ZyXEL P-2812HNU-51c User Manual Page 135

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Chapter 5 WAN Setup
P-2812HNU-51c User’s Guide
135
3G Comparison Table
See the following table for a comparison between 2G, 2.5G, 2.75G and 3G
wireless technologies.
Table 31 2G, 2.5G, 2.75G, 3G and 3.5G Wireless Technologies
NAME TYPE
MOBILE PHONE AND DATA STANDARDS
DATA
SPEED
GSM-BASED CDMA-BASED
2G Circuit-
switched
GSM (Global System for Mobile
Communications), Personal
Handy-phone System (PHS), etc.
Interim Standard 95 (IS-95), the
first CDMA-based digital cellular
standard pioneered by Qualcomm.
The brand name for IS-95 is
cdmaOne. IS-95 is also known as
TIA-EIA-95.
Slow
Fast
2.5G Packet-
switched
GPRS (General Packet Radio
Services), High-Speed Circuit-
Switched Data (HSCSD), 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.
2.75G Packet-
switched
Enhanced Data rates for GSM
Evolution (EDGE), Enhanced
GPRS (EGPRS), etc.
3G Packet-
switched
UMTS (Universal Mobile
Telecommunications System), a
third-generation (3G) wireless
standard defined in ITU
A
specification, is sometimes
marketed as 3GSM. The UMTS
uses GSM infrastructures and W-
CDMA (Wideband Code Division
Multiple Access) as the air
interface.
CDMA2000 EV-DO (Evolution-Data
Optimized, originally 1x Evolution-
Data Only), also referred to as EV-
DO, EVDO, or just EV, is an
evolution of CDMA2000 1xRTT and
enables high-speed wireless
connectivity. It is also denoted as
IS-856 or High Data Rate (HDR).
3.5G Packet-
switched
HSDPA (High-Speed Downlink
Packet Access) is a mobile
telephony protocol, used for
UMTS-based 3G networks and
allows for higher data transfer
speeds.
A. The International Telecommunication Union (ITU) is an international organization within which governments and the private sector
coordinate global telecom networks and services.
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