---
title: "Tier III equivalent (data) — Class A Atlas glossary"
description: "99.982% uptime data infrastructure target."
canonical: https://classa.info/glossary/tier-iii-data
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> 99.982% uptime data infrastructure target.

## TL;DR

- 99.982% uptime data infrastructure target.
- Borrowed from Uptime Institute data-centre tiering.

# Tier III equivalent (data)

*MEP · Global*

## Short definition

99.982% uptime data infrastructure target.

## Full definition

Borrowed from Uptime Institute data-centre tiering. Many tenant fit-outs (especially for finance, AI, and platform tech) target Tier III equivalent for in-floor IDFs/MDFs: dual-fed power, N+1 cooling, dual fibre paths.

## Why this matters for Class A leasing

Tier III equivalent (data) is part of the mep vocabulary that institutional [Class A](/glossary/class-a) occupiers, landlords, and advisers use across Global markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks regional variation alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

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Citation: Source: Class A Atlas (https://classa.info/glossary/tier-iii-data), updated 2026-04-01T00:00:00.000Z.