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Chapter 7 Interfaces
ZyWALL 110/310/1100 Series User’s Guide
133
Aside from selecting the 3G network, the 3G card may also select an available 2.5G or 2.75G
network automatically. See the following table for a comparison between 2G, 2.5G, 2.75G and 3G
of wireless technologies.
To change your 3G WAN settings, click Configuration > Network > Interface > Cellular.
Note: Install (or connect) a compatible 3G USB device to use a cellular connection.
Note: The WAN IP addresses of a ZyWALL with multiple WAN interfaces must be on
different subnets.
Table 47 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.