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2) Communication services
TELEX: The MES can send and receive messages to and from a telex terminal
connected to the international telex networks.
The standard alpha-numeric character set known as Telex or ITA2 or 5-bit
packeted.
This character set is based on 5-bit codes, and supports only upper case
characters, so any lower case characters entered on your MES will be received
at the destination as upper case.
Note that if the destination is a Inmarsat C terminal, this limitation is ignored.
PSTN (Public Switched Telephone Network):
The MES can send and receive messages to and from a computer or E-mail
service on the international PSTN (telephone) landlines. If the land subscriber
uses a modem T30 FAX, the MES can send messages to the fax.
PSDN (Packet Switched Data Network):
The MES can send and receive messages to and from a computer or E-mail
service on the international PSDN (data) landlines.
These networks are also known as the X.25 networks.
The Internet E-mail service uses this network.
X.400 (Electronic Mail):
The MES can send and receive messages to and from registered subscribers to
E-mail services which use the X.400 communications standards (protocol) on
the PSDN landlines.
This service is not available yet.
DNID (Data reporting Network ID):
For a data reporting closed network, the owner/shipping company must register
the MES with the relevant operational center. The center arranges with an
Inmarsat-C CES to download data reporting network identification information,
comprising a data network identification (DNID) code and a member number
within the group.
CSDN (Circuit Switched Data Network):
This service is not available yet.
SPEC: 2-digit codes
Special service provided by a LES is accessible, using a special access code.
Two-digit codes are examples of special access code.
E-mail: E-mail can be sent through the LES which supports E-mail service.
The MES must register with the LES at first time and use the mail format
specified by each LES.
22.5k byte image file can be attached to the E-mail if the LES supports.
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