Computer Networks for Physiotherapy Students: WAN, NAN, MAN and…

Table of Contents

Computer Networks for Physiotherapy Students: WAN, NAN, MAN and Topologies

A computer network connects devices so that they can exchange data and share services. In a physiotherapy service, a network may carry an appointment, a rehabilitation assessment, a radiology image, a tele-rehabilitation video or a research file. This lesson explains the geographic network types requested in the curriculum—WAN, NAN and MAN—and the physical/logical arrangements called topologies.

Why networking matters in rehabilitation

Physiotherapy increasingly depends on electronic records, shared referral systems, imaging, remote follow-up and connected exercise or monitoring devices. A network can improve continuity and access, but a misdirected message, a weak password, an unsegmented device or an outage can threaten confidentiality and patient safety. A physiotherapist is not expected to configure an enterprise router, but should recognise the basic parts, use them safely and report faults clearly.

Learning outcomes

Define a computer network and distinguish a node, link, protocol, client and server.
Explain bandwidth, latency, reliability, availability and why they affect tele-rehabilitation and electronic records.
Describe WAN, NAN and MAN, and compare them with PAN and LAN.
Explain bus, star, ring, mesh, tree, hybrid and point-to-point topologies, including failure points.
Identify common networking devices and their functions.
Apply safe network use, confidentiality and basic troubleshooting in a physiotherapy setting.

1. Foundations of computer networking

A network is two or more connected devices (nodes) that communicate using agreed rules called protocols. A connection may use copper cable, fibre-optic cable, radio/Wi-Fi, cellular service or another transmission medium. Networks can share files, printers, applications, databases, internet access and messages.

Term	Meaning	Physiotherapy example
Node/host	Any connected device with a network identity.	Workstation, tablet, EMR server, printer, access point or approved sensor.
Link/medium	The wired or wireless path carrying signals.	Ethernet cable from a clinic workstation to a switch, or Wi-Fi to an access point.
Protocol	Rules for addressing, formatting, sending and receiving data.	HTTPS protects a web session; TCP/IP moves data between networks.
Packet	A formatted unit into which data is divided for transmission.	A tele-rehabilitation video is carried as many packets and reassembled at the receiving device.
Client	A device or programme requesting a service.	A therapist’s workstation requesting a patient record.
Server	A device or programme providing a service to clients.	An EMR, file, authentication or imaging server.
Address	An identifier used to deliver data to the correct device or service.	An IP address identifies a workstation or network interface; a domain name identifies a service for humans.

1.1 Performance terms

Bandwidth: the capacity of a link, usually expressed as bits per second. More bandwidth can carry more simultaneous video or image traffic, but does not guarantee quality.
Throughput: the data actually delivered after overhead, interference and congestion.
Latency: delay between sending and receiving data. High latency makes interactive tele-rehabilitation feel unresponsive.
Jitter: variation in delay. It can make voice or video uneven.
Packet loss: data that does not arrive or arrives unusable. It may cause a frozen screen or incomplete file transfer.
Reliability/availability: how consistently the service is usable. A clinic needs a documented downtime process for when it is not.
Security: protection against unauthorised viewing, alteration, interruption or destruction of data.

2. Network types by geographic coverage

Geography is a useful teaching classification, but real networks overlap. A hospital LAN may connect to a city MAN, which connects through a provider WAN to a national data centre. The terms describe scale, not the quality or security of a network.

2.1 PAN — personal area network (comparator)

A PAN connects a person’s nearby devices, commonly through Bluetooth or a short-range wireless link. A phone paired with a smartwatch or a portable exercise sensor is a PAN. Keep pairing restricted and do not send identifiable measurements to an unapproved app.

2.2 LAN — local area network (comparator)

A LAN connects devices within a room, clinic, building or campus segment. A physiotherapy department may use a wired or Wi-Fi LAN for workstations, printers, an EMR server and approved tablets. LANs are usually managed by one organisation and have lower latency than a WAN.

2.3 NAN — neighbourhood area network

In many introductory ICT syllabuses, NAN means neighbourhood area network: a network linking several nearby homes, buildings or local facilities across a neighbourhood. It is larger than a LAN but smaller than a MAN. A community rehabilitation hub, outreach posts and a nearby health centre could be connected through a provider-managed NAN or wireless mesh.

Terminology note: Some textbooks use NAN for “near-me area network,” and networking literature may use the acronym for other specialised concepts. In an examination, state the definition your course uses. Here, NAN is used for neighbourhood area network and is positioned between LAN and MAN by geographic coverage.

Benefits: shares local services, supports community referrals and may reduce the cost of linking nearby sites.
Challenges: several buildings share infrastructure; wireless interference, weather, power and third-party maintenance can affect availability.
Clinical control: each facility still needs separate user accounts, access permissions, encryption and an agreed data-sharing policy.

2.4 MAN — metropolitan area network

A MAN links multiple LANs across a town, city or metropolitan region, commonly using high-capacity fibre or point-to-point links. A municipal or university health network connecting a teaching hospital, satellite clinics and a rehabilitation centre is a useful example. A MAN can support central scheduling, shared imaging and inter-facility referrals, but it remains exposed to backbone failure, congestion and governance issues.

2.5 WAN — wide area network

A WAN connects networks over large distances—districts, countries or continents—using carrier fibre, leased lines, cellular, microwave, satellite or the public internet with secure tunnels. A national health information service or a tele-rehabilitation link from Kampala to a rural district may use a WAN.

WANs usually cross several providers and jurisdictions, so latency and reliability vary.
Routers and security gateways select paths between separate networks.
Encryption, strong authentication, access control and audit logs are essential when health data crosses a WAN.
An internet connection is not automatically a secure clinical network; use the organisation’s approved VPN or health platform.

2.6 Comparison table

Type	Approximate scope	Example in physiotherapy	Main concern
PAN	One person and nearby devices	Phone and movement sensor	Pairing, consent and app privacy
LAN	Room, clinic, building or campus segment	Department workstations, printer and EMR access	Local access control, Wi-Fi security and device management
NAN	Neighbourhood or cluster of nearby sites	Community rehabilitation hub and adjacent health posts	Shared infrastructure, provider dependence and governance
MAN	City or metropolitan region	Hospital, university and satellite clinics in one town	Backbone resilience, routing and inter-facility permissions
WAN	District, national or global	National referral, cloud EMR or remote consultation	Latency, outages, multiple carriers and cross-site security

3. Network architecture and devices

Architecture describes how services and users are organised; topology describes how connections are arranged. A network may use a client–server architecture and a star physical topology at the same time.

Device/service	Function	Clinical example
Network interface card (NIC)	Provides a wired or wireless interface and a hardware address.	Allows a workstation or sensor to join the clinic network.
Switch	Connects devices within a LAN and forwards frames to the correct port.	Links treatment-room computers, a printer and a local server.
Router	Connects different networks and selects paths for packets.	Connects a hospital LAN to a district or internet/WAN service.
Wireless access point (AP)	Provides Wi-Fi access to a wired network.	Connects an approved tablet in a rehabilitation gym; guest and clinical networks should be separated.
Modem/ONT	Converts the provider’s transmission signal to a network connection.	Terminates fibre or cellular internet at a clinic.
Firewall	Applies rules to allow, block and log network traffic.	Restricts the EMR server to authorised services and users.
Server/storage	Provides applications, files, databases or authentication.	Stores records, appointment data or de-identified research files.
Repeater/bridge	Extends or joins network segments at the appropriate layer.	Improves a signal in a large building only after an IT assessment.
Gateway	Connects networks or protocols that are not otherwise directly compatible.	Allows an approved system interface to exchange data between scheduling and EMR services.

4. Network topologies

Topology is the physical or logical arrangement of nodes and links. Physical topology shows where cables and devices are placed; logical topology shows how data flows, which may differ from the cable layout. A topology affects cost, performance, scalability, troubleshooting and the effect of a single failure.

4.1 Point-to-point

One device has a direct link to another. It is simple and can be fast and private, but adding many devices creates many separate links. A dedicated link between two buildings or a sensor and its receiver may be point-to-point.

4.2 Bus topology

All devices share one main backbone cable. It uses less cable and was inexpensive for small networks, but a backbone break can disrupt every device, collisions increase as traffic grows and locating a fault is difficult. A bus needs appropriate termination at the ends.

4.3 Star topology

Each device has a separate link to a central switch or hub. It is the common pattern for modern Ethernet LANs.

Strengths: easy to add or isolate a device; one access cable failure normally affects one endpoint; fault finding is straightforward.
Weakness: the central switch, its power or its uplink can become a single point of failure; more cable is required than a bus.
Clinic example: several consultation-room computers connect to a managed switch, which connects to the server and firewall.

4.4 Ring topology

Each device connects to two neighbours to form a closed loop. Data may travel in one direction or both directions in a dual ring. A single break can interrupt a simple ring unless a bypass or dual path exists. Rings can provide predictable traffic but are less common as the visible endpoint arrangement in ordinary clinics.

4.5 Mesh topology

Devices have multiple interconnections. In a full mesh every node has a direct link to every other node; in a partial mesh only important nodes have several paths.

Strengths: redundancy, resilience and alternative routes if one link fails.
Weaknesses: many links increase cost, configuration complexity and maintenance. Wireless mesh also depends on signal quality and power.
Use: critical backbone or wireless coverage where continuity justifies the additional design and monitoring.

4.6 Tree (hierarchical) topology

A tree combines stars in levels: access switches connect upward to distribution and core devices. It scales well for a campus or hospital and makes responsibility clear, but a failure high in the hierarchy can disconnect an entire branch. Redundant uplinks reduce this risk.

4.7 Hybrid topology

A hybrid network combines two or more topologies, such as star access networks connected by a partial-mesh or ring backbone. Most real health facilities are hybrid because different buildings and services have different requirements.

Topology	Advantages	Limitations/failure point	Suitable health-service use
Point-to-point	Simple, dedicated, easy to understand	Does not scale to many nodes; link failure stops the pair	Dedicated building or device link
Bus	Low cable cost; simple small installation	Backbone failure affects all; collisions and difficult diagnosis	Mostly historical/teaching example
Star	Easy expansion and isolation; one endpoint link failure is local	Central switch/power/uplink failure affects many	Clinic LAN and computer laboratory
Ring	Predictable circulation; dual ring can be resilient	Break or failed node can interrupt a simple ring	Specialised backbone or provider design
Mesh	Multiple paths and high resilience	Costly, complex and needs careful management	Critical links or resilient wireless coverage
Tree	Scalable, hierarchical and manageable	Upper-level failure disconnects a branch	Hospital/campus network with access and core layers
Hybrid	Flexible; matches different buildings and services	More complex to document and troubleshoot	Most multi-building health networks

5. Networks in physiotherapy practice

Electronic records: a workstation requests the correct patient record from a server. Confirm identity before opening or saving.
Referral and multidisciplinary communication: physiotherapy, nursing and medical teams share authorised information. Use the minimum necessary data.
Imaging and PACS: large radiology or movement files require adequate bandwidth and permissions; do not copy images to personal devices.
Tele-rehabilitation: a WAN or internet link carries video and exercise instructions. Confirm patient consent, identity, privacy and a plan for dropped connections.
Community and outreach services: a NAN or MAN may connect distant clinics. Use offline forms and later reconciliation when connectivity is unreliable.
Remote monitoring and wearables: sensors may use a PAN to a phone and then a LAN/WAN to a service. Check device calibration, battery, patient consent and data provenance.
Teaching and research: share de-identified datasets and approved learning resources. Separate research access from the live clinical record.

Scenario: a tele-rehabilitation session freezes

The video freezes while a patient is attempting a balance exercise. Pause the activity and ensure the patient is safe; do not ask the patient to continue without supervision. Check whether only the video is affected, confirm the local device and Wi-Fi status, reconnect through the approved platform and use the agreed telephone fallback. Document the interruption and any clinical consequence. Escalate repeated packet loss or latency to ICT rather than bypassing the organisation’s security controls.

6. Network security and responsible use

Use named accounts, strong passwords and multi-factor authentication where provided; never share credentials.
Connect clinical devices only to the approved clinical SSID/VLAN. Do not use an open café or guest network for identifiable records.
Check the recipient and attachment before sending; use encryption or the approved secure exchange for health information.
Lock screens, position displays away from visitors and remove printed output from shared printers.
Keep routers, access points, computers and connected sensors patched by authorised ICT staff.
Do not install an unknown app, plug in an unknown USB device, disable a firewall or create an unauthorised hotspot.
Use network segmentation so guest, administrative, clinical, medical-device and research traffic are not unnecessarily mixed.
Back up important records and test restoration. A cloud icon or a server does not guarantee that a recoverable backup exists.
Report lost devices, suspicious pop-ups, accidental disclosure, unusual login alerts and service outages promptly. Do not conceal an incident or erase logs.
Use accessible, equitable alternatives when patients lack a smartphone, data bundle, stable electricity or digital literacy.

7. Basic troubleshooting for a learner

Protect the patient first: pause a remote exercise or treatment if communication or monitoring is unsafe; use the clinical fallback.
Define the problem: is one device, one application, one room or the whole facility affected? Note the time and error message.
Check simple causes: power, cable, Wi-Fi indicator, airplane mode, selected network, printer status and whether another approved site works.
Re-authenticate safely: sign in again only through the normal screen. Never enter a password into a pop-up or message from an unknown source.
Restart only when safe: save work and follow the downtime procedure; do not repeatedly unplug a server or medical device.
Escalate with useful information: device/location, user, time, service, error, recent change and patient-safety effect. Do not change network configuration without authority.
Document and reconcile: record care delivered during downtime and transfer it into the approved system with the correct date/time when service returns.

8. Practical learning activities

Draw the path from a therapy-room tablet to an EMR server through an access point, switch, router and WAN. Label where authentication and firewall controls apply.
Classify five examples in your institution as PAN, LAN, NAN, MAN or WAN and justify the boundary used.
Use a classroom diagram to mark the single point of failure in a bus, star, ring and tree network; then add one redundancy improvement.
Compare a tele-rehabilitation link with an ordinary text record transfer: which requires more bandwidth, which is more sensitive to latency, and what fallback is needed?
Practise reporting a network incident without including unnecessary patient identifiers.

9. Examination points and revision questions

High-yield points

WAN connects networks over large geographic areas; MAN covers a city/metropolitan area; NAN is used here for a neighbourhood or cluster of nearby sites.
LAN is a comparator for a building or campus; a real hospital may contain several LANs linked by a MAN/WAN.
Topology is physical and/or logical arrangement; star is easy to manage but depends on the central device.
Mesh adds paths and resilience but increases cost and complexity; tree is hierarchical; hybrid combines designs.
Bandwidth is capacity; latency is delay; packet loss and jitter affect live video.
Network availability and confidentiality are clinical-safety responsibilities, not merely ICT concerns.

Define a computer network and explain five terms used in network communication.
Differentiate PAN, LAN, NAN, MAN and WAN using physiotherapy examples.
Compare star and mesh topologies in terms of cost, scalability, fault tolerance and troubleshooting.
Explain why a tele-rehabilitation service may be affected by latency even when the measured bandwidth is high.
Describe the function of a switch, router, access point, firewall and server.
Describe a safe response when the clinical network fails during a patient session.
Explain four network-security practices that protect confidential patient information.

References for further study

Educational note: Follow your institution’s ICT, privacy, information-governance, telehealth and downtime policies. Network terminology and local procedures may vary; state the definition used by your course or examination board.