Satellite Phone Industry Definitions Glossary – Globalcom

Satellite Phone Industry Definitions Glossary

CDMA: Code Division Multiple Access Pioneered by Qualcomm the CDMA signal provides excellent data and voice capacity through the Globalstar satellite phone network of 48 satellites. The CDMA signal is the foundation for 3G communication services world wide. CDMA converts speech signal into digital format and then transmits it from the Globalstar Satellite phone up to the satellite systems and down to the ground station. Every call over the satellite network has its own unique code which distinguishes it from the other calls sharing the airwaves at the same time. The CDMA signal is without interference, cross talk or static. CDMA was introduced in 1995 and soon become the fastest growing wireless technology. Globalstar chose this technology for use in it satellite communication network when Globalstar launched service in 2000.

Iridium: Iridium’s sixty-six satellite network provides truly global service. Calls go from your phone up to the satellite, which passes the call satellite to satellite until it downlinks at the Hub station in Tempe, Arizona. From Tempe, all calls are routed via terrestrial lines to their final destination. Calls from one terminal to another go up to the satellite network and directly down to the called handset, bypassing the terrestrial phone network.

Globalstar: Globalstar has a constellation of 48 Low-Earth Orbiting (LEO) satellites that pick up signals from over 80% of the Earth’s surface, (except the extreme Polar Regions and some mid-ocean regions). When several satellites pick up a call, this “path diversity” reduces the possibility of blocked or dropped calls. If buildings or terrain block the phone’s line-of-sight to a satellite, a “soft hand-off” will take the place switching the call to an another satellite with no interruption. This satellite continues transmission of the original signal to one of several terrestrial “gateways.”

Gateway: A satellite gateway is transmits and received all traffic which is send through terrestrial land-line and cellular networks. The Gateway carries out all the processing and switching of the calls rather than the satellite itself.

Satellite Phone: Can be handheld, fixed or portable and utilizes satellites that can be stationary or orbiting. As long as the user has line-of-site to one of the satellites in the coverage area of the satellite service provider the user would have service. Services can include voice, data, SMS, and fax.

Prepaid Service: This service allows the user to purchase a bundle of minutes that are usually valid for one year. The user avoids credit check, monthly fees and annual contacts. In most cases the prepaid sim card can be recharged at anytime which renews the service for one year.

Postpaid Service: This service allows the user to have package minutes either monthly or annually similar to cellular service. This service is normally without a limit on the minutes used by the customer.

Serial Port: The data kit on both the Globalstar and Iridium hand held phones include a serial port which will give the user access to the Internet. If the user does not have a serial port on their PC and USB to serial adapter is available.

Data Kit: A data kit is available for both the Globalstar and Iridium satellite phones. The data kit consist of a data cable and CD which would allow the user to have dial up or direct Internet access through a serial port of a PC

Docking Station: Globalstar offers a docking station which is basically a Car Kit modified to be portable. It would include a hard or soft case, external antenna, antenna cable, microphone for hands free operation and a cigarette lighter adapter. The docking station allows the user to easily move the phone from vehicle to vehicle. The magnetic low profile antenna included with the unit would need to be located with an 80% view of the sky to give good service.

SMS: Inbound short text messaging is free to the user of a Globalstar or Iridium phone. Anyone with access to the Internet can send a short text message up to 160 characters to an Iridium phone or 19 characters to a Globalstar phone. The user would be prompted by the phone when receiving a message.

Roam: Globalstar users will roam outside the Globalstar home calling area of the U.S. and eastern Caribbean. This rate varies depending on where the user travels. Iridium on the other hand does not roam. The flat minute rate is from anywhere on the planet to virtually everywhere.

Fixed Site Satellite Phone: This unit is designed for use on a building. When the customer needs a unit that will work inside a building the Fixed Site Satellite Phone includes an antenna which would need to be installed outside with 80% view of the sky allowing of line-of-site to one of the satellites. The Globalstar fixed site unit allows you to have multiple extension line utilizing off the shelf analog desktop or cordless phones.

Simplex Satellite Modem: battery-operated, wireless data devices that integrate the Globalstar Simplex Transmitter Unit. These units are ready-to-go out of the box and easy to install. Both have batteries with a 2 year life that can be easily replaced in the field. Power consumption estimates based 6 messages per day. Simplex messages are transmitted via the Globalstar low-earth orbit satellite network, using an uplink-only connection (one-way data transmission). Multiple messages are sent over several minutes at each transmission interval to ensure reception. Once the Globalstar system confirms a message it ensures repeats are deleted for efficiency. Customer only pays for first confirmed message.

Duplex Satellite Modem: The GSP-1620 SDM provides 96 Kbps data service using the 48 LEO Globalstar satellite constellations. The Direct Internet Access gives you connectivity to the Internet and email systems. With this option you are not required to have an Internet Service Provider (ISP) Globalstar acts as your ISP. The GSP-1620 SDM is a Hayes compatible modem.

Solar Panel: The portable solar panels provided by GlobalCom allow the user to charge most any electronic device through a male cigarette lighter adapter. Portable solar panels GlobalCom provides range from 14.5 to 25.1 watts

Line-of-site: the majority of satellite communication devices require clear unobstructed “line-of-site” to the satellite they are attempting to communicate with. The more this line-of-site is obstructed by trees and structures the more likely the user will experience dropped calls and periods of no service.

LEO: Low earth orbiting satellites Globalstar has a constellation of 48 satellites that are 700 miles in orbit. Iridium utilizes a 66 satellite constellation that gives the user of an Iridium phone virtually coverage everywhere on the planet.

Path diversity: Globalstar uses redundancy with every call a customer places. A call is routed through as many as four satellites which then combine the signal into a single static free call. If one of the paths to one of the satellites is blocked the other satellites keep the call from terminating. This is called (Path Diversity) which minimizes dropped calls and enhances the quality of the calls made on a Globalstar phone.

Soft hand off: If buildings or terrain block the phone’s line-of-sight to a satellite, a “soft hand-off” will take the place switching the call to an another satellite with no interruption. This satellite continues transmission of the original signal to one of several terrestrial “gateways.”

Bent Pipe technology: Globalstar’s (Bent-Pipe Technology) allow the call to be first beamed up to the satellite and then retransmitted to a relatively close gateway. The call is then sent through to its call destination through land-line or cellular networks. The Globalstar Gateway carries out all the processing and switching of the calls rather than the satellite itself. This improves the reliability of the call delivery.

If you need more help understanding the terms used for the satellite phone industry feel free to Contact Us