C-2 Glossary Glossary of Terms
C-6 PN: 10580-00251 Rev. T MS2712E/13E User Guide
GPS : The Global Positioning System (GPS) is a space-based global navigation
satellite system (GNSS) that provides reliable location and time
information in all weather and at all times when and where an
unobstructed line of sight is available to four or more GPS satellites.
The system is maintained by the United States government and is
freely accessible by anyone with a GPS receiver. The Global Positioning
System is making it possible for people using ground receivers to
determine their geographic location within 10 meters to 100 meters.
The satellites use simple mathematical calculations to broadcast
information that is translated as longitude, latitude, and altitude by
Earth-based receivers.
Impedance : Impedance is a measure of RF component electricl resistance, measured
in ohms. In most cable and antenna systems, the standard impedance is
50 ohms.
Insertion Loss : Insertion Loss (or Cable Loss) is a measure of the total amount of signal
energy absorbed (lost) by the cable assembly. It is measured in dB. S21
(an S-Parameter) is another name for this measurement.
IP Address : An Internet Protocol address (IP address) is usually a numerical label
that is assigned to each device (computer or printer for example) that is
participating in a computer network that uses the Internet Protocol for
communication. An IP address serves two main functions: location
addressing and host (or network) interface identification. The Internet
Protocol originally defined an IP address as a 32-bit number. This was
known as Internet Protocol Version 4 (IPv4), which is still in use.
Growth of the Internet requires a new addressing system. An Internet
Protocol Version 6 (IPv6) that uses 128 bits for the address was
developed in 1995, and it is standardized as RFC 2460. IPv6 began
being deployed worldwide in the year 2000. IP adresses are binary
numbers, but they are usually stored in text files and displayed in
human-readable notations, such as decimal nnn.nnn.nnn.nnn or
172.16.255.1 (for IPv4), and hexadecimal
nnnn.nnnn.nnnn.nnnn.nnnn.nnnn.nnnn.nnnn or
2C01:AB18:0:1234:FF03:567C:8:1 (for IPv6). In IPv4, each decimal
group (nnn) represents values from 000 to 255, or binary values of 8
bits. In IPv6, each hexadecimal group (nnnn) represents values from
0000 to FFFF, or binary values of 16 bits (0000 0000 0000 0000 to 1111
1111 1111 1111).
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