# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Gaussian Frequency Modulation (GFM) | 高斯频率调制（调频）
Gaussian Frequency Modulation (GFM) spreads the signal, while reducing unwanted noise and harmonics, this enables our two-way wireless technology to meet stringent European, ETSI and other worldwide standards.
General Packet Radio Service (GPRS) | 通用分组无线服务
GPRS is a packet oriented mobile data service on the 2G and 3G cellular communication system's global system for mobile communications (GSM).
Global System for Mobile Communications (GSM) | 全球移动通讯系统 (GSM)
GSM is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation digital cellular networks used by mobile devices such as mobile phones.
Grading | 等级
Alarm systems and products relating to intruder systems are graded depending on the level of security they offer. An intruder alarm is only graded as high as its lowest component which means that if a grade 3 system has one grade 2 device on it, the whole system is downgraded to grade 2.
Guard Code | 警卫代码
A Guard Code can be used to unset the control panel only after the ‘Guard Code Alarm’ time has expired. The code will set a system and an output type (Guard Code) will activate when this code is used.
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