ZyXEL Vantage CNM User Guide - Page 88
Table 24
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Chapter 5 Device Network Settings If the signal strength of a 3G network is too low, the 3G card may switch to an available 2.5G or 2.75G network. See the following table for a comparison between 2G, 2.5G, 2.75G, 3G and 3.5G wireless technologies. Table 24 2G, 2.5G, 2.75G, 3G and 3.5G Wireless Technologies NAME TYPE MOBILE PHONE AND DATA STANDARDS GSM-BASED CDMA-BASED DATA SPEED 2G Circuit- GSM (Global System for Mobile Interim Standard 95 (IS-95), the Slow switched Communications), Personal first CDMA-based digital cellular Handy-phone System (PHS), etc. standard pioneered by Qualcomm. The brand name for IS-95 is cdmaOne. IS-95 is also known as TIA-EIA-95. 2.5G 2.75G Packetswitched Packetswitched GPRS (General Packet Radio Services), High-Speed CircuitSwitched Data (HSCSD), etc. Enhanced Data rates for GSM Evolution (EDGE), Enhanced GPRS (EGPRS), etc. CDMA2000 is a hybrid 2.5G / 3G protocol of mobile telecommunications standards that use CDMA, a multiple access scheme for digital radio. CDMA2000 1xRTT (1 times Radio Transmission Technology) is the core CDMA2000 wireless air interface standard. It is also known as 1x, 1xRTT, or IS-2000 and considered to be a 2.5G or 2.75G technology. 3G Packet- UMTS (Universal Mobile CDMA2000 EV-DO (Evolution-Data switched Telecommunications System), a Optimized, originally 1x Evolution- third-generation (3G) wireless standard defined in ITUA Data Only), also referred to as EVDO, EVDO, or just EV, is an specification, is sometimes evolution of CDMA2000 1xRTT and marketed as 3GSM. The UMTS enables high-speed wireless uses GSM infrastructures and W- connectivity. It is also denoted as CDMA (Wideband Code Division IS-856 or High Data Rate (HDR). Multiple Access) as the air interface. 3.5G Packetswitched HSDPA (High-Speed Downlink Packet Access) is a mobile telephony protocol, used for UMTS-based 3G networks and allows for higher data transfer speeds. Fast A. The International Telecommunication Union (ITU) is an international organization within which governments and the private sector coordinate global telecom networks and services. 88 Vantage CNM User's Guide