ZyXEL Communications 5 Series User Manual
Chapter 9 WAN Screens
ZyWALL 5/35/70 Series User’s Guide
204
9.8 WAN Technical Reference
3G Comparison Table
See the following table for a comparison between 2G, 2.5G, 2.75G and 3G wireless
technologies.
technologies.
Retry Interval
(sec)
(sec)
Type a number of seconds for the ZyWALL to wait before trying another call after a
call has failed. This applies before a phone number is blacklisted.
call has failed. This applies before a phone number is blacklisted.
Drop Timeout
(sec)
(sec)
Type the number of seconds for the ZyWALL to wait before dropping the DTR
signal if it does not receive a positive disconnect confirmation.
signal if it does not receive a positive disconnect confirmation.
Call Back Delay
(sec)
(sec)
Type a number of seconds for the ZyWALL to wait between dropping a callback
request call and dialing the corresponding callback call.
request call and dialing the corresponding callback call.
Apply
Click Apply to save your changes back to the ZyWALL.
Cancel
Click Cancel to exit this screen without saving.
Table 48 NETWORK > WAN > Dial Backup > Edit (continued)
LABEL
DESCRIPTION
Table 49 2G, 2.5G, 2.75G, 3G and 3.5G Wireless Technologies
NAME
TYPE
MOBILE PHONE AND DATA STANDARDS
DATA
SPEED
SPEED
GSM-BASED
CDMA-BASED
2G Circuit-
switched
GSM (Global System for Mobile
Communications), Personal Handy-
phone System (PHS), etc.
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.
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
switched
GPRS (General Packet Radio
Services), High-Speed Circuit-
Switched Data (HSCSD), etc.
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.
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
switched
Enhanced Data rates for GSM
Evolution (EDGE), Enhanced GPRS
(EGPRS), etc.
Evolution (EDGE), Enhanced GPRS
(EGPRS), etc.
3G Packet-
switched
UMTS (Universal Mobile
Telecommunications System), a third-
generation (3G) wireless standard
defined in ITU
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.
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).
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
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.
Access) is a mobile telephony
protocol, used for UMTS-based 3G
networks and allows for higher data
transfer speeds.