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WHOI-90-52

WHOI-90-52

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Basic Services and Inruentation Opportnities in Mobile Satellte Communication<br />

Background<br />

John Fuechsel<br />

Martime Service, COMSA T<br />

COMSA T is the designate representative of the Unite States to both INELSA T (International<br />

Point Satellte System) and INARSAT (International Martime Satellte System). In addition<br />

to being a martime satellte system, INARSA T is also becmig a mobile system for<br />

aeronautica and land mobile uses.<br />

COMSAT's products have definite potential for application to mare instrmentation. We do<br />

not supply the equipment to our clients, just satellte accss. Equipment manufacturers sell<br />

terminals which are ty approved for use in the INRSA T system.<br />

COMSAT has extensive oversight by U.S. governmenta agencies. The Deparment of State<br />

directs positions to be taen in meetings of the council -- INRSA T's board of directors. The<br />

FCC regulates COMSA T as a common caer, approves COMSA T's taffs and limits market<br />

entr through its jurisdictional procss.<br />

The National Telecommunicating and Information Administrtion (NT A) is the chief of staf for<br />

government telecmmunications policy. House within the Depament of Commerce, its role<br />

is to act as a liasion between the varous government oversight agencies and COMSA T. The<br />

Coast Guad overses safety issues. Since INMARSA T began as a safety system it has taen on<br />

a major saety role under IMO (International Martime Organization).<br />

COMSAT's ~<br />

COMSA T' s service offerings, for Stadard-A ship-ea stations in the INARSA T system have<br />

both telex and voice capabilties; these are interconnected with public switched networks. Telex<br />

ca be thought of as the common denominator -- one ca send a message anywllere in the world<br />

with telex. Telex, however, is not a parcularly efficient service since it only runs at 50 baud<br />

and cost $4.00 per minute. High volume customers do much better trsmitting data using the<br />

voice channel since it is easier to achieve a throughput of 2400 bits per send at $10.00 per<br />

minute.<br />

65

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