Lost power alert - is there such a thing?

MDKMDK wrote:

GordonThree wrote:

afidel wrote:

MDKMDK wrote:
Fortress Security Store dot com sells wireless GSM based home alarm systems that can easily be adapted to use in an RV. One of the features of the one I have is that the base station has battery backup, and issues AC power interruption alerts, when AC power is turned off or the unit is unplugged. It's set up to send an SMS message to my cell phone.

GSM based? I hope they offer an LTE upgrade module and all new ones are LTE, GSM is dead on AT&T and T-Mobile has only committed to GSM through 12/2020. WCMDA/UMTS is also on the way out with both AT&T and T-Mobile already shutting it down on certain frequencies.

LTE and GSM are two different parts of the system.

Most of the world's LTE service is delivered using GSM

Thanks Gordon. I should have said systems that use a SIM card versus non-GSM CDMA devices. I've always used GSM in general reference to a phone (or other device) that uses a SIM card to supply the network id and smarts. Maybe that's an outdated term of reference?

So GSM is the 2nd generation digital standard that replaced analog phones in most of the world (places not using CDMA). The GSM software stack was expanded to support 3G (UMTS) and 4G (LTE) by the 3GPP but those standards are not actually called GSM, that only refers to the original standard or the standards group. That's why LTE devices use SIM cards and you can switch back and forth between 3G and LTE networks, the software stack is a superset of GSM, but the underlying radio technology has changed. When talking about a radio or modem GSM almost always means the early 2G standard. I only brought it up because if it really is a GSM modem then it won't work in the US in about 18 months, don't want someone to sink hundreds of dollars on a monitoring system that will stop working that quickly!