Page 620 - Cloud computing: From paradigm to operation

3 XaaS

3.1.5 cloud service category [ITU-T Y.3500]: Group of cloud services that possess some common set of
qualities.
NOTE – A cloud service category can include capabilities from one or more cloud capabilities types.

3.1.6 cloud service customer [ITU-T Y.3500]: Party which is in a business relationship for the purpose of
using cloud services.

3.1.7 cloud service provider [ITU-T Y.3500]: Party which makes cloud services available.
3.1.8 cloud service user [ITU-T Y.3500]: Natural person, or entity on their behalf, associated with a cloud
service customer that uses cloud services.
3.1.9 Communications as a Service (CaaS) [ITU-T Y.3500]: Cloud service category in which the capability
provided to the cloud service customer is real time interaction and collaboration.
NOTE – CaaS can provide both application capabilities type and platform capabilities type.
3.1.10 infrastructure capabilities type [ITU-T Y.3500]: Cloud capabilities type in which the cloud service
customer can provision and use processing, storage and networking resources.
3.1.11 logically isolated network partition [ITU-T Y.3011]: A network that is composed of multiple virtual
resources which is isolated from other LINPs.
NOTE – Term "logically isolated", which is the counter concept of "physically isolated", means mutual exclusiveness of
the subjects (e.g., network partition, in this case), while the original subjects may be physically united/shared within the
common physical constraints.

3.1.12 Network as a Service (NaaS) [ITU-T Y.3500]: Cloud service category in which the capability provided
to the cloud service customer is transport connectivity and related network capabilities.
NOTE – NaaS can provide any of the three cloud capabilities types.

3.1.13 platform capabilities type [ITU-T Y.3500]: Cloud capabilities type in which the cloud service
customer can deploy, manage and run customer-created or customer-acquired applications using one or
more programming languages and one or more execution environments supported by the cloud service
provider.
3.1.14 tenant [ITU-T Y.3500]: Group of cloud service users sharing access to a set of physical and virtual
resources.

3.2 Terms defined in this Recommendation
This Recommendation defines the following term:

3.2.1 service chain: An ordered set of functions that is used to enforce differentiated traffic handling
policies for a traffic flow.

4 Abbreviations and acronyms

This Recommendation uses the following abbreviations and acronyms:
BGP Border Gateway Protocol

BoD Bandwidth on Demand
BSS Business Support System

CaaS Communications as a Service
CDN Content Delivery Network

CPE Customer Premises Equipment
CSC Cloud Service Customer
CSP Cloud Service Provider

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