ZyXEL Communications ISG50-ISDN User Manual page 252

Chapter 12 Interfaces
• You can set the 3G device to connect only to the home network, which is the network to which
you are originally subscribed.
• You can set the 3G device to connect to other networks if the signal strength of the home
network is too low or it is unavailable.
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.
Table 69 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 Services), High-
switched Speed Circuit-Switched Data (HSCSD), etc.
2.75G Packet- Enhanced Data rates for GSM Evolution
switched (EDGE), Enhanced GPRS (EGPRS), etc.
3G Packet- UMTS (Universal Mobile Telecommunications
switched System), a third-generation (3G) wireless
standard defined in ITU
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 Packet
switched 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.
To change your 3G WAN settings, click Configuration > Network > Interface > Cellular.
Note: Install (or connect) a compatible 3G USB to use a cellular connection.
Note: The WAN IP addresses of a ISG50 with multiple WAN interfaces must be on
different subnets.
252
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
A
specification, is 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).
DATA
SPEED
Slow
Fast
ISG50 User's Guide