American Alarms Blog

Wireless communicators - GSM and CDMA

by Adam Jacobs 10/19/2021

Wireless communicators have been popular in the security market for many years.  In the last few years, with code changes and wider acceptance by AHJs, they have become much more popular with fire alarm customers also.  With more and more of these alarm communicators in the marketplace, it's important to understand what they do and what they don't.  The two formats for digital wireless communicators on the market are GSM and CDMA.

GSM = Global System for Mobile (communications)

CDMA = Code Division Multiple Access

Globally, GSM is the more widely-used standard with about 75% of the market share.  In the US, however, CDMA is the more dominant standard.  Some of the major carriers that use these standards:

GSM - Sprint, AT&T

CDMA - Verizon, US Cellular

We have tested and installed a number of both types of communicators.  We've found that CDMA communicators are the strongest signal with least number of communication failures.  Both technologies are getting better all the time, because of competition in the market and advancements in R&D.  

Some of the attraction for customers are the cost savings and flexibility of installation.  Instead of having two phone line charges and one alarm monitoring fee every month, the customer has just one alarm monitoring fee.  All network charges are handled through the monitoring company.

***NOTE: Not all jursidictions have approved the use of "sole path" wireless communicators.  Some areas may still require some form of backup path - POTS line, internet, or radio communicator.

These communicators are here to stay, and they're a good option for many customers.  Call us to find out more about the wireless options for alarm monitoring.


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