Page 783 - Cloud computing: From paradigm to operation

Video processing and storage 4

3.1.6 functional entity [ITU-T Y.2012]: An entity that comprises an indivisible set of specific functions.
Functional entities are logical concepts, while groupings of functional entities are used to describe practical,
physical implementations.
3.1.7 interface [ITU-T Y.101]: A shared boundary between two functional units.
NOTE – An interface is defined by various characteristics pertaining to the functions, physical interconnections, signal
exchanges and other characteristics as appropriate.
3.1.8 premises unit [ITU-T H.626]: A device located at the remote part of a visual surveillance system and
used to capture multimedia information (such as audio, video, image, alarm signal, etc.) from a surveilled
object.

3.1.9 reference point [ITU-T Y.2012]: A conceptual point at the conjunction of two non-overlapping
functional entities that can be used to identify the type of information passing between these functional
entities.
NOTE – A reference point may correspond to one or more physical interfaces between pieces of equipment.

3.1.10 service [ITU-T Y.101]: A structure set of capabilities intended to support applications.
3.1.11 visual surveillance [ITU-T H.626]: A telecommunication service focusing on video (but including
audio) application technology, which is used to remotely capture multimedia (such as audio, video, image,
alarm signal, etc.) and present them to the end user in a user-friendly manner, based on a managed
broadband network with ensured quality, security and reliability.

3.2 Terms defined in this Recommendation

This Recommendation defines the following terms:
3.2.1 cloud storage access unit (CSAU): A device located at a cloud storage system in visual surveillance.
The CSAU is the key unit for implementing communication between the CSDU and the MDU, PU and the
other media data related units defined in visual surveillance. The functions of the CSAU include service
control function, media control function and configuration management function.

3.2.2 cloud storage data unit (CSDU): A series of devices located at a cloud storage system in visual
surveillance. The CSDU is the data node in a cloud storage system that is used to store the massive multimodal
data produced by the visual surveillance system. A typical visual surveillance cloud storage system consists
of a number of CSDUs, which is organized in a distributed way. The CSDU can be dynamically extended
according to the user's demand. The CSDU can receive the media data from the CSAU and write the data
onto its local storage device. In addition, the CSDU can read and transmit the stored data to the CSAU
according to the data reading requests.
3.2.3 cloud storage management unit (CSMU): A device located at the central part of a cloud storage
system in visual surveillance. The CSMU is used to provide the management services of the cloud storage
system and respond to the service requests of the visual surveillance system. The main functions of the CSMU
include supporting storage resource management, data management, user management, service
management, log management and security control.

4 Abbreviations and acronyms
This Recommendation uses the following abbreviations and acronyms:

CMU Centre Management Unit
CSAU Cloud Storage Access Unit
CSDU Cloud Storage Data Unit

CSMU Cloud Storage Management Unit
CU Customer Unit

IPU Intelligent Premises Unit

775