ZyXEL ZyWALL 5 User Guide - Page 204
WAN Technical Reference, 3G Comparison Table
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Chapter 9 WAN Screens Table 48 NETWORK > WAN > Dial Backup > Edit (continued) LABEL DESCRIPTION Retry Interval (sec) Type a number of seconds for the ZyWALL to wait before trying another call after a call has failed. This applies before a phone number is blacklisted. Drop Timeout (sec) Type the number of seconds for the ZyWALL to wait before dropping the DTR signal if it does not receive a positive disconnect confirmation. Call Back Delay Type a number of seconds for the ZyWALL to wait between dropping a callback (sec) request call and dialing the corresponding callback call. Apply Click Apply to save your changes back to the ZyWALL. Cancel Click Cancel to exit this screen without saving. 9.8 WAN Technical Reference 3G Comparison Table See the following table for a comparison between 2G, 2.5G, 2.75G and 3G wireless technologies. Table 49 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 first switched Communications), Personal Handy- CDMA-based digital cellular standard phone System (PHS), etc. pioneered by Qualcomm. The brand name for IS-95 is cdmaOne. IS-95 is also known as TIA-EIA-95. Slow 2.5G Packetswitched 2.75G 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 third- Optimized, originally 1x Evolution-Data generation (3G) wireless standard defined in ITUA specification, is Only), also referred to as EV-DO, EVDO, or just EV, is an evolution of sometimes marketed as 3GSM. The CDMA2000 1xRTT and enables high- UMTS uses GSM infrastructures and speed wireless connectivity. It is also W-CDMA (Wideband Code Division denoted as IS-856 or High Data Rate Multiple Access) as the air interface. (HDR). 3.5G Packet- HSDPA (High-Speed Downlink Packet switched Access) is a mobile telephony protocol, used for UMTS-based 3G networks and allows for higher data transfer speeds. Fast 204 ZyWALL 5/35/70 Series User's Guide