**Definition of terms**
Different SDOs and communities use different terminology related to
NFV/Cloud/SDN. This list tries to define an OPNFV terminology,
mapping/translating the OPNFV terms to terminology used in other contexts.
.. glossary::
ACT-STBY configuration
Failover configuration common in Telco deployments. It enables the
operator to use a standby (STBY) instance to take over the functionality
of a failed active (ACT) instance.
Administrator
Administrator of the system, e.g. OAM in Telco context.
Consumer
User-side Manager; consumer of the interfaces produced by the VIM; VNFM,
NFVO, or Orchestrator in ETSI NFV [ENFV]_ terminology.
EPC
Evolved Packet Core, the main component of the core network architecture
of 3GPP's LTE communication standard.
MME
Mobility Management Entity, an entity in the EPC dedicated to mobility
management.
NFV
Network Function Virtualization
NFVI
Network Function Virtualization Infrastructure; totality of all hardware
and software components which build up the environment in which VNFs are
deployed.
S/P-GW
Serving/PDN-Gateway, two entities in the EPC dedicated to routing user
data packets and providing connectivity from the UE to external packet
data networks (PDN), respectively.
Physical resource
Actual resources in NFVI; not visible to Consumer.
VNFM
Virtualized Network Function Manager; functional block that is
responsible for the lifecycle management of VNF.
NFVO
Network Functions Virtualization Orchestrator; functional block that
manages the Network Service (NS) lifecycle and coordinates the
management of NS lifecycle, VNF lifecycle (supported by the VNFM) and
NFVI resources (supported by the VIM) to ensure an optimized allocation
of the necessary resources and connectivity.
VIM
Virtualized Infrastructure Manager; functional block that is responsible
for controlling and managing the NFVI compute, storage and network
resources, usually within one operator's Infrastructure Domain, e.g.
NFVI Point of Presence (NFVI-PoP).
Virtual Machine (VM)
Virtualized computation environment that behaves very much like a
physical computer/server.
Virtual network
Virtual network routes information among the network interfaces of VM
instances and physical network interfaces, providing the necessary
connectivity.
Virtual resource
A Virtual Machine (VM), a virtual network, or virtualized storage;
Offered resources to "Consumer" as result of infrastructure
virtualization; visible to Consumer.
Virtual Storage
Virtualized non-volatile storage allocated to a VM.
VNF
Virtualized Network Function. Implementation of an Network Function that
can be deployed on a Network Function Virtualization Infrastructure
(NFVI).
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