Data model¶
The OFDS data model is a logical model that sets out the entities, attributes and relationships needed to describe a fibre network, without specifying how to represent them in a particular data format. This page provides an overview of the data model and reference tables for each entity.
See also
OFDS also defines standardised representations of the data model in different data formats, which can be used to store, publish or exchange OFDS data.
Overview¶
The following diagram provides an overview of the key entities and relationships in the OFDS data model.
---
config:
layout: elk
---
erDiagram
Network {
}
Contract {
}
Node {
}
Organisation {
}
Phase {
}
Span {
}
Wayleave {
}
Network ||--o{ Node : "Consists of"
Network ||--o{ Span : "Consists of"
Network ||--o{ Phase : "Deployed in"
Node }o--|| Organisation : "Transmission medium owned by"
Node }o--|| Organisation : "Supporting infrastructure owned by"
Node }o--|| Organisation : "Active infrastructure operated by"
Node }o--|| Phase : "Deployed in"
Span }o--|| Node : "Starts at"
Span }o--|| Node : "Ends at"
Span }o--|| Organisation : "Transmission medium owned by"
Span }o--|| Organisation : "Supporting infrastructure owned by"
Span }o--|| Organisation : "Active infrastructure operated by"
Span }o--|| Organisation : "Installed by"
Span }o--|| Phase : "Deployed in"
Contract }o--|| Phase: "Agreement to develop"
Phase }o--|| Organisation: "Financed by"
Wayleave }o--o{ Span: "Grants rights for installation, operation and maintenance of"
Wayleave }o--|| Organisation: "Rights granted by"
classDef spatial fill:#f3ffa6ff,stroke:#bbd034
classDef non-spatial fill:#cec7ffff,stroke:#110e27
class Node,Span spatial
class Network,Organisation,Phase,Contract,Wayleave non-spatial
direction LR
See also
For an introduction to key concepts and relationships covered in the OFDS data model, read the scope, focus and key concepts primer.
Entities¶
This section provides a definition for each entity in the data model, including a description, relationships to other entities, and attributes.
Some attributes refer to codelists to limit and standardise the possible values of the attribute. In such cases, a link to the codelist is provided in the attribute’s description.
Network¶
Phase¶
Node¶
Span¶
Additional information
Equipped capacity
Span.capacity is defined as the equipped capacity of a span:
The transmission rate, or throughput, of this span, expressed in Gbit/sec (Gbps). The equipped capacity is the total capacity of the circuits (e.g. E1, DS3, STM-1 etc.) which have been activated in the network transmission equipment of the span. For spans with multiple network providers, the sum of the capacity of each provider’s network on this span. Further details of this span’s capacity can be provided in
.capacityDetails. For more information, see equipped capacity.
There are several measures of capacity in fibre networks[1]:
Potential capacity refers to the total theoretical bandwidth that is available, including lit (turned on) and unlit (dark fibre) capacity.
Equipped capacity, also known as lit capacity, refers to bandwith that is turned on and ready for use.
Purchased capacity, also known as contracted capacity, covers bandwidth put into service, but not all of which is used; some is held in reserve for restoration or redundancy
Used capacity covers bandwidth that is available to carry traffic.
