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 0003 00
TM 11-5895-1847-12&P
DESCRIPTION OF THE INMARSAT-C TRANSCEIVER
The INMARSAT-C transceiver (7) is a component of the satellite communication system. The transceiver will
automatically perform a login when the transceiver power is turned on. A manual login is required if a logout was
performed and the transceiver power was not turned off or operation in a different ocean region is desired. The
transceiver can be operated in one of two modes, normal and terminal. The terminal mode is available for users
wanting to customize the system to a degree not available from the windows of the message handling software. In
terminal mode, the user is in direct contact with the transceiver and able to issue commands by typing them from
the keyboard.
The transceiver is a message center containing transceiver and GPS status reports, in addition to the message log and
poll files. All incoming and outgoing messages are recorded in special log files. Each log file may hold as many as
50 messages. The names of the log files have a special layout such as: LOG09-03.001, LOG10.93.001 or
LOG10.93.002 where09 and 10 are September and October respectively. 93 is the year.001 and002 is a sequential
number within each month. A new log file is generated when a new month begins or when the size of the file gets
larger than 100 Kb.
A poll is a message, but it differs from normal messages in that it can only be sent from a terrestial user (TELEX, x.25
or telephone modem), a mobile unit, and in that it may simultaneously be received by several units. A poll can be
addressed to one specific mobile, a group of mobiles or a group of mobiles within a specified geographic or
navigational area. The reception of a poll can initiate the transmission of a position report or trigger some other pre-
defined event. As shipped, the INMARSAT-C only supports transmission of position reports in response to a poll.
When an INMARSAT-C unit responds to a poll, the response is either forwarded to the terrestial user at once or it is
stored at the land station for later retrieval. When receiving a poll the transceiver will generate a file containing the
data of the poll. These files will be named POLLFILE.000, POLLFILE.001, etc. On the data terminal the files will be
placed in the start-up directory. No further action will be taken.
The transceiver also utilizes the Data Network ID (DNID). The DNID is a unique number, which serves as a link
between the terrestial user and the mobile units. For example, the DNID is used when the terrestial user issues a poll
and also when the mobile responds. A user may have several DNIDs. When several mobiles have the same DNID,
this is called a group. Each user in a group is also designated a member number, which enables a terrestial user to
differentiate between the users in a group. This is especially important when responses from the users are processed
at the premises of the terrestial user. The user interface allows the user to enable or disable DNIDs. If a DNID is
disabled you will not receive any poll with this DNID or be able to use it for position reporting.
DESCRIPTION OF THE INMARSAT-C DATA TERMINAL
The INMARSAT-C data terminal (8), located on the flag case, is a component of the satellite communication system.
The data terminal is composed of a computer, Alternating Current (AC) adapter and battery pack. The data terminal is
used to compose e-mail messages, TELEX messages and FAX to be sent using the satellite communications system.
In addition, the data terminal allows the operator to perform file management and print information received
or transmitted.
DESCRIPTION OF THE INMARSAT-C PRINTER
The INMARSAT-C printer (9), located on the flag case, is a dot matrix printer capable of printing 240 characters per
second in draft mode. The INMARSAT-C printer prints e-mail, TELEX and MSI messages received through the
satellite communications system.
DESCRIPTION OF THE INMARSAT-C DATA TERMINAL/INMARSAT-C PRINTER AUTO SWITCH
The INMARSAT-C data terminal/INMARSAT-C printer auto switch provides switching for information received
from the INMARSAT-C. The information is automatically switched between the INMARSAT-C data terminal and
the INMARSAT-C printer. The auto switch is located on the shelf behind the 9701 GMDSS console.
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