ZyXEL Communications Vantage CNM 2.3 User Manual page 88

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
MOBILE PHONE AND DATA STANDARDS
NAME TYPE
GSM-BASED
2G Circuit- GSM (Global System for Mobile
switched Communications), Personal
Handy-phone System (PHS), etc.
2.5G Packet- GPRS (General Packet Radio
switched Services), High-Speed Circuit-
Switched Data (HSCSD), etc.
2.75G Packet- Enhanced Data rates for GSM
switched Evolution (EDGE), Enhanced
GPRS (EGPRS), etc.
3G Packet- UMTS (Universal Mobile
switched Telecommunications System), a
third-generation (3G) wireless
standard defined in ITU
specification, is sometimes
marketed as 3GSM. The UMTS
uses GSM infrastructures and W-
CDMA (Wideband Code Division
Multiple Access) as the air
interface.
3.5G Packet- HSDPA (High-Speed Downlink
switched 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.
88
CDMA-BASED
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.
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.
CDMA2000 EV-DO (Evolution-Data
Optimized, originally 1x Evolution-
Data Only), also referred to as EV-
A
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).
DATA
SPEED
Slow
Fast
Vantage CNM User's Guide