The Honeywell 3GL is an Alarmnet cellular communication module that is directly inserted into the L5200, L5210 or L7000 LYNX Touch. Alarmnet was established in 1986 as a way for Honeywell to oversee and secure any alarm signals from the security system to the monitoring provider. Essentially, Alarmnet is a server where all communications are received and decrypted then sent along to Total Connect and/or a central station service. This offers oversight in the form of signal history logs which can be used when troubleshooting communication issues.
The 3GL allows LYNX Touch owners to setup Total Connect and Central Station monitoring. Originally, Honeywell released the 4GL along with the L5200 and L7000 LYNX Touch panels. After some time, Honeywell rebranded the 4GL to the 3GL since the cellular communicators are limited to the AT&T 3G HSPA cellular network and the 4GL name was misleading. The 3GL's predecessor the GSMVLP5-4G does support 4G communications. However unlike your smartphone, the data transferred from the panel does not require the bandwidth of the 4G network. In fact, the 3G network speeds and bandwidth are more than ample.
The most popular use of the 3GL is in the application of dual path monitoring. The L5100-WIFI is an internet communicator that is often setup as a primary path on the LYNX Touch panels. Although the WIFI unit offers faster speeds than the 3GL, it is vulnerable to a myriad of situations (i.e. power loss to the router, cable cuts, IP conflicts) that will compromise the signals from being sent out to Alarmnet. Adding the 3GL grants alarm owners the ability to use the speed of the internet when it is available and the reliability of the cellular path in the event of an internet failure.
Cellular communications are the only alternative for those without an internet connection and looking to setup Total Connect. Unfortunately, Honeywell does not have a Verizon (CDMA) option as of right now. Analog phone lines (POTS) will support central station monitoring (not Total Connect) for the L5200 and L5210. On the other hand, the L7000 is the first of Honeywell's panels to be stripped of a phone dialer.
If you are concerned about poor or mediocre AT&T cellular service you can install a cellular amplifier. We recommend the WeBoost or ZBoost brands. This option requires some signal in order to be amplified and directed at the panel.