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BT Changing telephone line to digital
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 Posted: Tuesday Jan 18th, 2022 09:30 am
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raygregg114
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Hi,Currently my comfort alarm has a direct connection to my home telephone line.We have just been informed that BT in the UK is changing this line to digital.How will this affect my alarm or is there something i can add to the alarm to make it digital computableThanks for your help..



 Posted: Tuesday Jan 18th, 2022 12:05 pm
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slychiu
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When they change  the line to Digital, BT should provide an analog port which can connect to analog phones, Otherwise all the phones will not work. 

You can connect Comfort TEL in to the analog port and connect the house phones to TEL OUT.  Comfort should still be able to dial out.

However with these digital lines, the DTMF detection may not work as well as before, because these digiatal lines introduce more delays, as they are meant for voice only..Similarly dialing to Central Monitoring stations (alarm Receiving stations) may not work for the same reason. 

If there is a problem then I suggest getting a UCM/GSM module which will work on the mobile 3G network. Then you will not need the phone line



 Posted: Wednesday Jan 19th, 2022 12:47 pm
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Ian
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I may have problems, the 3G signal is very poor where I am :-(



 Posted: Thursday Jan 20th, 2022 01:35 am
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slychiu
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What about 4G? There is a UCM/4G but it is more expensive



 Posted: Thursday Jan 20th, 2022 12:34 pm
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Ian
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Very poor mobile signal for 2, 3, 4 and 5 G. I live in a valley.



 Posted: Sunday Jan 23rd, 2022 06:35 am
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slychiu
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ill have to try the digital line once they switch over then



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