Datacentre ICT Technology
Inside a Datacenter
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Inside a Datacenter
The lesson opens broadly: what a datacentre is, how equipment is organised, how power and network links are made reliable, and how work is managed safely and professionally.
Learning goal
I can explain how a datacentre is organised and how power, network connections, racks and procedures work together to keep services available.
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What words do you connect with a datacentre?
Use this as prior knowledge activation. Likely answers: servers, racks, cooling, cables, power, internet, security, uptime. Briefly connect student input to the lesson goal.
Datacentre and server room
A datacentre is a space for IT and network equipment
Its main tasks are data processing, storage and transport
A server room has the same main purpose inside a building
Datacentres are usually built for higher scale, control and resilience
Stress that both spaces host IT equipment, but a datacentre is typically more specialised, larger and designed for stronger continuity measures.
Rows, racks and footprint
Rows are lines of racks in the room
A rack is the open frame for IT equipment
The footprint is the rack position in the room
Clear layout helps installation and maintenance
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19 inch and rack units
19 inch is the standard equipment width in a datacentre
Rack Units are written as RU or U
They describe the vertical height of equipment in the rack
This standard makes planning and mounting much easier
Students do not need exact dimensions here; the key point is that width and height are standardised for compatibility.
Suite, cage and access
A suite or cage is a separated area inside a datacentre
It gives a customer a controlled, dedicated space
Physical separation supports security and organisation
Link this to multi-tenant environments where different customers share one building but not the same secured area.
Availability and datacentre design
Tiers classify datacentres by availability level
Redundancy means protection against failure
A carrier-neutral datacentre is not dependent on one network provider
Design choices aim to reduce downtime and improve continuity
Keep this conceptual: tiers indicate expected availability design, while redundancy and carrier neutrality are practical ways to support uptime.
What does a rack unit (U) describe?
Equipment height
Rack width
Room length
Cable speed
Checks the standardisation idea from the slides on 19 inch and rack units. A common confusion is mixing width (19 inch) with height (U).
Complete the datacentre basics
A datacentre is built for IT and network equipment. A server room has a similar purpose inside a building. Equipment is placed in a rack, and its position in the room is the footprint.
All terms come directly from the first subtopic: datacentre/server room, rack, and footprint.
Why is redundancy important in a datacentre?
Expected elements: higher availability, redundancy, carrier-neutral design, reduced downtime, better continuity, more control and resilience than a basic server room.
Power path in a datacentre
IT equipment needs a continuous power supply
Normal mains power is the starting point
Backup systems take over if the normal supply fails
Power design is built around continuity and safe switching
This slide sets up the next slides on UPS, generator, feeds and rack-level power hardware.
UPS and generator
Power failure → UPS supplies the first minutes → generator takes over for longer supply
UPS uses batteries
The generator is engine-driven, often diesel
Emphasise timing: the UPS bridges the gap until the generator is ready. It is not meant to run the whole site for long.
A-feed, B-feed and redundancy
A powerfeed is a power supply path
With redundancy, the two paths are called A-feed and B-feed
If one path fails, the other can keep equipment running
Redundant feeds reduce the risk of outage
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PDU, PSU and ATS
A PSU powers a server or network device
A PDU distributes power inside the 19-inch rack
An Automatic Transfer Switch can switch between two power sources
Make the distinction clear: PSU is inside or part of the device; PDU is rack distribution; ATS manages source switching.
Power plugs and connections
Schuko and C13 are common power connector types
The correct connector must match the equipment and power design
Good cabling reduces risk during installation and maintenance
Students may recognise C13 from server power leads. Keep it practical: connector type matters for safe and compatible connection.
Cooling and efficiency
Warm and cold aisles separate hot and cold airflow
Chillers are part of the cooling system
PUE shows how much energy goes to IT compared with supporting systems
Lower wasted energy means better efficiency
Do not over-explain the formula. The key point is that PUE relates total facility energy to IT energy use.
What happens first during a power failure?
PDU starts power
Generator starts
UPS supplies power
PSU switches rack
Tests the sequence UPS first, generator after. Distractors use nearby terms students may confuse.
Complete the power chain
If normal power fails, the UPS supplies the first minutes. After that, the generator takes over for longer supply. In the rack, a PDU distributes power, while a PSU powers the device itself.
Focus on role differences: UPS and generator in the facility path, PDU in the rack, PSU in the device.
Which power term is easiest to confuse so far?
UPS / generator
PDU / PSU
A-feed / B-feed
Schuko / C13
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Network connections in the rack
Network connections move data from A to B
In a rack, equipment is linked with structured cabling
Copper and fibre are both used in datacentres
Cable choice depends on speed, distance and design
This is the transition into copper, fibre and switching layers.
Copper network connections
CAT5e and CAT6(A) are copper cable categories
Copper is common for short network links
A patch cable is the ready-made cable used to connect devices
Copper cabling must be labelled and managed clearly
Stay general rather than giving unsupported speed tables. The input only commits to copper categories and their role as network links.
Fibre connections
Fibre carries data using light
It is typically plastic in this lesson context
The light source is an LED or a laser
Fibre is often used where high performance or longer links are needed
If needed, mention that in professional settings fibre may also be glass, but keep the slide aligned with the given source text.
LC/UPC and patching
LC/UPC is a connector used on fibre
It is connected to the fibre cable end
Correct connectors are essential for reliable links
Keep this focused on identification and use, not on detailed polishing standards.
Keystones, LSA and patch panels
A keystone is a small coupling block in a patch panel
LSA means solder-free, screw-free and no insulation removal
These components help terminate and organise copper cabling
Clear patching supports faster maintenance
Useful distinction: patch cables connect equipment, while keystones and LSA are part of fixed structured cabling and termination.
CID and cable management
A CID is the identifier of a network cable
It helps technicians find the correct link quickly
Cable management keeps cables ordered, supported and traceable
Good management lowers the chance of mistakes
Relate this to troubleshooting: without labels and routing discipline, even simple work becomes slow and risky.
Topology and network layers
Topology is the overview of a network
It shows how devices and links are connected
The OSI model describes networking in layers
Layered thinking helps technicians separate functions and faults
The lesson need not list all OSI layers. The key idea is that networks are understood through layered design.
Top of Rack and access switches
ToR means Top of Rack
Access switches are the switches in a rack
They connect local servers and devices first
They are the nearest switching layer to the equipment
Use the teacher's wording: ToR/access switches are in the rack. Their role is local device connection.
Distribution and core
ToR / access switches → distribution switches → core switches or core routers
Distribution links racks upward
Core connects the distribution layer to the outside world
This causal-style path is useful because the relationship between layers is the main teaching point.
VLANs and separated traffic
A VLAN is a virtual separated network
Separation can improve organisation and security
Different traffic types can stay apart on the same physical infrastructure
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Office links and carriers
A VPN or dedicated connection links equipment to an office
A carrier supplies network connections
An internet exchange is where providers exchange traffic
A meet-me-room is the datacentre connection hub
Show the difference between a service provider (carrier) and a connection point (internet exchange or meet-me-room).
Which connector is used on fibre?
Schuko
LC/UPC
C13
LSA
LC/UPC belongs to fibre. The distractors are realistic because they are all cable-related terms from nearby slides.
Complete the network path
In a rack, CAT6(A) can be used for copper links, while fibre carries data with light. A CID helps identify the correct cable, and topology shows how devices and links are connected.
Uses taught terms from copper, fibre, cable management and network overview slides.
Which layer connects distribution to the outside world?
Core
Access
ToR
VLAN
Checks the switching hierarchy: ToR/access → distribution → core.
Mounting equipment in racks
Equipment is fixed using rails, brackets or a shelf
The uprights are the vertical strips in the rack
Good rack design supports weight, airflow and access
Mounting must match the device and the available space
Use practical examples: heavy servers often use rails; smaller devices may use a shelf; all rely on the rack uprights.
Rack design
Rack design combines space, power, cooling and cabling
Equipment placement affects serviceability
A clear design reduces installation errors and future rework
Tie together earlier ideas: U space, airflow, A/B power feeds, patching and cable routes all belong in rack design.
Migration
A migration is moving an existing situation
In this context, equipment is moved into a datacentre
Migration needs planning for power, network, rack space and timing
Poor migration planning increases risk of outage
This is a good moment to connect technical design to operational planning.
Procedures and safe working
Procedures describe how work must be carried out
Safe working is essential in technical spaces
Clear steps reduce mistakes during installation and maintenance
Consistent procedures support quality and safety
Keep safety broad and professional: correct steps, controlled work, traceability and reduced risk.
PDCA and controlled improvement
PDCA stands for Plan, Do, Check, Act
It is a cycle for organised work and improvement
In datacentre operations, changes should be prepared, checked and improved
The cycle helps teams work in a controlled way
If students know maintenance or quality systems from other modules, connect PDCA to repeated operational improvement.
Maintenance and outages
A maintenance window is a planned time block for work
An outage is an interruption or failure
Planned maintenance aims to reduce unplanned downtime
Useful distinction: a maintenance window is planned and controlled; an outage is the unwanted interruption.
Service agreements and measures
An SLA records support agreements for a service
An SLO records agreed service quality
A KPI is a measurable point included in the SLA
Uptime is the time a device or service works properly
Help students separate the terms: SLA is the contract, SLO is the target level, KPI is the measurement, uptime is one possible result.
Change and support operations
A Request for Change is a change request for the SLA or service
A ticket system records and tracks work
Smart-hands or remote-hands means datacentre engineers perform tasks for the customer
These processes make work traceable and manageable
Give examples of smart-hands from the source text: rebooting a machine, connecting cables or replacing a hard drive.
Security and compliance
Biometric access can use a fingerprint or iris scan
A VOG states whether there are objections to someone doing certain work
AVG is the law protecting personal data
The AP supervises privacy protection
Keep the legal detail light. Students mainly need to know that datacentre work includes physical access control and data protection obligations.
Standards, monitoring and fire safety
ISO and NEN create standards for order and uniformity
DCIM helps monitor and manage the datacentre environment
Argon can be used as a gaseous fire extinguishing agent
Standards and monitoring support safe, reliable operations
You can mention that ISO is also linked to the OSI model already introduced, showing that standards bodies shape technical practice.
What are uprights in a rack?
Cooling aisles
Power feeds
Vertical strips
Patch panels
Directly checks a practical rack-design term students often miss.
Complete the operations terms
A migration moves an existing situation into the datacentre. Work should follow clear procedures, and teams can improve through PDCA. Planned work is done in a maintenance window to reduce risk.
Brings together planning, safety and controlled operations in one short application task.
What should be checked before a migration starts?
Expected elements: planning power and network, checking rack space, using procedures, reducing outage risk, traceability, safety, maintenance windows, serviceability.
What is one thing you learned today about datacentres?
Reflection prompt with no correct answer. Invite brief personal takeaways from the lesson.
Which topic helped you understand datacentre work best?
Reflection prompt with no correct answer. Useful for checking which explanation style worked best for this group.
Which part of this lesson felt hardest to understand?
Reflection prompt with no correct answer. Use answers to identify concepts to revisit, such as power roles, network layers or rack terms.
Glossary
Datacentre - A space designed for IT and network equipment used for data processing, storage and transport.
Server room - A room in a building whose main function is to house and operate IT equipment.
Rack - An open frame used to place IT equipment.
Footprint - The position of a rack in the datacentre or server room.
19 inch - The standard width for equipment in a datacentre.
Rack Unit (U / RU) - The height unit used inside a rack.
Rows - Lines of racks in a datacentre.
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Glossary
Suite / cage - A separated area inside a datacentre.
Tier - A way to classify a datacentre by availability.
Redundancy - Protection against failure by adding backup paths or systems.
UPS - Battery backup that supplies power during the first minutes of a power failure.
Generator - An engine-driven machine that produces electricity during longer outages.
A-feed / B-feed - Two redundant power supply paths.
PDU - A device that distributes power inside a 19-inch rack.
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Glossary
PSU - The power supply of a server or network device.
Automatic Transfer Switch - A power unit that can switch between two power sources.
PUE - A measure showing how much energy is used by IT equipment compared with supporting systems.
CAT5e / CAT6(A) - Categories of copper network cable.
Patch cable - A ready-made cable used to connect devices.
Fibre - A network medium that uses light to carry data.
LC/UPC - A connector used on fibre cables.
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Glossary
Keystone - A small coupling block used in a patch panel.
LSA - A solder-free, screw-free termination method that needs no insulation removal.
CID - The identifier of a network cable.
Topology - An overview of how a network is connected.
OSI model - A layered model for understanding network functions.
ToR / access switch - The switch in a rack that connects local equipment.
Distribution switch - The switch layer between ToR switches and the core.
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Glossary
Core switch / core router - The network layer that connects distribution switches to the outside world.
VLAN - A virtual separated network.
VPN - A network connection method linking equipment with an office environment.
Carrier - A supplier of network connections.
Meet-me-room - A room in the datacentre used as a connection hub.
Internet exchange - A place where multiple internet providers exchange traffic.
Carrier-neutral - Not dependent on a single carrier.
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Glossary
Migration - Moving an existing technical situation into a new environment.
Procedure - A description of how work must be carried out.
PDCA - Plan, Do, Check, Act; a cycle for controlled improvement.
Maintenance window - A planned time block for maintenance work.
Outage - An interruption or failure of a service.
SLA - The contract describing support agreements for a service.
SLO - The agreed quality level for a service.
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Glossary
KPI - A measurable point used to assess a service.
Uptime - The time a device or service works correctly.
Request for Change - A formal request to change an agreed service or arrangement.
Smart-hands / remote-hands - Datacentre engineers performing physical tasks on behalf of a customer.
AVG - The law that determines which personal data must be protected.
AP - The authority that supervises privacy protection.
DCIM - Systems used to monitor and manage datacentre infrastructure.
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