Optical Fibre Infrastructure Management: Concepts and Responsibilities

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