ProSoft Technology PLX8X-MNET-61850 - Manual (Page 219)

PLX8x-MNET-61850 ♦ Communication Gateway Glossary of Terms
Modbus TCP/IP to IEC 61850 User Manual
ProSoft Technology, Inc. Page 219 of 228
May 14, 2014
Server
On a communication network, a functional node that provides data to, or that
allows access to its resources by, other functional nodes. A server may also be a
logical subdivision, which has independent control of its operation, within the
software algorithm (and/or possibly hardware) structure.
Server Class
External visible behavior of an IED or application process.
Service
Functional capability of a resource which can be modeled by a sequence of
service primitives.
Service Access Point
Represents a logical construct through which a peer selects a communication
protocol or access to an application. The selection of the entire seven layers of a
service access point represents a communication profile.
Service Primitive
Abstract, implementation-independent representation of an interaction between
the service user and the service provider.
Session Layer
Layer 5 of the OSI reference model for Open Systems Interconnection. It
manages the establishment and release of session connections, and also the
synchronization of data exchange between presentation entities.
SF6
Sulphur Hexafluoride gas, used as an insulating medium in gas-insulated circuit
breakers and associated plant.
Site Acceptance Test
Verification of each data and control point and the correct functionality inside the
SAS and between the SAS and its operating environment on the whole installed
plant using the final parameter set. The site acceptance test is the pre-condition
for the SAS being accepted and put into service.
Specific Communication Service Mapping
Standardized procedure which provides the concrete mapping of ACSI services
and objects onto a particular protocol stack/communication profile.
To reach interoperability, it is intended to have a minimum number of profiles and
corresponding Specific Communication Service Mapping (SCSM). Special
application sub-domains such as 'station bus' and 'process bus' may result in
more than one mapping. However, for the specific protocol stack selected, only
one single SCSM and one single profile should be specified.