Designing Resilient Networks for Irish Healthcare Facilities

Healthcare networks are categorically different from commercial office networks — and designing them as if they were not is one of the most serious errors an ICT designer can make on an Irish hospital project. The consequences of network failure in a hospital are not a productivity loss or a missed email: they are potentially life-threatening. A clinical network outage can take down PACS imaging, disable ICU patient monitors, silence IP nurse call, and eliminate the electronic medication administration systems that prevent drug errors. This guide provides the complete technical framework for designing resilient, secure, PACS-capable ICT networks for Irish healthcare buildings — from HSE capital hospitals to private clinic fit-outs.

Why Healthcare Networks Are Categorically Different

Four characteristics distinguish healthcare ICT networks from all other building types on Irish projects:

• Life-safety dependency: clinical systems (patient monitoring, infusion pump alarming, nurse call, PACS) depend on the network for patient care functions. Network outage directly impacts patient safety — the network must be designed to availability standards comparable to power supply systems
• Regulatory obligations: Irish healthcare operators are designated as operators of essential services under the EU NIS2 Directive (implemented in Ireland via SI No. 273 of 2024). This mandates documented cybersecurity measures, network incident reporting to the NCSC and periodic network security audits
• GDPR sensitivity: patient health data on the clinical network is special category data under GDPR Article 9. Network design must prevent any possibility of patient data reaching guest Wi-Fi, internet-facing systems or unauthorised devices — network segmentation is a GDPR control measure
• Electromagnetic environment: hospital clinical environments contain medical telemetry systems (patient monitoring wireless), implanted device programmers and sensitive diagnostic equipment. Wi-Fi design must co-exist with these systems — the ICT designer must coordinate with the clinical engineering team and the medical physics department on wireless frequency allocation

Clinical Network Requirements for Irish Hospitals

The following clinical systems each impose specific ICT network requirements on Irish hospital projects:

• PACS (Picture Archiving and Communication System): the imaging network for radiology, CT, MRI, X-ray and ultrasound. PACS requires: 1GbE minimum to clinical workstations viewing DICOM images; 10GbE to imaging suite PACS servers and DICOM storage (large DICOM files — a single CT scan set can be 500MB to 1GB); dedicated VLAN with QoS priority for DICOM traffic; low-latency path to the PACS server
• VoIP (Voice over IP) in clinical areas: IP telephony for nurse-to-nurse and nurse-to-physician communication requires strict QoS — DSCP EF (Expedited Forwarding) marking for voice packets, jitter buffer management, maximum one-way delay under 150ms. Clinical VoIP must be on the clinical VLAN, not the administrative VoIP system
• IP nurse call integration: modern Irish hospital nurse call systems (Rauland, Ascom, Jeron) use IP network integration to route call events to staff assignment boards, nursing station PCs and mobile devices. The nurse call IP integration requires a dedicated VLAN or at minimum QoS priority to ensure call events are delivered within 500ms of activation
• Real-Time Location System (RTLS): asset tracking and patient safety monitoring. Requires dedicated RTLS infrastructure (UWB anchors, BLE beacons or Wi-Fi RTLS tags) connected to the ICT backbone
• BMS/IS 3218 integration: the building management system and IS 3218 fire alarm panel communicate over BACnet/IP — this traffic must be on the Building Automation System (BAS) VLAN, not the clinical VLAN, with appropriate ACL policies preventing cross-VLAN access

HSE ICT Standards for Irish Healthcare Networks

The Health Service Executive publishes the HSE ICT Service Management Framework, which provides guidance on ICT infrastructure standards for HSE capital projects. Key requirements applicable to new hospital builds and major refurbishments in Ireland include:

• Cabling standard: ISO/IEC 11801 Class EA minimum (Cat6A equivalent) for all horizontal copper cabling
• Fibre backbone: OS2 single-mode fibre for inter-building campus connections; OM4 or OS2 for building riser backbone
• Network segmentation: separate VLANs for clinical, administrative, patient-facing, IoMT and building automation traffic as minimum; physical separation (dedicated switches) for clinical VLAN on high-security environments
• Redundancy: no single point of failure in the core network infrastructure serving clinical areas — dual-path fibre backbone, redundant core switches (VRRP/HSRP gateway redundancy), UPS on all network equipment, generator backup for core network
• BIM mandate: ICT infrastructure in Revit at LOD 300 for HSE capital projects above €5m, coordinated with MEP and architectural models in Navisworks

Network Segmentation Design for Irish Hospitals

Inter-VLAN traffic must be controlled by strict ACL (Access Control List) policies on the core switch or dedicated firewall. The clinical VLAN should have zero connectivity to the Guest/Patient Wi-Fi VLAN — this is a hard GDPR requirement, not a recommendation. Any breach of this isolation that results in patient data reaching the public-facing network is a GDPR notifiable incident.

Redundancy Design for Irish Healthcare Networks

Resilience design for an Irish hospital ICT network must address every single point of failure in the network path between clinical devices and their servers:

• Dual-path fibre backbone: the backbone fibre between the MDF and every IDF/TR must follow two physically diverse routes — different cable risers, different cable containment runs, different floors where vertical routing is involved. In the event of one backbone fibre being cut or damaged, the network automatically fails over to the second path
• Ring topology: backbone switches connected in a ring using RSTP (Rapid Spanning Tree Protocol) or MSTP (Multiple Spanning Tree Protocol) — convergence time under 1 second following any single link failure. This is the minimum acceptable convergence time for clinical network resilience in an Irish hospital
• Redundant core switches: two core switches in an MLAG (Multi-chassis Link Aggregation) or VSS (Virtual Switching System) configuration — one can fail without network downtime. VRRP (Virtual Router Redundancy Protocol) or HSRP provides default gateway redundancy for all VLANs
• Dual-NIC critical servers: PACS servers, EMR database servers and clinical application servers should have dual network interface cards, bonded for redundancy using IEEE 802.3ad LACP — a single NIC failure does not cause server network downtime
• UPS on all network equipment: every switch, router, firewall and Wi-Fi controller in the clinical network must be powered from a UPS. UPS runtime must be sufficient to bridge from mains failure to generator start (typically 3–5 minutes for Irish hospital generator start) plus 30 minutes of additional runtime
• Generator backup: confirm with the electrical engineer that all clinical network equipment is on the hospital's essential services generator circuit — network equipment must not share a generator circuit with non-essential loads that could cause voltage fluctuations

Wi-Fi Design for Irish Clinical Environments

Clinical Wi-Fi design in Irish hospitals requires specific considerations beyond standard commercial Wi-Fi planning:

• IEEE 802.11ax (Wi-Fi 6E) for 6GHz spectrum: the 6GHz band (5.925–7.125GHz) is free from legacy device interference and provides large channel widths (up to 320MHz). Clinical environments with legacy medical devices operating in 2.4GHz and 5GHz benefit significantly from Wi-Fi 6E 6GHz as a dedicated clinical device band
• 802.11r Fast BSS Transition: mandatory for clinical environments where medical devices roam between APs. 802.11r reduces re-association time from 50–100ms (standard re-association) to under 20ms — critical for continuous patient monitoring data streams where packet loss during AP roam can cause alarm gaps
• Admission control for critical devices: Wi-Fi controllers (Cisco DNA Center, Aruba Central) should be configured to reserve radio spectrum for critical clinical devices (patient monitors, infusion pump wireless alarms) using U-APSD (Unscheduled Automatic Power Save Delivery) and admission control policies
• RF co-existence with medical telemetry: Irish hospitals using wireless patient telemetry systems (in the 608–614MHz and 1395–1400MHz bands, or MITS-type devices in 450MHz and 900MHz bands) must ensure Wi-Fi deployment does not generate interference in these bands. The ICT designer must provide RF frequency allocation drawings to the clinical engineering team for approval

RTLS for Asset Tracking in Irish Hospitals

Real-Time Location System technology is increasingly adopted in Irish hospitals to address the significant operational cost of locating mobile medical equipment:

• Ultra-Wideband (UWB) RTLS: provides ±30cm accuracy — the highest precision available. Used for critical equipment tracking (ventilators, infusion pumps, portable X-ray) and patient safety monitoring in high-dependency areas. UWB anchors require Cat6A outlets and PoE power; anchor spacing typically 5–8m for ±30cm accuracy
• Wi-Fi RTLS: uses existing Wi-Fi APs as location reference points for tagged devices. Accuracy: room-level (±3–5m). Lower cost than UWB — no additional anchor infrastructure. Suitable for lower-priority asset tracking where room-level accuracy is sufficient. Irish HSE hospitals have trialled Wi-Fi RTLS for wheelchair and equipment trolley tracking
• BLE (Bluetooth Low Energy) beacons: low-cost battery-powered beacons mounted in each room, combined with BLE-enabled staff badges or equipment tags. Room-level accuracy. Lower infrastructure cost than UWB. Battery replacement of beacons is an ongoing maintenance cost

IS 3218 Fire Alarm Network Integration

IS 3218 (the Irish national fire detection and alarm standard, adopted from BS 5839-1) fire alarm systems in Irish hospitals increasingly use IP-based communication for integration with the building management system and ICT infrastructure. Key design requirements:

• The fire alarm control panel (FACP/FACIE) connects to the BMS via BACnet/IP — ICT drawings must show the BACnet/IP network segment, including IP addressing and VLAN assignment (BAS VLAN)
• The ICT designer must coordinate with the fire alarm specialist and BMS engineer to confirm the BACnet/IP integration interface and the specific data points to be communicated (zone alarm status, device fault status, system fault)
• The BACnet/IP network segment carrying IS 3218 fire alarm data must have UPS and generator backup — fire alarm IP communication must not fail during a mains power failure
• IS 3218 fire alarm BACnet/IP traffic must be on a dedicated VLAN (BAS VLAN) with QoS priority to ensure alarm propagation within the required response time regardless of other network traffic

NIS2 Directive and Irish Healthcare Cybersecurity

The EU NIS2 Directive (Network and Information Security Directive 2), implemented in Ireland via SI No. 273 of 2024, designates Irish healthcare operators as operators of essential services — requiring mandatory technical and organisational cybersecurity measures. For ICT network design, this means:

• Network documentation: complete network topology documentation must be maintained — NIS2 requires this as a baseline for incident response and regulatory audit
• Network segmentation: NIS2 requires isolation of clinical systems from public-facing networks — the VLAN segmentation described in this guide is a direct NIS2 technical control
• Incident detection and reporting: Irish healthcare operators must have SIEM (Security Information and Event Management) capability for network security monitoring, and must report significant security incidents to the NCSC (National Cyber Security Centre) within 24 hours of detection
• Zero-trust architecture principles: following the 2021 HSE ransomware attack — which exploited lateral movement across a flat network — HSE cybersecurity guidance mandates zero-trust principles for new hospital network design: microsegmentation, identity-based network access, multi-factor authentication for all administrative access