Sierra Wireless 555 User Manual
Rev 3.5 Feb.05
59
A
Appendix A: Glossary
1X
One Times Radio Transmission Technology (the "one times"
refers to the frequency spectrum)
refers to the frequency spectrum)
bps
bits per second—The actual data speed over the transmission
medium.
medium.
CAB
CABinet files. A Windows executable file format containing
system installation instructions and content for self-extraction
and installation.
system installation instructions and content for self-extraction
and installation.
CDMA
Code Division Multiple Access—A wideband spread
spectrum technique used in digital cellular, personal commu-
nications services, and other wireless networks. Wide
channels (1.25
spectrum technique used in digital cellular, personal commu-
nications services, and other wireless networks. Wide
channels (1.25
) 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.
same channel. Each user is assigned a unique digital code,
which differentiates the individual conversations on the same
channel.
CDMA 1X
Also known as
, this is a high-speed standard for
cellular communications.
circuit switched cellular
V.xx modem communications over a cellular network. It uses
a dedicated connection circuit, in contrast to
a dedicated connection circuit, in contrast to
-switched.
The user is charged by the carrier for the duration of the
connection.
connection.
DHCP
Dynamic Host Configuration Protocol—A protocol used to
automatically assign
automatically assign
es and related information.
DHCP also provides safe, reliable
network configu-
ration.
dormant
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 re-
aquired and the original PPP session resumes.
released. When traffic is to resume, a radio channel is re-
aquired and the original PPP session resumes.
E911
Enhanced 911—The capability to automatically identify, to
emergency dispatchers, the location from which a wireless call
is being made. Phase I requires carriers to provide the
telephone number of a mobile making a 911 call and the
location of the cell site or base station handling the call.
Phase II requires carriers to deliver more specific latitude and
longitude location information, known as Automatic Location
Identification (ALI). This typically involves GPS receivers at
the mobile.
emergency dispatchers, the location from which a wireless call
is being made. Phase I requires carriers to provide the
telephone number of a mobile making a 911 call and the
location of the cell site or base station handling the call.
Phase II requires carriers to deliver more specific latitude and
longitude location information, known as Automatic Location
Identification (ALI). This typically involves GPS receivers at
the mobile.
ESN
Electronic Serial Number—The unique serial number
assigned to the modem for cellular network use.
assigned to the modem for cellular network use.