Page 586 - Cloud computing: From paradigm to operation

3 XaaS

1 Scope
This Recommendation provides functional architecture for desktop as a service (DaaS) to specify the detailed
functions and their relationships based on the general and functional requirements of [ITU-T Y.3503].
It addresses the following subjects:

– DaaS functions;
– DaaS functional architecture;
– mapping DaaS functional architecture to the cloud computing reference architecture.

2 References
The following ITU-T Recommendations and other references contain provisions which, through reference in
this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
were valid. All Recommendations and other references are subject to revision; users of this Recommendation
are therefore encouraged to investigate the possibility of applying the most recent edition of the
Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is
regularly published. The reference to a document within this Recommendation does not give it, as a stand-
alone document, the status of a Recommendation.

[ITU-T X.1601] Recommendation ITU-T X.1601 (2015), Security framework for cloud computing.
[ITU-T Y.3502] Recommendation ITU-T Y.3502 (2014), Information technology – Cloud computing –
Reference architecture.
[ITU-T Y.3503] Recommendation ITU-T Y.3503 (2014), Requirements for desktop as a service.

[ITU-T Y.3510] Recommendation ITU-T Y.3510 (2016), Cloud computing infrastructure requirements.

3 Definitions

3.1 Terms defined elsewhere
This Recommendation uses the following terms defined elsewhere:

3.1.1 cloud service customer [b-ITU-T Y.3500]: Party which is in a business relationship for the purpose of
using cloud services.
3.1.2 cloud service provider [b-ITU-T Y.3500]: Party which makes cloud services available.
3.1.3 DaaS client [ITU-T Y.3503]: A physical device and associated software running on the device that
collectively enable a cloud service user to access Desktop as a Service (DaaS).
3.1.4 Desktop as a Service [ITU-T Y.3503]: A cloud service category in which the capabilities provided to
the cloud service customer are the ability to build, configure, manage, store, execute, and deliver users'
desktop functions remotely.
NOTE – Examples of end user's desktop functions can include desktop interface functions for applications, data access
functions for multimedia data, and control functions for input/output (I/O) devices.
3.1.5 hypervisor [ITU-T Y.3510]: A type of system software that allows multiple operating systems to
share a single hardware host.
3.1.6 virtual desktop [ITU-T Y.3503]: An environment for accessing end user's desktop functions remotely.
3.1.7 virtual machine [b-DMTF OVF]: The complete environment that supports the execution of guest
software.

3.2 Terms defined in this Recommendation

None.

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