piece of multi-media to be processed by an application

EXAMPLE A picture, a text, a movie, or a sound.

data synchronisation protocol

NOTE A data synchronization protocol defines the workflow for communication during a data synchronization session when the mobile device is connected to the network. The protocol supports naming and identification of records, common protocol commands to synchronize local and network data, and it can support identification and resolution of synchronization conflicts.

the downlink refers to that portion of a communications link used for the transmission of information from the infrastructure to each in-vehicle unit

object for data storage that can be considered as a physically undivided whole

EXAMPLE One floppy disk, one magnetic tape, a CD, or a DVD.