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LGR User Guide and Technical Manual
Glossary
Term
Defi nition
APN
Access Point Name [APN] is a confi gurable network identifi er used by a
mobile device when connecting to a GSM carrier. The carrier examines the
APN identifi er to determine the network connection type for the AirStream
transmitter. The APN determines which IP addresses should be assigned
to the AirStream, which security methods should be used, and how or if, it
should be connected to a private network.
CDMA Modem
A CDMA [Code Division Multiple Access] Modem uses a digital radio
system that transmits streams of bits [PN codes]. CDMA permits several
radios to share the same frequencies. Unlike TDMA [Time Division Multiple
Access], a system used in 2G GSM, all radios can be active all the time,
because network capacity does not directly limit the number of active
radios. CDMA cellular communication standard is most commonly used in
North America.
GSM Modem
A GSM [Global System for Mobile Communications] Modem is a
specialized type of modem that accepts a SIM [Subscriber Identity Module]
card and operates over a subscription to a mobile operator, as a mobile
phone functions. When a GSM modem is connected to a digital device, it
uses the GSM modem to communicate over the mobile network. While
GSM modems are most frequently used to provide mobile Internet
connectivity, many of them can also be used for sending and receiving
SMS [Short Message Service (e.g. text message)] and MMS [Multimedia
Messaging Service] messages.
IMEI
The International Mobile Station Equipment Identity [IMEI] number is used
to identify 3GPP [i.e., GSM, UMTS and LTE]. The IMEI number is used by
the GSM network to identify valid devices and has no permanent relation
to the subscriber. The subscriber is identifi ed by transmission of an IMSI
number; stored on the SIM card.
LAN
Local Area Network [LAN] is a network that provides data communications
to users within a confi ned geographic area such as a building or complex of
buildings; TCP/IP is the typical transport protocol.
LED
Light Emitting Diode
A semiconductor diode that converts electricity into visible light.
LQ
Link Quality is a feature provided in COFDM receivers that analyzes signal-
to-noise ratio and other important digital signal parameters as supplied by
the COFDM demodulator circuit. The Link Quality feature calculates an
integer value from 0 (no signal) to 9 (highest possible quality).
MaxRC
Maximal Ratio Combining
A method of diversity combining that sums the IF/RF signals from the
antenna, according to their individual strengths to optimize performance.
