Communications Room Design in Australia: AS/NZS 3084 Standards and Best Practice

Every multi-storey residential or commercial building depends on one room that most occupants never see. The communications room — also called the comms room, MDF room, or telecommunications room — is the physical hub where all of a building's network and communications infrastructure converges. Get the design right and the building's technology will serve its occupants reliably for decades. Get it wrong and you will spend years dealing with overheating equipment, failed access control systems, NBN outages, and costly retrofits.

This guide covers what AS/NZS 3084:2017 requires, what a compliant communications room contains, and the design decisions that separate a high-performing building infrastructure from a chronic maintenance problem.

What Is a Communications Room?

A communications room is the dedicated, secure space that houses a building's active and passive telecommunications and network equipment. In a typical apartment building, that includes:

• Patch panels and structured cabling terminations — the passive layer connecting horizontal cabling runs from each tenancy back to the central point
• Network switches and routers — the active layer managing data traffic across the building
• NBN termination equipment — the point where the carrier network hands off to the building's internal infrastructure, whether that is FTTB (Fibre to the Building), FTTP (Fibre to the Premises), or HFC
• NVR/CCTV recorders — video surveillance storage and management
• Access control controllers — the brains behind door readers, intercoms, and lift access restrictions
• Intercom and visitor management systems — typically rack-mounted or wall-mounted in the comms room
• UPS (Uninterruptible Power Supply) — battery backup protecting critical systems during power interruptions
• Emergency and lift phone systems — required under AS 1735 for passenger lifts

Every multi-storey building requires at least one communications room, known as the MDF (Main Distribution Frame) room. In buildings of three or more storeys — or where horizontal cable runs would exceed the maximum 90-metre channel length for Cat 6A copper cabling — each floor or zone also requires an IDF (Intermediate Distribution Frame) room, sometimes called a floor distributor or telecommunications outlet.

For context on how the cabling infrastructure connects to and from this room, see our guide to structured cabling standards for apartment buildings.

The Governing Standard: AS/NZS 3084:2017

The primary Australian standard for communications room design is AS/NZS 3084:2017 — Telecommunications Installations: Telecommunications Pathways and Spaces for Commercial Buildings. Published by Standards Australia and Standards New Zealand, it replaces the 2003 edition and aligns with international frameworks including ISO/IEC 14763-2.

AS/NZS 3084 governs the physical environment — the room dimensions, environmental conditions, power infrastructure, cable pathways, and access requirements that a compliant telecommunications space must meet. It sits alongside:

• AS/NZS 3080:2013 — integrated cabling systems (the cabling itself, rather than the space)
• AS/CA S009:2020 — mandatory customer cabling requirements for connections to carrier networks
• AS/NZS 3000:2018 — wiring rules (relevant for power and earthing within the comms room)

Architects, building designers, and developers should treat AS/NZS 3084 as a core reference from the earliest design stages. Retrofitting a compliant communications room into a completed building is expensive. Allocating the right space at DA stage costs nothing.

For a broader overview of how these standards interact, see our article on AS/NZS standards for building networks.

Room Size and Dimensions

MDF Room (Main Distribution Frame)

The MDF room is the primary telecommunications space in the building. All riser cables, external carrier connections, and inter-floor backbone cabling terminate here. For the equipment to be safely installed, maintained, and replaced, the room must provide genuine working clearance — not just enough space to close the door.

Minimum working clearance requirements under AS/NZS 3084:2017:

• Width: 1,200 mm minimum clear working space in front of equipment racks
• Height: 2,400 mm minimum clear ceiling height
• Depth: sufficient to accommodate rack depth (typically 600 mm) plus front and rear working clearance (minimum 600 mm front, 600 mm rear where rear access is required)

For a standard 10-unit to 30-unit apartment building with a single rack, a dedicated room of approximately 3.0 m x 2.4 m is workable. Buildings with 50 or more apartments, active CCTV systems, access control, and UPS should plan for 4.0 m x 3.0 m or larger.

A practical rule: design for 20% more rack space than your current equipment list requires. Every building's technology footprint grows — security cameras are added, building management systems are integrated, managed Wi-Fi infrastructure is deployed. A comms room that is tight on day one will be a problem within three years.

IDF Rooms (Intermediate Distribution Frame)

IDF rooms serve individual floors or zones, housing the floor-level switches and patch panels that connect horizontal cabling runs to the MDF backbone. In a multi-storey apartment building with three or more storeys, each floor should have a dedicated IDF.

Minimum IDF working clearance:

• Width: 600 mm minimum (typically a lockable wall-mounted cabinet or small dedicated room)
• Height: 2,400 mm where a full-height rack is used; smaller enclosed cabinets must still provide adequate ventilation
• Depth: as per MDF requirements, proportional to the equipment installed

In high-rise buildings, IDF rooms are commonly stacked vertically to align riser penetrations. This simplifies vertical cable management and reduces the length of backbone cabling runs between floors.

Environmental Requirements

Temperature

Operating temperature for active telecommunications and network equipment is typically specified by manufacturers at 18–27°C. This range is consistent with AS/NZS 3084 guidance and aligns with ASHRAE thermal guidelines for network equipment.

In Australian conditions — particularly in Queensland, NSW, Victoria, and Western Australia during summer — ambient building temperatures in plant rooms, basements, and mechanical spaces can exceed 40°C. A sealed room full of active switches, NVRs, and UPS batteries will generate significant heat load regardless of ambient temperature.

The requirement is clear: if the natural ambient temperature in the communications room cannot maintain equipment within its operating range, a dedicated cooling solution is required. A split-system air conditioner sized for the heat load (including a capacity buffer) is the standard solution. Do not rely on passive ventilation or a door left ajar.

Cooling failure is the single most common cause of premature equipment failure in comms rooms across Australia. It is also entirely preventable at the design stage.

Humidity

Relative humidity should be maintained between 45% and 55% (non-condensing). High humidity risks condensation on circuit boards and connectors; low humidity increases the risk of electrostatic discharge. In most Australian climates, a correctly sized split system will manage humidity as a by-product of temperature control.

No Plumbing Through the Room

This is non-negotiable. Water supply pipes, drainage pipes, fire sprinkler mains, and stormwater lines must not pass through or above the communications room. A burst pipe, a slow drip from a leaking joint, or condensation from an uninsulated cold water pipe will destroy rack-mounted equipment and potentially cause a building-wide network failure.

Where architectural constraints make routing around a comms room difficult, the comms room location must be reconsidered at design stage — not accommodated with a drip tray or waterproofing finish.

Fire Suppression

A communications room should not be protected by a standard water-based sprinkler system. Water discharge will destroy active and passive equipment, rendering the building's access control, intercom, security, and communications systems inoperable at the same moment they are most needed — during a building emergency.

The correct solution is a gaseous (clean agent) suppression system — systems using inert gases or chemical agents such as FM-200 (HFC-227ea) or Novec 1230 that suppress fire without leaving residue or conducting electricity. These systems protect the equipment, maintain room integrity, and align with best-practice fire engineering for technology rooms.

Where a full gaseous suppression system is not installed, a fire detection system (smoke detectors connected to the building's fire indicator panel) should at minimum be present to provide early warning.

Power Requirements

Dedicated Circuits

Equipment in the communications room must be served by dedicated electrical circuits — circuits that supply only the comms room and are not shared with lighting, general power outlets, mechanical plant, or any other building load. This is required for safety, load management, and fault isolation.

Sharing a circuit between network equipment and other building loads introduces voltage sag, harmonic distortion, and the risk that a tripped circuit breaker kills the building's access control and security systems without warning.

Minimum Power Points

AS/NZS 3084 and associated electrical standards require a minimum of four general-purpose outlets (GPOs) per rack, all on dedicated circuits. In practice, a well-designed comms room provides:

• Dedicated circuit(s) for UPS-backed critical loads (access control controllers, emergency communications, intercom, lift phones)
• Dedicated circuit(s) for non-UPS equipment (NVR storage, non-critical network infrastructure)
• Sufficient outlet positions to avoid power board cascading, which introduces additional failure points

UPS (Uninterruptible Power Supply)

A UPS is not optional where the communications room houses any critical building systems. The following systems require continuous power to perform their safety and security functions:

• Access control (door strikes, lift restrictions)
• Emergency lift telephone systems (mandated under AS 1735)
• Intercom and visitor management
• Emergency communications equipment

The minimum UPS runtime for critical building systems is typically 4–8 hours, which covers most power interruptions and allows for a controlled shutdown if the outage extends beyond that period. UPS battery sizing must account for the full connected load and the desired runtime, with a capacity buffer for battery degradation over time.

UPS units themselves generate heat and require adequate ventilation or cooling. They must be located in the comms room or an adjacent purpose-built UPS space — not in a general electrical cupboard alongside a switchboard.

Telecommunications Earthing Bar (TEB)

All telecommunications equipment requires a clean, dedicated earth to Australian standard. AS/NZS 3084 requires a Telecommunications Earthing Bar (TEB) to be installed in each communications room, bonded to the main earthing system in accordance with AS/NZS 3000. The TEB provides a single earthing reference point for all rack equipment, reducing earth loops and interference that can degrade network performance and damage equipment.

This is a specific requirement that is frequently overlooked in comms room fitouts completed by electricians unfamiliar with telecommunications standards. Ensure your design documentation explicitly specifies TEB installation.

Cable Management

Horizontal Cable Trays

Horizontal cable runs above ceiling tiles or within the ceiling space should be managed on overhead cable trays within the communications room. Cable trays keep runs organised, allow for future additions without disturbing existing cabling, and provide physical separation between cable types.

Trays must be sized to avoid fill levels above 50% of nominal capacity — a cable tray stuffed to capacity cannot be managed, labelled, or expanded.

Vertical Cable Ladders

Vertical riser runs between MDF and IDF rooms travel through riser shafts or dedicated conduit penetrations between floors. Cable ladders (as opposed to solid-bottom trays) are the standard solution for vertical runs, providing mechanical support for cable weight while maintaining airflow around the cables.

Riser penetrations between floors must be fire-stopped after cabling is installed, using appropriate penetration sealing systems compliant with the National Construction Code.

Separation of Data and Power Cabling

AS/NZS 3000 specifies minimum separation distances between data cabling and mains power cables. In a comms room, copper data cabling should be run on separate trays from power cabling, with the appropriate separation maintained. Fibre optic cabling is immune to electromagnetic interference but should still be managed on separate trays to avoid mechanical damage from heavier copper cable bundles.

Do not co-locate structured cabling with high-voltage cables, UPS output cables, or unshielded power distribution.

Cable Labelling

Every cable — at both ends — must be labelled in accordance with the documentation requirements of AS/NZS 3080. The label must identify the cable's origin, destination, cable type, and an identifier that corresponds to the as-built documentation for the building.

This requirement exists for practical reasons: an unlabelled comms room is a room that cannot be safely maintained, expanded, or handed over to a new technician or building manager. Unlabelled cabling also makes fault isolation — finding why a specific apartment has lost network connectivity — a process that takes hours rather than minutes.

For documentation requirements, see our guide to as-built documentation for building networks.

Security and Access Control

Locked Room with Restricted Access

The communications room must be a lockable, restricted-access space. Access should be limited to:

• The building manager or facilities manager
• Licensed cabler (ACMA-registered) attending for maintenance or installation
• Authorised building systems technicians (security, access control, HVAC, lifts)
• Emergency services personnel

An unsecured comms room is both a physical security risk — network access points inside provide a direct path to the building's internal network — and an operational risk, as unauthorised interference with cabling or equipment can take down building-wide systems.

Door Width

The access door to the MDF room must be a minimum of 900 mm clear width. This is not arbitrary: rack-mounted equipment such as NVR units, UPS batteries, and network switches is physically large and heavy. A standard 820 mm internal door will not allow a 19-inch rack or a large UPS to be replaced without removing the door from its frame. Plan for 900 mm as the minimum; 1,000 mm is preferable in larger rooms.

No Windows

Communications rooms should have no external windows. Windows introduce:

• Temperature variability from solar gain and radiated heat
• A potential forced-entry point for theft of equipment
• Condensation risk from temperature differentials between the room and the exterior

Where an internal window to an adjacent space might be considered (for example, overlooking a building management office), a fire-rated fixed light may be acceptable — but operable windows are not appropriate.

Access Register

All access to the communications room should be logged. This can be as straightforward as a physical key register maintained by the building manager, or — in larger or higher-security buildings — an electronic access control reader on the comms room door itself that records access events to the building management system.

Common Mistakes in Communications Room Design

These are the recurring problems encountered during comms room audits of existing buildings. All of them are easier to prevent during design than to fix after construction.

1. The room is too small to work in safely. A room large enough to close the door around a rack is not a working communications room. Technicians need space to kneel, pull cables, carry equipment, and work without contorting around obstructions. Undersized rooms also limit future expansion — the next system installed means the previous system cannot be safely accessed.

2. No cooling has been planned. In Australian conditions, an unventilated room containing active network and security equipment will overheat. Equipment fails silently: switches reboot, NVRs drop footage, access controllers lock out residents. Cooling must be specified and sized at design stage.

3. The room is shared with building services. Mechanical plant rooms, electrical switchboards, water pump sets, and hot water systems do not belong in the same space as telecommunications equipment. Heat, vibration, water risk, and electrical noise from these systems degrade or damage network equipment. AS/NZS 3084 requires telecommunications spaces to be dedicated.

4. Insufficient power and circuit design. Four outlets on a single shared circuit, with power boards cascading from the rack, is a comms room designed to fail. Dedicated circuits, correctly rated, with sufficient outlet positions for the equipment present and the growth expected — this must be in the electrical drawings from the start.

5. No documentation of what is installed or how it connects. A comms room without as-built drawings, cable schedules, and equipment registers is a liability. When the building is sold, when a new building manager takes over, or when a fault needs to be isolated, the absence of documentation turns routine maintenance into a forensic investigation.

Planning for Future Capacity

Buildings constructed today will be maintained and operated for 30 to 50 years. The technology that will run across the communications infrastructure 15 years from now does not yet exist in its final form. Designing for current requirements only is a false economy.

The decisions made during construction that are cheapest to get right and most expensive to retrofit:

Conduit and pathways. Over-provision conduit during construction. Adding conduit after concrete slabs and finished walls are in place requires core drilling, fire stopping, and make-good — costs that are ten times or more the original conduit cost. Spare conduit costs almost nothing during construction.

Rack space. Leave at least 4–6U of free rack space in the MDF and each IDF at practical completion. This accommodates the first system additions without requiring a new rack or a new room.

Fibre backbone. Run a fibre optic backbone between MDF and each IDF regardless of whether active fibre equipment is being installed at the time of construction. Copper backbone cabling has a practical ceiling; fibre does not. Future FTTP upgrades, high-density managed Wi-Fi systems, and building management system integrations all benefit from a fibre backbone.

Power capacity. Size the sub-board feeding the communications room for 150% of the current load. Additional circuits are cheap to add to a correctly sized sub-board; upgrading a sub-board that has no spare capacity is not.

For a full view of the infrastructure requirements relevant to new apartment developments, see our guide to technology infrastructure for new developments and our developer-focused overview of NBN MDF requirements.

MDF Room Design Checklist

Use this checklist as a reference during design review, construction inspection, or pre-handover audit.

Frequently Asked Questions

Q: Does every apartment building in Australia need a dedicated communications room?

A: Any multi-storey apartment building — or any building where the telecommunications and network infrastructure requires rack-mounted equipment, UPS, and building systems controllers — should have a dedicated communications room. AS/NZS 3084:2017 applies to commercial buildings, and its requirements for telecommunications pathways and spaces reflect the practical reality that shared or ad-hoc spaces create maintenance, safety, and reliability problems. Even small residential developments benefit from a purpose-designed, lockable telecommunications space rather than a cupboard shared with the hot water system.

Q: What is the difference between an MDF room and an IDF room?

A: The MDF (Main Distribution Frame) room is the primary telecommunications space in the building — the point where external carrier connections (NBN, fibre) terminate, where the building backbone converges, and where the central active equipment (core switch, UPS, head-end security systems) is housed. The IDF (Intermediate Distribution Frame) room — also called a floor distributor — is a secondary telecommunications space on an individual floor or zone, housing the floor-level switch and patch panel that connects horizontal cabling from each tenancy back to the MDF via the vertical backbone. In buildings of three or more storeys, IDFs are needed to keep horizontal cable runs within the 90-metre maximum channel length for structured copper cabling.

Q: Can the communications room share space with the electrical switchboard?

A: No. AS/NZS 3084 requires telecommunications spaces to be dedicated. Sharing a room with high-voltage switchboards introduces electromagnetic interference, heat, noise, and a safety risk — electrical work requires the space to be treated as an electrical hazard area, which conflicts with telecommunications maintenance requirements. Electrical switchboards and telecommunications rooms should be in separate, adjacent spaces where possible.

Q: What happens if the comms room overheats?

A: Active network equipment — switches, routers, NVR recorders, access control controllers — has a defined operating temperature range. Above that range, devices begin to throttle performance, reboot unexpectedly, or fail permanently. In an apartment building, an overheating comms room can result in simultaneous failure of internet connectivity, building access control, intercom, CCTV, and emergency systems. Equipment failures from thermal stress are often not covered by manufacturer warranties if the operating environment was outside specification. Cooling is not an optional upgrade — it is a design requirement.

Q: Who is responsible for ensuring a new apartment building's communications room meets AS/NZS 3084?

A: The developer, architect, and ICT/communications consultant engaged during the design phase share responsibility for ensuring the building's telecommunications spaces are designed to standard. A licensed cabler (ACMA-registered) is required for the installation of telecommunications cabling and equipment. Building certifiers may review drawings for compliance with the National Construction Code, but AS/NZS 3084 compliance requires specialist telecommunications design input — it is not automatically covered by standard building or electrical inspections. Engaging a specialist at design stage, rather than during construction or at handover, is consistently the more cost-effective approach.

Pickle Designs and Fits Out Compliant Communications Rooms

Pickle works with property developers, architects, builders, and building managers across Australia to design and install communications rooms that meet AS/NZS 3084:2017 from the ground up. Whether you are designing a new apartment development, upgrading an existing building's comms room, or conducting a pre-sale infrastructure audit, the team at Pickle brings the technical expertise and practical experience to get it right.

Pickle's scope covers design consultation, equipment specification, structured cabling, rack fitout, UPS installation, CCTV and access control integration, NBN termination, and full as-built documentation — so your building's communications room is compliant, maintainable, and ready for whatever technology the next decade brings.

Call 1300 688 588 or email [email protected] to discuss your project.