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Communications Electronics Sales And Service Specialists. 406 889 3183- EMail: pstramer@eurekadsl.net Scroll down for products. |
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800 889 2839 or 800 796 0592 Hours: 8:00 AM - 8:00 PM We do not accept credit cards from outside the USA and Canada 
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GLOBALSTAR NETWORK OF SATELLITES
| How is Globalstar able to provide such a reliable and dependable
communications service? Here is a brief overview of some elements that
contribute to the exceptional service and coverage of Globalstar: Technology / LEO Satellites A Low Earth Orbit (LEO) is any Earth orbit up to approximately 1,500 kilometers in altitude. Low-Earth-Orbit satellite systems offer significant advantages over Geosynchronous (GEO) systems for the delivery of mobile satellite services (MSSs). These advantages result from an orbit selection that enhances the quality of services to low-power mobile hand-held and vehicle-mounted user equipment. GEO satellite systems, located at an altitude of 35,800 kilometers above the Earth, are best suited for their missions of high-speed data, television transmission, and other wideband applications. Mobile users, however, need systems that are specifically tailored to their needs. The true mobile user requires hand-held and vehicle-mounted telephone devices with omnidirectional antennas that are easily portable and can provide instant access to a global communication system. Furthermore, telephone users desire and require "telephone quality" transmissions. These users do not want long propagation delays inherent in GEO systems that produce the echo effect and also use bulky, expensive, directional antennas which must point or must be pointed at a satellite. Also, technical limitations of current GEO satellite systems severely limit the capacity of such systems to service mobile users. The scarce spectrum available for MSSs communications requires deployment of systems that will provide services to the users in a manner that maximizes the use of spectrum while encouraging a multiplicity of systems to share the spectrum. GEO systems, as presently configured with frequency division multiple access-frequency modulation (FDMA-FM), require inefficient band segmentation to share the spectrum. Globalstar will provide capacity even when a satellite fails, due to the rotation of its LEO constellation. A GEO system, by contrast, would suffer an entire regional system outage if an operational satellite were to fail. Also, current and planned GEO systems cannot service the personal communications market due to the expense of supplying adequate satellite power and practical deployable antenna sizes. Technology / Path Diversity Path Diversity is a patented method of signal reception that permits the combining of multiple signals of varying power strengths into a single, coherent signal. Subscriber terminals will be able to operate with a single satellite in view, though typically two to four satellites will be overhead. Subscriber terminals will communicate with as many as three satellites simultaneously and, utilizing a rake receiver, will combine those signals into a single, static free signal. Subscriber terminals will also alter their power levels to compensate for shadowing and interference as needed, with an average power output range of between 50-300 mw. As satellites are constantly moving in and out of view, they will be seamlessly added to and removed from the calls in progress, thereby reducing the risk of call interruption. This will enable the Globalstar system to provide service to a wide variety of locations, with less potential for signal blockage from buildings, terrain or other natural features. Technology / CDMA Technology Globalstar utilizes a version of Code Division Multiple Access (CDMA) technology based upon the IS-95 CDMA standard to provide high quality, digitally crisp voice, data, and fax services. This standard utilizes digital transmission methods in which users share time and frequency allocations, and are assigned by unique assigned codes. The signals are separated at the receiver by using a correlator that accepts only signal energy from the desired circuit. Undesired signals are ignored as merely being noise. This technology allows a large number of wireless users simultaneously to access a single radio frequency channel orthogonally reducing interference, thereby resulting in a manyfold increase in capacity when compared to analog systems such as Frequency Division Multiple Access (FDMA). The CDMA concept is analogous to the situation encountered at a party. At the "CDMA Cocktail Party," all subscribers are talking in the same room together simultaneously. This is analogous to the technique used in CDMA. Imagine that every conversation in the room is being carried out in a different language that you do not understand. They would all sound like noise from your perspective. If you "knew the code," the appropriate language, you could imagine filtering out the unwanted conversations and listening only to the conversation of interest to you. A CDMA system must filter the traffic in a similar way. Even with knowledge of the appropriate language, the conversation of interest may not be completely audible. The listener can tell the speaker to speak more loudly, and can also signal other people to speak more softly. A CDMA system uses a similar power control process. Globalstar has adapted a combination of FDMA with CDMA and spread spectrum modulation that enables it to support multiple users simultaneously, and to share its allocated frequencies with other CDMA systems. Globalstar believes that CDMA, combined with the path diversity offered by multiple satellites, results in higher call quality and fewer dropped calls when handing off between satellites, while minimizing interference with other users sharing the same spectrum allocation. |
| Why Globalstar? |
| When your business centers around remote worksites and working in
remote areas beyond cellular and traditional landline service, reliable
communications are vital to your success. Discover the advantages
Globalstar products and services offer that can help improve your
business efficiency and productivity.
Affordability With minutes starting as low as 14 cents Globalstar satellite service is affordable for any business operating in remote areas. Price plans start at $50 Clarity of Voice CDMA (Code Division Multiple Access) technology makes Globalstar calls exceptionally secure and clear, with high quality voice transmissions. No Perceptible Voice Delay Use of Low-Earth Orbiting (LEO) satellites, moving at an altitude of 1,414 kilometers, helps virtually eliminate voice delay, compared to the noticeable time delay and echo effect of calls on geosynchronous satellites which orbit at much higher elevations. Reliability The Globalstar system software resides on, and is monitored from the ground, for quick and economical system maintenance and upgrades. Lighter, Three-in-one Handsets The Globalstar GSP-1600 mobile phone is three phones in one with built-in technology to easily access 800 MHz analog cellular, digital CDMA cellular, as well as the Globalstar satellite system. Many accessories such as car and marine kits are available which greatly extend the phones capabilities and value. Superior Data Speeds Globalstar offers the fastest satellite data speeds of any handset in the industry allowing you to transfer your data quickly. |
| Frequently Asked Questions |
| Globalstar
is an innovative, dependable and affordable satellite-based telephone
service that enables to have the power to communicate virtually
anywhere, anytime. The Globalstar system provides affordable mobile
satellite services, including basic voice telephony and 9.6KBps data
communications. Globalstar also offers an array of enhanced
telecommunications services, such as remote monitoring applications,
pre-paid phone cards and text messaging.
When was Globalstar made available in North America? Who has subscribed to Globalstar services?
Also, in rural or underserved areas where landline phone service doesn't exist or is of poor quality, Globalstar can provide voice and data service through it's fixed user terminals.
How much do Globalstar Phones and Services cost? Airtime Rates
Do Globalstar satellite phones work just like cell phones? What are the differences between the FAU-200 and the GSP-2900 Fixed Satellite Phones? The following chart outlines the differences between the FAU-200 and the GSP-2900 fixed satellite phones.
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GLOBALSTAR NETWORK OF SATELLITES
Voice Rate Plans
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