The vocabulary you need before a vendor call
Every term here is one you'll actually hear in an RFP, a site tour, or a commissioning report — not textbook trivia. Search or filter by category.
Run your own numbers
Pre-filled with realistic example figures — edit any field and every readout updates instantly.
PUE & DCiE
Power Usage Effectiveness — how much overhead your cooling and power chain adds on top of IT load.
PUE
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DCiE (1/PUE): — — the share of total power actually reaching your servers.
Rack Capacity & Cooling Fit
How many racks a critical-power budget supports, and which cooling technology matches the density.
MAX RACKS
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Quick Colo Cost Estimate
A simplified all-in monthly estimate. For side-by-side vendor comparison and NRC tracking, see the full TCO Calculator in the Buyer's Toolkit.
EST. MONTHLY TOTAL
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Annual: —
Cost of Downtime by Tier
What Tier III vs. Tier IV's expected annual downtime actually costs at your business's downtime rate.
The daily toolbox
A working SSH client can't run in a browser tab — that needs a raw network connection browsers don't allow. These are the calculators and references that don't have that limitation, built to run right here.
Power & Electrical
3-Phase / 1-Phase Power
Convert volts & amps into kVA and kW on the spot — the calculation behind every panel schedule and load study.
APPARENT POWER
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REAL POWER
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UPS Runtime Estimator
How long does the battery bank actually bridge, at this load?
ESTIMATED RUNTIME
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Design-stage estimate only — real runtime also depends on battery age and temperature. Always confirm against the vendor's discharge curve.
Breaker Sizing (NEC 80% Rule)
For a continuous load, code requires the breaker sized so the load never exceeds 80% of its rating.
MIN. RATING (LOAD ÷ 0.8)
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NEXT STANDARD BREAKER
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Standard sizes per NEC 240.6(A). Always confirm against local code and the panel's actual available frame sizes.
Network & IP
Subnet / CIDR Calculator
Enter an address and prefix — get the network, broadcast, and usable host range instantly.
Common Ports Reference
The services you'll open a firewall rule for most often — including the building-automation ports facilities teams forget.
Fiber & Cabling
Fiber Loss Budget
Add up real link loss and check it against a transceiver's optical power budget before you trust a "should work" cable run.
TOTAL LINK LOSS
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Transceiver budgets vary by vendor and specific optic — treat this as a directional sanity check, not a substitute for the datasheet.
Max Cable Run Distance
Pick the media and the speed you're actually running — not just the media's headline spec.
MAX DISTANCE
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Global Ops
Data Center Hub World Clock
Live local time across the markets that actually run global capacity.
Shift Handover Overlap Finder
Assumes a 9:00–18:00 business day in each zone — find the real window to schedule a handover call.
The first 15 minutes decide how bad this gets
Pick the scenario you're facing. Each runbook gives you the same shape: what to check first, what not to do, who to call, how to stabilize, and what to log for the postmortem.
Two tracks, same destination: fewer surprises on-site
Pick the track that matches where you're starting from. Checking off a stop saves your place — come back tomorrow and pick up where you left off.
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Your desk for today
A new Daily Pulse — a stat, a trend, a tip, or a piece of glossary — shared by every reader today. Plus your own tasks, streak, and reminders. This is the tab worth bookmarking.
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day streak
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completed today
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due today
Overdue
Due today
Upcoming
No date / someday
Completed today
Industry Radar
Six numbers worth knowing before your next capacity conversation, pulled from 2026 industry research rather than vendor marketing.
~1,050 TWh
Projected 2026 global data center power use
IEA projection, driven largely by AI/GPU workload growth — cited in DatacenterDynamics' 2026 trends roundup.
50 GW
Projected US data center demand by 2030
Power access, not floor space, remains the top constraint on new capacity.
15% → 40%
AI's share of total DC workloads, 2026 vs. 2030 (projected)
Most existing facilities were designed around pre-AI workload profiles.
~19%
Current liquid cooling adoption
Rising fast — direct-to-chip and immersion cut cooling-related power by an estimated 50–60% in tests.
33%, up from 11%
Operators exploring nuclear/SMR power
Up from 11% three years ago — still mostly exploratory, not operating capacity.
80%
Reporting some cloud repatriation
Workloads moving back from public cloud to owned/colo infrastructure at steady-state scale — a second demand driver alongside AI.
What this means for your day job: most colo capacity marketed as "available" was built around a 15–16 kW/rack average — not the 30–70+ kW/rack an AI deployment needs. When a quote says power is available, ask for the density it's rated at, not just the total kW. And treat any SMR-powered timeline with real skepticism: interest has tripled, but very few reactors are commercially operating today. New glossary terms for all of this — SMR, digital twin, CUE, WUE, AI rack density gap, cloud repatriation — are in the Glossary tab under "Emerging."
Sources: DatacenterDynamics — "Data centers: the ten main trends for 2026" ·
Data Center World — "2026 Data Center Trends: AI, Cooling & Power Insights".
Figures are directional industry projections, not techinfrahub.com's own research — confirm current numbers before citing them externally.
Field Notes
General issues that helped someone else, daily best practices, parts and vendors worth trusting, and what the job actually looks like day to day.
How this works: a live public posting board can't run inside this page — Claude's shared-data tools only work for people signed into the page owner's own account, not the general public. So this is curated: the notes below are starter examples written to seed each section. Use the form at the bottom to send in a real one — it opens an email, and approved notes get added in a future update, credited however you like.
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