Subject: Re: [AFMUG] ATA CallerID question >Monitor the line for the data burst. It is the exact same modulation >method as the emergency alert system you hear squawking on the TV >before the beep and thunderstorm warning. > >I think it comes before the first ring or right after the first ring. >Some of the original display units rectified and stored ring voltage >for power so it may need the ring first to power the display box then >the data. > >In any event, you can hear it if you have a butt sett with line monitor >mode. >Bell 202 is correct. > >-----Original Message----- From: Nate Burke >Sent: Tuesday, November 7, 2017 1:58 PM >To: Animal Farm >Subject: [AFMUG] ATA CallerID question > >At a customer, I just hooked up a Cisco SPA122 into an Ancient Lucent >PBX system. The customer says that caller ID is not coming through, >but >it used to work with his old AT&T Lines, and it appears to be hitting >the ATA Properly. Is there a setting on the ATA that needs to be set >that older systems may be looking for? > >The only settings I see for Caller ID in the ATA are Caller ID Method, >currently set to 'Bellcore(N.Amer,China)' and Caller ID FSK Standard, >set to 'Bell 202' I've never had to mess with those settings before. > >Nate
