Optical Fibre Infrastructure Concepts and Philosophy (a brief overview)

1. Optical Fibre Infrastructure Concepts and Philosophy(a brief overview) S. Costa Machado, D. Ricci EDMS 1327034

2. Optical Fibre Infrastructure Concepts and Philosophy • Summary • Optical Fibre Infrastructure • Responsible andresponsibilities • Overview and definition • Infrastructure Topology – Star Points Organisation • CERN Optical Fibre Star Points • Definition • Actors and required procedure • Costs and pro-rata payments S. Machado – OF inftrastructure

3. Optical Fibre Infrastructure Concepts and Philosophy Responsible and responsibilities Following the agreements (JM Jouanigot & F Duval): • The section EL-CF provides optical fibre installations and components to all CERN users. • EL-CF takes care of the management of the OF infrastructure. The management of the OF infrastructure includes several responsibilities, such as: • Ensure corrective and preventive maintenance. • Ensure enough capacity between OFSP for fulfilling the needs of the CERN on-going projects and requests; • Ensure that all new connections are properly executed and measured; • Ensure that the OFSP is efficiently used for covering the actual and future geographical needs. S. Machado – OF inftrastructure

4. Optical FibreInfrastructure Concepts and Philosophy Overview and definition • The optical fibre infrastructure is organised and interconnected by Star Points. For understanding this concept, an important distinction must be made: • Optical Fibre Star Points contains only optical fibre passive components and are there for optimising and give flexibility to the optical infrastructure. • IT Star Points (Copper) is a terminal point from the fibre point of view. It contains the active equipment and is where the Ethernet cables are installed for several users. • The increased number of requests requires a very efficient and shared optical fibre infrastructure for being capable to serve all CERN users. • The organisation of the Star Points is the key, and the way they are implement is what gives flexibility for the infrastructure to be upgraded faster and efficiently. • However, the creation of new optical fibre star points is not trivial, then the existent ones must be “well” used. Example of Interconnection of Star Points CC513 – CCC – LHC Surface – LHC Service area – LHC Alcoves S. Machado – OF inftrastructure

5. Optical FibreInfrastructure Concepts and Philosophy Infrastructure Topology – Star Points Organisation • Historically the optical fibre Infrastructure built for IT user at Prevessin site, as followed a star topology from the main geographical Star point: CCC. • This topology: • limits sharing of ducts infrastructure; • increase the dimension and complexity of the Infrastructure; • increases the congestion at the main star point and technical galleries; • increases the overall cost and complexity of interventions. Need for changes Example of a part of IT optical fibre Infrastructure at Prevessin site S. Machado – OF inftrastructure

6. Optical Fibre InfrastructureConcepts and Philosophy Infrastructure Topology – Star Points Organisation • An optical fibre Infrastructure based on a Star Point distribution presents several advantages for all CERN users. • This topology: • allows sharing of cable trays and ducts infrastructure and consequently it is easily upgradable; • increases the efficiency of the Infrastructure and reduction of the congestion at the main star points (eg. CCC); • decreases the number of interventions. Example of future implementation of optical fibre Infrastructure. S. Machado – OF inftrastructure

7. Optical FibreInfrastructure Concepts and Philosophy CERN Optical Fibre Star Points • Definition • An Optical Fibre Star Point (OFSP) is a interconnection point from where several optical fibre links are terminated following a star topology. Each OFSP is unique and has a unique geographical position, however it can be built differently: • Case1: by several racks belonging to the same room. For example: CCC/R-020, CC-513/R-014, 354/R-03 • Case 2: by a single rack; For example: BA5/R-012(RA2607) or BA81/R-009(RA2929) • Case 3: by one or more sub-racks located inside a rack. For example: 263/1-001, 80-S, 3191/RL0 Fibre racks or sub-racks must be managed by one team only in order to be efficient. EL being in charge of the infrastructure is the manager. . S. Machado – OF inftrastructure

8. Optical FibreInfrastructure Concepts and Philosophy CERN Optical Fibre Star Points • Actors and required procedure • The section EL-CF and IT-CS are the only actors in all OFSP; • FOR EL-CF • After receiving a new request, EL-CF will take care of: • identifying the available capacity; • informing the respective user about the delivery time for the connection; • reservation of the requested optical fibre links; • EL-CF will take care of information update. S. Machado – OF inftrastructure

9. Optical Fibre InfrastructureConcepts and Philosophy • Initial costs used to be charged exclusively on users • - Common infrastructure costs are difficult to spread on (unknown) users • - IT was paying more than its stake • Decision was made (Duval / Jouanigot) EL will continue asking for a “backbone” (consolidation and upgrade) budget from EN Department to cover the initial investment. • Pro-Rata payments • - EL-CF will procure budget for upgrading the links between existent optical fibre star points and anticipate needs; • - The creation of new optical Star Point related with new projects shall be financed by the project; • - Users will contribute according to the pro-rata of requested fibres • Via a TID for the meantime • Via an internal contract Y202 in the future Costs S. Machado – OF inftrastructure