3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in OPC 10000‑4, OPC 10000-80, OPC 10000-100, IEEE Std 802‑2014, IEEE Std 802.1AS‑2020, IEEE Std 802.1AB‑2016, IEEE Std 802.1Q‑2022, IEEE Std 1588, as well as the following apply.
All used terms are italicised in this document as described in OPC 10000‑1.
3.1.1 Bridge
system that includes Media Access Control (MAC) Bridge or Virtual Local Area Network(VLAN) Bridge component functionality.
3.1.2 Bridge Component
set of Bridge functionalities necessary for acting as a traffic relay station in a network
3.1.3 device
independent physical entity capable of performing one or more specified functions in a particular context and delimited by its interfaces
3.1.4 end station
A functional unit in an IEEE 802® network that acts as a source of, and/or destination for, link layer data traffic carried on the network
3.1.5 End Station Component
implementation of an end station
3.1.6 Global Time
synchronised time in a network clock derived from a gPTP domain that is traceable to International Atomic Time
3.1.7 Grandmaster Clock
in the context of a single PTP domain, the synchronized time of a PTP Instance that is the source of time to which all other PTP Instances in the domain are synchronized
3.1.8 Grandmaster PTP Instance
3.1.9 IA-station
material element or assembly composed of one or more End Station Components and zero or more Bridge Components
3.1.10 PTP End Instance
[SOURCE: IEEE Std 802.1AS 2020, 3.21]
3.1.11 PTP Instance
Note 1 to entry: A PTP Instance implements the portions of IEEE Std 802.1AS indicated as applicable to either a PTP Relay Instance or a PTP End Instance.
3.1.12 PTP Relay Instance
[SOURCE: IEEE Std 802.1AS‑2020, 3.24]
3.1.13 UAFX Application
OPC UA Application that includes UAFX functionality
3.1.14 UAFX Station
IA‑station supporting the OPC UA FX communication and application layer
3.1.15 Working Clock
synchronised time in a network clock derived from a gPTP domain that is traceable to an arbitrary timescale or to the PTP timescale
3.2 Abbreviated terms
| BMCA | Best Master Clock Algorithm |
| CM | Connection Manager |
| DHCP | Dynamic Host Configuration Protocol |
| DNS | Domain Name System |
| DSCP | Differentiated Services Code Point |
| gPTP | Generalised Precision Time Protocol |
| IETF | Internet Engineering Task Force |
| LLDP | Link Layer Discovery Protocol |
| LLDPDU | LLDP Data Unit |
| MAC | Media Access Control |
| mDNS | Multicast DNS |
| NTP | Network Timing Protocol |
| PCP | Priority Code Point |
| PTP | Precision Time Protocol |
| QoS | Quality of Service |
| RFC | Request for Comments |
| TC | Traffic Class |
| TDE | Topology Discovery Entity |
| TE-MSTID | Traffic Engineering Multiple Spanning Tree Instance Identifier |
| TLS | Transport Layer Security |
| TLV | type-length-value |
| TSN | Time-Sensitive Networking |
| VID | VLAN ID |
| VLAN | Virtual Local Area Network |
| WLAN | Wireless Local Area Network |
3.3 Conventions used in this document
3.3.1 Conventions for block diagrams
Block diagrams are used in figures throughout this document to illustrate groupings of functionality. The blocks in these diagrams represent abstract concepts and are not meant to imply a particular implementation.
3.3.2 Usage of Instance of a type
In this document, the name of a type without the inclusion of “Type” indicates an instance of the type. For example, the following phrase, “an instance of ConnectionConfigurationSetType,” can be replaced with “a ConnectionConfigurationSet”. The phrase “instances of ConnectionEndpointType” can be replaced with “ConnectionEndpoints”.