ACCHL: Associated Control Channel, L-Band
AI: Access Identifier
BPSK: Binary Phase Shift Keying
CC: Call Control
CEPT: Conference Europeenne des Postes et Telecommunications
DE-BPSK: Differentially Encoded Binary Phase Shift Keying
DE-QPSK: Differentially Encoded Quaternary Phase Shift Keying
DFOA: Difference of Frequency of Arrival
DTOOA: Difference of Time of Arrival
DTOOA/DFOA: Difference of Time of Arrival/Difference of Frequency of Arrival
EIRP: Effective Isotropic Radiated Power
ETSI: European Telecommunications Standards Institute
FDMA: Frequency Division Multiple Access
GE: Geopolitical Entity
GMPCS: Global Mobile Personal Communications by Satellite
GPS: Global Positioning System
GSM: Global System for Mobile Communications
HLR: Home Location Register
ISU: Individual Subscriber Unit
ITU-R: International Telecommunication Union - Radio
kbps: kilo bits per second
ksps: kilo symbols per second
LAC: Location Area Code
LBP: L-Band Physical
LEA: Law Enforcement Agency
LEMF: Law Enforcement Monitoring Facility
LEO: Low Earth Orbit
LL: L-Band Link
MAP: Mobile Application Part
MM: Mobility Management
MOU: Memorandum of Understanding
MSC: Mobile Switching Center
MSC-MS: Mobile Switching Center to Mobile Subscriber
MSISDN: Mobile Station Integrated Services Digital Network
MSS: Mobile Satellite Service
MTD: Message Termination Devices
MXU: Multiplexed Unit
PSFD: Power Spectral Flux Density
PSTN: Public Switched Telephone Network
QPSK: Quadrature Phase Shift Keying