ZyXEL ZyWALL USG 2000 User Guide - Page 300
G, 2.5G, 2.75G, 3G and 3.5G Wireless Technologies
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Chapter 13 Interfaces 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 and 3G of wireless technologies. Table 63 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 Packet- GPRS (General Packet Radio switched Services), High-Speed Circuit- Switched Data (HSCSD), etc. Packet- Enhanced Data rates for GSM switched 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 evolution specification, is sometimes of CDMA2000 1xRTT and enables marketed as 3GSM. The UMTS high-speed wireless connectivity. It uses GSM infrastructures and W- is also denoted as IS-856 or High CDMA (Wideband Code Division 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. To change your 3G WAN settings, click Configuration > Network > Interface > Cellular. Note: Install (or connect) a compatible 3G card to use a cellular connection. See Chapter 57 on page 891 for details. Note: The WAN IP addresses of a ZyWALL with multiple WAN interfaces must be on different subnets. 300 ZyWALL USG 2000 User's Guide