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Chapter 5 Device Network Settings
Vantage CNM User’s Guide
86
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.
After you insert a 3G card in a device, the 3G connection becomes WAN 2. Refer to the
device’s User’s Guide for the type of 3G cards that you can use in the device along with the
corresponding supported features.
" You must install a 3G card in the selected device before using this WAN 2.
" The WAN 1 and WAN 2 IP addresses of the device with multiple WAN
interfaces must be on different subnets.
Table 24 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.