Re: Strange Phone Line Issue

["Petem" <petem001@xxxxxxxxx>]

CID is sounding like a modem

on this web page it is describe very well
http://www.ee.washington.edu/conselec/A95/projects/jjblome/info.htm

Here's a quote:

 "The data is transmitted serially between the first and second rings of the
incoming call. The data is transmitted at 1200 bits per second in FSK mode.
1200 Hz represents a logical 1 (mark) and 2200 Hz a logical 0 (space)"


as you can see the data is sent in fsk mode,witch mean frequency shit
keying,is the method used in modem to send data over sound..(its also used
in ham radio for transmitting data over the air...)

as you can see in the web page,CID is a standard and should not vary from
one provider to another,but I've seen difference in sound level on the line
from the same provider..





"ABLE_1" <royboynospam@xxxxxxxxxxxxx> a écrit dans le message de news:
SPGdnTbwj_DU_DnYnZ2dnUVZ_veinZ2d@xxxxxxxxxxxxxx
>> typical caller id sound..
>
> Is it???  First I would not have been listening if there was not a problem
> connecting remotely.  Second I have never heard nor listened for the CID
> before so I can't say that it is "typical".  I know that the CID happens
> between the first and second ring but always thought it was at a high freq
> data similar to DSL.  If it is CID then I need to test this elsewhere to
> see if it is the same.
>
> Which brings up another question.  Does CID vary between carriers??  And
> IF so and it was CID then it would explain why I may not have ever heard
> it before.
>
> At this time it is all still very strange.
>
>
>
>
>>> On the speaker of the butt set just before the 1st ring a small buzz
>>> click was heard and then after the first ring a carrier tone is heard
>>> for about 1 second and then a pause and then the next ring.  Nothing
>>> else is heard except for normal rings after that.
>>
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