The hospital's data center and network core are the brain and spine of the digital building — the rooms where servers, storage, and the core switching/routing fabric live, and the wireless and in-building cellular layer that carries clinical traffic to every bedside, corridor, and stairwell. This Article covers the engineering of the primary technology spaces, the core/distribution network architecture, the enterprise Wi-Fi system, and the distributed antenna system (DAS) for cellular and public-safety radio coverage. It assumes the structured-cabling backbone and telecom-room distribution are designed elsewhere; here the focus is the centralized compute/network spaces and the building-wide RF coverage they enable.

The technology spaces: data center, MDF, and the "core"

Modern hospitals consolidate most compute and the network core into one or two purpose-built rooms, with a hierarchy of distribution spaces fanning out from them.

• Main data center / server room — Houses application and virtualization servers, storage area network (SAN)/network-attached storage (NAS), backup appliances, and the core network and security equipment. In a large hospital this may be an on-premises Tier-equivalent room (informed by the Uptime Institute Tier topology and the ANSI/TIA-942 data-center standard), though many health systems now split the load between a smaller on-prem room for latency-sensitive and life-safety-adjacent systems and a remote/colocation or cloud tier for everything else.
• Main distribution frame (MDF) / main equipment room (ER) — The top of the structured-cabling hierarchy and the home of the network core switches. The MDF and the data center are sometimes the same room and sometimes adjacent; keeping them separate (compute vs. network demarcation) simplifies maintenance and fault isolation.
• Intermediate/horizontal distribution frames (IDF / TR) — Telecommunications rooms on each floor/zone that terminate horizontal cabling and house edge/access switches. Their design (sizing, stacking, riser pathways) is the subject of the sibling Telecom/Equipment Rooms Article; the relevant point here is that the core ties them all together.

Spaces are governed by the FGI Guidelines (which call for dedicated, secured, environmentally controlled technology rooms and increasingly treat IT infrastructure as essential to patient care), TIA-569 (pathways and spaces), and TIA-942 (data-center facilities). Room location is a design decision with real consequences: data centers should be sited away from flood-prone levels and below-grade mechanical risks, away from water/steam mains and wet stacks, out of high-EMI zones, and on the essential electrical system (EES) so they ride through utility loss per NFPA 99 and NFPA 110.

Network architecture: core, distribution, and access

The hospital network is conventionally built as a layered hierarchy so that traffic, faults, and growth are all manageable.

Design considerations that matter most in a healthcare setting:

• Network segmentation. Clinical/biomedical devices, guest Wi-Fi, building-automation and physical-security systems, and corporate/administrative traffic are separated into distinct VLANs/segments — both for performance and to contain the security and HIPAA exposure of connected medical devices. Many systems layer in network access control (NAC) and microsegmentation for the medical-device (IoMT) population.
• Power over Ethernet (PoE). A large and growing share of edge ports deliver PoE/PoE+ to wireless access points, VoIP phones, cameras, and badge readers — driving switch power budgets, heat load in IDFs, and the case for UPS-backed edge switching.
• Bandwidth and uplinks. PACS imaging, EHR, telemetry, real-time video, and clinical mobility push core and uplink capacity; 10/25/40/100 Gb uplinks between access, distribution, and core are now common in new builds, with fiber backbone sized for the building's planned life.
• Out-of-band management. A separate management plane lets engineers reach switches even when the production network is impaired.

Redundancy of the network core, diverse fiber pathways, and resilient power feeding these spaces are the explicit subject of the sibling ICT Redundancy Article; the core here is designed to be made redundant, but the resilience engineering itself lives there.

Data-center environment: power, cooling, and fire protection

A hospital data center is a continuously running, high-density load that must survive both routine maintenance and utility failure.

• Power. Data-center and core-network loads are placed on the essential electrical system (typically the equipment branch under NEC 517 / NFPA 99) so they transfer to generator within the required time on utility loss, and are further protected by uninterruptible power supply (UPS) systems that bridge the generator-start gap and condition power. Dual power feeds to dual-corded equipment, sized UPS runtime, and generator fuel duration are coordinated with the electrical engineer; NEC 517 governs essential-system wiring and NFPA 110 governs the emergency/standby power source.
• Cooling. Precision cooling (CRAC/CRAH units, in-row cooling, or hot/cold-aisle containment) maintains temperature and humidity within equipment limits, with guidance drawn from ASHRAE TC 9.9 thermal classes. Cooling for a true 24/7 data center is itself often placed on essential power and, where it serves life-safety-adjacent systems, treated as a continuous-duty load. (General clinical-space ventilation is governed by ASHRAE 170; the data-center room is an equipment environment, not a patient-care HVAC space.)