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The process of validating and identifying a caller as being a legitimate Globalstar user.

Automatic mode selection
Based on this user-changeable setting, the phone automatically determines whether it should make a call in Globalstar or cellular modes, depending on availability.

The probability of attaining a specified level of performance and maintaining that level for a scheduled period of time.

A related set of frequencies which use a contiguous portion of the spectrum, often for a similar application.

The range of frequencies, measured in hertz (Hz), that can pass over a given transmission channel. The bandwidth determines the rate at which information can be transmitted through the circuit.

A portion of the satellite footprint at L-band and S-band. The satellite footprint is divided into 16 beams.

A signal relay scheme in which a terrestrial-based signal is sent to a satellite, which then relays the signal back to earth with minimal processing by the satellite.

Call barring*
This service can be used in several ways: for the barring of all incoming calls or incoming calls when roaming; similarly, all outgoing calls may be barred, all outgoing international calls, or all outgoing international except those directed back to the user's home country.

Call forwarding*
Enables the caller to have incoming calls forwarded to a different telephone number (i.e. voicemail) under pre-determined conditions such as if the handset is busy, if calls are not answered within a certain period of time, or if the handset is unable to receive transmission for whatever reason. An unconditional call forwarding option is also available.

Call hold*
This service allows the user to put a caller on hold to either answer another call or dial a second number. The user can alternate between, or terminate, either of the two calls.

Call transfer*
Enables the subscriber to transfer a call to a third party. The call to be transferred may be an incoming or outgoing call.

Calling line ID*
This service allows the subscriber to preview the incoming caller's phone number, if provided by the network, and if allowed by the caller.

Call waiting*
Call waiting alerts the user of an incoming call when the user is already on the line. To receive the incoming call, the first call can either be terminated or put on hold.

A band of frequencies in the 4 to 8 GHz frequency transmission range that are used for satellite and terrestrial communications.

CDMA (Code Division Multiple Access)
Code Division Multiple Access. A digital technology pioneered by QUALCOMM that provides crystal clear voice quality in an exciting new generation of wireless communications products and services. Using digital encoding and "spread spectrum" radio frequency (RF) techniques, CDMA provides much better and cost-effective voice quality, privacy, system capacity, and flexibility than other wireless technologies, along with enhanced services such as short messaging, e-mail and Internet access.

CDMA (forward) circuit
A 1.23 MHz wide spread-spectrum signal (with a unique Walsh code) that resides within an FDM channel. It typically provides connection between the handset and the Gateway via the satellite.

A 1.23 MHz wide frequency band that contains multiple CDMA circuits.

Closed user group*
This service enables users to be part of a group in which the members (i.e. employees of the same company) can place calls to each other but not to members outside of the group. Users may be a member of multiple groups. It is applicable to all services except emergency calling.

Connected line ID*
This feature allows the calling party to have the called party's telephone number displayed on the handset. This service may also be restricted.

Coverage area
A geographical area, which moves in time with the satellite, which defines the antenna coverage of a particular satellite.

Referring to communications techniques and procedures whereby information is encoded as binary language, as opposed analog representation of information in variable, but continuous, wave forms.

The portion of a satellite circuit extending from the satellite to the user terminal. The Globalstar system establishes the service downlink in the S-band region of the frequency spectrum.

Dual mode
A handset which has the ability to operate on several frequencies and several types of communications systems. For example, the Globalstar system will have the capability of operating in either a cellular or satellite mode.

Feeder link sub band
A frequency band 16.5 MHz wide that contains up to 13 FDM channels which corresponds to a single user-link antenna beam, and is a part of the feederlink band which is transmitted either to or from the satellite by a gateway antenna.

Feederlink band
A band of frequencies approximately 160 MHz wide containing contiguous feeder link sub bands. There are 16 sub bands on the uplink band and 16 on the downlink band. They are communicated as eight contiguous sub bands on RHCP and eight on LHCP polarization, to or from the Gateway.

Frequency Division Multiple Access (FDMA)-communicating devices at different locations sharing a multi-point or broadcast channel by means of a technique that allocates different frequencies to different users.

FDM channel
A 1.23 MHz wide channel with a specific center frequency.

The portion of the earth's surface covered by the signal from a communications satellite.

Gateway link
The link between the Gateway and the satellite.

Geosynchronous orbit
The orbit directly above the equator, about 35,800 kilometers (22,300 miles) above the earth in space. Also known as GEO, geostationary and Clarke orbit. When positioned in this orbit, a satellite appears to hover over the same spot on the earth because it is moving at a rate that matches the speed of the earth's rotation on its axis.

Global roaming
The ability of a Globalstar subscriber to travel worldwide, and subject to certain limitations, make and receive Globalstar telephone calls -- particularly outside the service area of the subscriber's telecommunications service provider.

Hand off
The process of transferring a subscriber call from one satellite to another.

Inclination angle
The angle at which a satellite orbit is tilted relative to the earth's equator. Globalstar satellites are at a 52 degree inclination.

A band of frequencies in the 18 to 31 GHz range that are available for global satellite use.

A band of frequencies in the 10.9 to 17 GHz range that are used for fixed satellite service applications.

A band of frequencies in the 0.5 to 2 GHz range that are used primarily for voice communications.

Low earth orbit (LEO)
A satellite that orbits 400 to 1,600 miles (644 to 2,575 kilometers) above the earth's surface. 48 to 66 LEOs are needed to cover the entire earth.

Medium earth orbit (MEO)
An earth orbit in an altitude roughly midway between the earth and geosynchronous orbit. Satellite orbits between the altitudes of 1,500 and 6,500 kilometers (930 to 4040 miles) may be considered MEOs.

Orbital slot
A slot above the equator that corresponds to a particular longitude position and can be occupied by five to ten geostationary satellites.

Path diversity
An exclusive feature of the Globalstar system that allows several satellites to pick up an individual call. This assures that the call does not get dropped even if a phone moves out of sight of one of the satellites.

Public Land Mobile Network

Public Switched Telephone Network

Rake receiver
Receiver having a number of individual digital channels (tines) which can combine these channels to form a stronger received signal.

The process of locating a UT to determine which Gateway should serve it.

Return traffic circuit
A CDMA circuit to a Gateway from a user carrying user traffic and other in-band signaling. Each of these is distinguished by a unique time offset of the long code.

Occurs when a cellular or mobile satellite service customer travels outside the service area of his/her local service provider.

The portion of the electromagnetic spectrum allotted for transmission in the 2 to 4 GHz frequency range.

Service area
A geographical area on the ground that is the minimum covered by a gateway and its associated satellites. It is normally operated by a service provider.

Service link
The links between the UT and the satellite.

Short message service (SMS)*
SMS allows users to transmit short text messages of up to 160 characters. If the user if unreachable, the message will be stored in the Message Center until it can be accessed.

Short-term fade
A fade whose duration is less than the round-trip delay (including path delay) from the Gateway to the user.

Soft handoff
The process of transferring a circuit from one beam or satellite to another without interruption of the call.

Telemetry, tracking and control (TT&C)
These three functions control and monitor a group of satellites.

Component of a communications satellite that receives a signal from earth, processes and amplifies it, and then re-transmits it to another location on earth.

The portion of a satellite circuit extending from the user terminal to the satellite. The Globalstar system establishes the service uplink in the L-Band.

User terminal (UT)
Used by subscribers to communicate via the Globalstar satellites. User terminals include hand-held user terminals powered from internal batteries, mobile units powered from a vehicle battery, or fixed station units powered from fixed prime power sources.

Terrestrially-based telephone line.

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