Service Area.  A number of location areas are grouped together to form a service area.
Subscriber Identity Module.  A card or plug in module associated with a particular subscriber which identifies that subscriber.
In analog to digital conversion speech is sampled at frequent intervals.  These samples are then converted into digital form.
A cell served by an antenna which  transmits in a particular direction,  e.g., over an area of 120 degrees.
A number of location areas are grouped together to form a service area.
Form of environmental attenuation of radio signals caused by the presence of buildings, hills etc.  It is also known as log normal fading.
A service allowing short text messages to be sent to or from a mobile subscriber.  This service is similar to existing paging systems with text transmission with the additional feature that an acknowledgement is sent when the message has been received.
During analog to digital conversion, speech is coded into a digital format and redundant information contained in speech is removed before transmission.
A technical specification developed in a public forum by service providers, manufacturers, and consultants.  The goal is to create a standard that can be built and used by anyone.
Process of connecting appropriate lines and trunks to form a desired communication path between two station sets.  Included are all kinds of related functions, such as sending and receiving signals, monitoring the status of circuits, translating addresses to routing instructions, alternate routing, testing circuits for busy condition, and detecting and recording troubles.
Burst used for time synchronization for the MS.
A group of devices forming a network used for a common purpose.  A functional unit.