Sierra Wireless 580 - Manual (Page 38)

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Appendix A: Glossary
1xEV-DO -- Evolution Data Optimized An evolution of cdma2000® 1x technology and is an 3G standard.
1xEV-DO provides peak data rates of up to 2.4 Mbps. Also known as high data rate, or HDR, providing
high-speed, high-capacity wireless Internet connectivity, and is optimized for packet data services. EV-
DO only addresses data - not voice. It requires a dedicated slice of spectrum, separate from voice
networks using standards such as 1xRTT.
1xRTT -- One Times Radio Transmission Technology (the one times refers to the frequency spectrum),
a 3G standard technology that supports speeds up to 144 kbps. 2G
2G -- Second generation data transfer uses as much network capacity as any other call, and uses that
capacity for the duration of the connection, regardless of whether data is being transmitted at any one
moment. In contrast, the newer 3G standard is much faster for data, and only uses network capacity
when data is actively being transmitted
.
3G Third generation—A new generation of wireless systems, including cdma2000 1xRTT and 1xEV-DO,
that provides high speed data transmission (144 kbps and higher) and Internet Protocol (IP) based
services in fixed, portable and mobile environments.
bps bits per second—The actual data speed over the transmission medium. See also baud.
carrier -- A wireless network service provider, licensed to use radio frequencies in particular regions.
CDG -- CDMA Development Group. Consult
www.cdg.org . Also a series of three test suites required to
certify a device for use on a CDMA network.
CDMA -- Code Division Multiple Access A wideband spread spectrum technique used in digital cellular,
personal communications services, and other wireless networks. Wide channels (1.25 MHz) are obtained
through spread spectrum transmissions, thus allowing many active users to share the same channel.
Each user is assigned a unique digital code, which differentiates the individual conversations on the
same channel. CDMA2000 1X Also known as 1xRTT, this is a high-speed standard for CDMA cellular
communications.
CnS -- Control and Status A proprietary protocol for managing Sierra Wireless devices.
COM -- The serial communications port of a computer.
directory number See MIN
DNS -- Domain Name Server Internet server that supplies the mapping of domain names to IP
addresses.
Dormancy -- The packet data connection has the logical PPP session left open while the underlying
physical link (the radio channel) is released. When traffic is to resume, a radio channel is required and
the original PPP session resumes.
DSRDUN -- Dial-Up Networking. A Windows
® protocol for connecting a computer to a server via the
telephone network.
E911 -- Emergency call mode.
ERP -- Effective Radiated Power. A measure of the RF energy radiated from an antenna.