Page 1101 - Cloud computing: From paradigm to operation

Assisting developing countries 8

LAN Local Area Network

M&E Mechanical and Electrical
NaaS Network as a Service

OPEX Operational Expenditure
PaaS Platform as a Service

PCI DSS Payment Card Industry Data Security Standard
PUE Power Usage Effectiveness
QoS Quality of Service

SAN Storage Area Network
SaaS Software as a Service

SMB Small and Medium Businesses
SDO Standard Development Organization
SLA Service Level Agreement

UI Uptime Institute
UPS Uninterruptible Power Supply

VAS Value Added Services

5 Conventions
None.

6 Overview
According to [ITU-T Y.3500], cloud computing has been defined as "A paradigm for enabling network access
to a scalable and elastic pool of shareable physical or virtual resources with self-service provisioning and
administration on-demand."

6.1 Key characteristics

Cloud computing is a dynamic concept that keeps evolving. According to [ITU-T Y.3500], the key
characteristics of cloud computing include:
i) on demand access which allows cloud service customers (CSCs) to make use of the resources as and
when required;
ii) cost effectiveness as it readily reduces the capital expenditure (CAPEX) of organizations allowing
them to divert resources to operational expenditure (OPEX);
iii) high scalability as it offers little time to implementation enabling the CSCs to promptly customize
and adjust the cloud computing capabilities according to their needs;
iv) energy saving as the same resources are being utilized by multiple tenants; and
v) increased level of convenience as only broadband internet access is required which can be accessed
over a varied range of terminals such as tablets, laptops, workstations and mobile phones.

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