List of abbrevations


AD Analog/Digital
ADC Analog-to-Digital Converter
AFC Automatic Frequency Control
AGC Automatic Gain Control
Altitude The distance between the current position and the nearest point on WGS-84 (World Geodectic System 1984) reference ellipsoid. Altitude is usually expressed in meter an is positive outside the ellipsoid.
AMP Advanced Power Management
ANSI American National Standards Institute
APM Advanced Power management
APN Access Point Name
ARFCN Absolute Radio Frequency Channel Number
ARM Advanced RISC Machines
ARP Antenna Reference Point
ASC0/ASC1 Asynchronous Controller. Abbreviations used for first and second serial interface of XF55-AVL
ASIC Application Specific Integrated Circuit
ATP Adaptive TricklePower™
B Thermistor Constant
B2B Board-to-board connector
BER Bit Error Rate
BGA Ball Grid Array
Bluetooth Bluetooth (wireles connections technology) is a specification for a radio system that allows electronic devices to communicate with each other over short distances without connecting cables.
bps Bits per second
BS Basic service equivalent to parameter
BTS Base Transceiver Station
C Character of TE character set (e.g. asterics, hash or digit in case of USSD, or digits in case of held calls or multiparty calls)
CB or CBM Cell Broadcast Message
CC Constant current
CCITT Comité Consultatif International Télégraphique et Téléphonique
CE Conformité Européene (European Conformity)
CHAP Challenge Handshake Authentication Protocol
CID Context Identity
CLK Clock
CPU Central Processing Unit
CRLF Carriage Return/Line Feed
CS Coding Scheme
CSD Circuit Switched Data
CTS Clear to Send
CV Constant voltage
DAC Digital-to-Analog Converter
DAI Digital Audio Interface
dB Decibel
dBW Decibel per Watt
dBm0 Digital level, 3.14 dBm0 corresponds to full scale, see ITU G.711, A-law
DCD Data Carrier Detect
DCE Data Communication Equipment (typically modems, e.g. XF55-AVL GSM engine)
DCS 1800 Digital Cellular System, also referred to as PCN
DGPS Differential GPS
DHCP Dynamic Host Configuration Protocol
DIN German Industry Standard
DN Dialing Number
DNS Domain Name Server
DOP Dilution of Precision
DRX Discontinuous Reception
DSB Developer Support Box
DSP Digital Signal Processor
DSR Data Set Ready
DTE Data Terminal Equipment (typically computer, terminal, printer or, for example, GSM application)
DTR Data Terminal Ready
DTX Discontinuous Transmission
ECEF Earth-Centred Earth-Fixed Co-ordinate system
EEPROM Memory for parameter
EFR Enhanced Full Rate
E-GSM Extended - GSM
EGSM Enhanced GSM
EMC Electromagnetic Compatibility
EN Enable
ESD Electrostatic Discharge
ETS European Telecommunication Standard
ETSI European Telecommunication Standard Institute
FAA Federal Aviation Administration
FCC Federal Communications Commission (U.S.)
FD SIM fix dialing phonebook
FDMA Frequency Division Multiple Access
FIFO First In First Out,system in which the first item stored is the first item retrieved
FLASH memory A particular type of memory that is permanent and the data written on it will be not lost when the device is turned off. It can be updated and upgreated by special program.
FM Frequency Modulation
FR Full Rate
FTP File Transfer Protocol
GGA GPS Fixed Data
GGSN Gateway GPRS Support Node
GLL Geographic Position - Latitude/Longitude
GMM/SM GPRS Mobility Management/Session Management
GMSK Gaussian Minimum Shift Keying
GND Ground
GNSS Global Navigation Satellite System
GPI General Purpose Input
GPIO General Purpose Input Output
GPRS General Packet Radio Service
GPS Global Positioning System
GPS Time The number of seconds since Saturday/Sunday Midnight UTC, with time zero beginning this midnight. Used with GPS Week Number to determine a specific point in GPS Time.
GSA GNSS DOP and Active Satellites
GSM Global Standard for Mobile Communications
GSV GNSS Satellites in View
HDOP Horizontal DOP
HiZ High Impedance
HL High-Low
HR Half Rate
HSCSD General Packet Radio Service
HTTP Hypertext Transfer Protocol
HTTPS Secure Hypertext Transfer Protocol
Hub A device which connects to the USB port on PC or Notebook and provides several USB ports for connection to USB devices
HW Hardware
Hz Hertz (a unit of frequency)
I/O Input/Output
IC Integrated Circuit
IF Intermediate Frequency
IMAP4 Interactive Mail Access Protocol Version 4
IMEI International Mobile Equipment Identity
IP Internet Protocol. Providers offer two types of IP addresses -static IP address and dynamic IP address.
IRC Internet Relay Chat
ISO International Standards Organization
ITU International Telecommunications Union
kbps kbits per second
Latitude Halfway between the poles lies equator. Latitude is the angular measurement of a place expressed in degrees north or south of the equator. Latitude runs from 0° at the equator to 90° north or 90° south at the poles. When not prefixed with letters E or W, it is assumed positive north of Equator and negative south of Equator. Lines of latitude run in an east-west direction. They are called parallels.
LD SIM last dialing phonebook (list of numbers most recently dialed)
LDAP Lightweight Directory Access Protocol
LED Light Emitting Diode
LH Low-High
Li-Ion Lithium-Ion
LNA Low Noise Amplifier
Longitude Lines of longitude, called meridians, run in a north-south direction from pole to pole. Longitude is the angular measurement of a place east or west of the prime meridian. This meridian is also known as the Greenwich Meridian, because it runs through the original site of the Royal Observatory, which was located at Greenwich, just outside London, England. Longitude runs from 0° at the prime Meridian to 180° east or west, halfway around the globe. When not prefixed with letters E or W, it is assumed positive east of Greenwich and negative west of Greenwich. The International Date Line follows the 180° meridian, making a few jogs to avoid cutting through land areas.
LSB Least Significant Bit (of a binary word).
Mbps Mbits per second
MC Mobile Equipment list of unanswered MT calls (missed calls)
ME Mobile Equipment phonebook
MHz Mega Hertz (a unit of frequency)
MI Module Interface
MIC Microphone
MMC Multimedia Card
MMI Man Machine Interface
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
MSB Most Significant Bit (within a binary word or a byte).
MSISDN Mobile Station International ISDN number
MSK Minimum Shift Key
MSS MSK Receiver Signal
MT Mobile Terminated
NC Not Connected
NMEA National Maritime Electronics Association
NNTP Network News Transfer Protocol
NOM Network Operation Mode
NT Not Connected
NTC Negative Temperature Coefficient
NTP Network Time Protocol
OEM Original Equipment Manufacturer
ON Own numbers (MSISDNs) stored on SIM or ME
OS Operating System
PA Power Amplifier
PAP Password Authentication Protocol
PBCCH Packet Switched Broadcast Control Channel
PC Personal Computer
PCB Printed Circuit Board
PCL Power Control Level
PCM Pulse Code Modulation
PCMCIA Personal Computer Memory Card International Association
PCN Personal Communications Network, also referred to as DCS 1800
PCS Personal Communication System, also referred to as GSM 1900
PDP Packet Data Protocol
PDU Protocol Data Unit
PIN Personal Identification Number
PING(ICMP) Internet Control Message Protokol
PLL Phase Locked Loop
PLMN Public Land Mobile Network
POP3 Post Office Protocol Version 3
PPP Point to Point Protocol
PRES Presence
PRN Pseudo-Random Noise Number. The identity of GPS satellites
PSD Packet switched Data
PSU Power Supply Unit
PTF Push-to-Fix
PTM Packet Transfer Mode
PUK Personal Unblocking Key
PW Password
QoS Quality of Service
R&TTE Radio and Telecommunication Terminal Equipment
RAM Random Access Memory
RAS Remote Access Service
RC Mobile Equipment list of received calls
RF Radio Frequency
RI Ring Indicator
RMC Recommended Minimum Specific GNSS Data
RMS Root Mean Square (value)
ROM Read-only Memory
RP Receive Protocol
RTC Real Time Clock
RTCM Radio Technical Commission for Maritime Services
RTS Request To Send
Rx Receive Direction
RxD Receive Data
RXQUAL Received Signal Quality
SA Selective Availability
SAR Specific Absorption Rate
SDI Data input
SDO Data outout
SDU Service Data Unit
SELV Safety Extra Low Voltage
SIM Subscriber Identification Module
SK serial data clock
SM SIM phonebook
SMTP Simple Mail Transport Protocol
SMS Short Message Service
SMS/PP Short Message Service/Point - to - Point
SNTP Simple Network Protocol
SRAM Static Random Access Memory, a type of memory that temporarily keeps its information that processor use to execute instructions. Should the device be switched off and no external backup battery connected, it lose the contents of SRAM forever.
SSH Secure Shell
SSTE Satellite Signal Tracking Engine
STA Status
SW Software
T Time in seconds
TA Terminal adapter (e.g. GSM engine)
TCP Transmission Control Protocol
TDMA Time Division Multiple Access
TE Terminal Equipment, also referred to as DTE
Telnet Network Terminal Protocol
TP Transmit Protocol
TTFF Time to First Fix
Tx Transmit Direction
TxD Transmit Data
UART Universal asynchronous receiver-transmitter
UI User Interface
URC Unsolicited Result Code
USB Universal Serial Bus
USSD Unstructured Supplementary Service Data
UTC Universal Time Coordinated
VSWR Voltage Standing Wave Ratio
VTG Course Over Ground and Ground Speed
WAAS Wide Area Augmentation System
WAP Wireless Application Protocol
WWW World Wide Web
ZZ Type of supplementary services: All Services, Barring Services