JRC jue-87, Инструкция по эксплуатации, Страница: 17 / 230

xi
CUG .......................................................................................................... Closed User Group
Private network used by the registered user only. Unregistered user cannot be accessed
from public network.
D
Data reporting:
A short data packet transmitted in burst mode on the MES signaling channel as a result
of a polling telecommand or at the initiative of the MES (operator).
Data services:
This is how a terminal may send and receive electronic messages such as e-mail.
dB ................................................................................................................................. Decibels
DB .................................................................................................................... Distress Button
DC ..................................................................................................................... Direct Current
DCE ........................................................................... Data Circuit Terminating Equipment
A component part of an Inmarsat C MES. An MES contains a DCE receiver and a DCE
transmitter, which are used for communication between the MES and an Inmarsat C
LES.
DEC ................................................................................................................ Decoder Circuit
DEL ................................................................................................................................. Delete
DEM ...................................................................................................... Demodulator Circuit
Distress alert:
In the Inmarsat-C system, a packet transmitted to an LES or an NCS on a signaling
channel by maritime MES in distress. A distress alert provides information on a ship’s
identity, position, course, speed and the nature of distress. A distress alert has the highest
priority in the Inmarsat-C system.
Distress priority message:
In the Inmarsat-C system, a store and forward message carried on a messaging channel
having Distress Priority. Used for distress communications between maritime MESs and
RCCs.
DMG .......................................................................................... Distress Message Generator
DNID ................................................................................. Data Network Identification code
See data report (unreserved), data report (reserved) and data report (pre-assigned).
Downloading:
The process by which an Inmarsat C MES receives information from a service provider.
For data reporting purposes, an operational center downloads a DNID code and Member
Number to the MES. In the EGC Fleet NET
TM
service, an information provider
downloads an EGC Network Identification (ENID) code to an MES.
DR .................................................................................................................... Data Reporting
DS .......................................................................................................................... Data Source
DTE ............................................................................................... Data Terminal Equipment
A component part of an Inmarsat C MES, used primarily for storage and interfacing
external devices (such as a keyboard or monitor). For other Inmarsat systems, this can be
a computer connected to the MES for use for data communications.
E
EDR .............................................................................................. Enhanced Data Reporting
EEPROM ................................................. Electrically Erasable and Programmable ROM
Read only Memory that is able to delete and rewrite electrically.