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+**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).
+
+..
+ vim: set tabstop=4 expandtab textwidth=80: