Network outages can occur for several reasons, including damage to fibre cables, faults in network infrastructure, or issues within key network facilities such as Central Offices and distribution points.  The most common cause, however, is accidental fibre cable damage during third-party construction works.  Fibre cables are typically installed underground, and despite safeguards, they may be inadvertently damaged during excavation activities.  

As fibre cables are part of a shared nationwide network, such incidents may affect many users.  We understand that internet disruptions can affect work, learning, communication and daily activities.  NetLink Trust takes network outages seriously and works closely with Internet Service Providers (ISPs) to restore affected services as quickly and safely as possible.

When a network outage occurs, some end-users may experience disruption to their internet services. The extent of the impact depends on the location and severity of the damage.

Outages may be identified through monitoring systems or reported by ISPs, who will notify NetLink Trust. NetLink Trust will investigate the issue and deploy a restoration team to assess the damage and carry out repairs as quickly as possible, working closely with the affected ISPs.

NetLink Trust strives to restore affected connections as quickly as possible. Most outages are typically resolved within 4 to 12 hours, depending on the circumstances. More complex cases may take longer. Restoration time depends on factors such as:

• Extent of damage
• Location and accessibility
• Weather and site conditions
• Coordination with ISPs, who need to validate services after restoration

Please contact your ISP, who is best placed to check your connection and assist you. Your ISP will coordinate with NetLink Trust where necessary.

NetLink Trust provides updates to affected ISPs throughout the restoration process. ISPs will typically share updates with their customers through their own channels. For incidents affecting 250 or more end users, NetLink Trust will also publish updates on its website (www.netlinktrust.com).

Major fibre cable damage incidents are relatively infrequent, considering the scale of ongoing construction activity and the extensive fibre network across Singapore. Over the past three years, there have been approximately 1 to 4 major incidents per year affecting a larger number of end-users (typically more than 500 connections). The frequency of such incidents has moderated over time following stronger regulatory requirements and improved industry practices. Each incident is reviewed carefully to identify lessons learned and further strengthen preventive measures.

There are established procedures and regulatory requirements to minimise risks during construction works. Contractors must:

• Notify NetLink Trust before carrying out earthworks
• Obtain plant maps showing cable locations
• Engage licensed cable detection professionals

Most contractors comply with these requirements. Non-compliance may result in significant penalties, including fines and/or imprisonment.

While safeguards significantly reduce risk, fibre cable damage cannot be completely eliminated due to:

• Widespread and ongoing construction activity
• Dense and complex underground infrastructure
• Occasional non-compliance or unforeseen site conditions

Preventing cable damage is a shared responsibility among contractors, project owners, regulators, and infrastructure owners. NetLink Trust supports prevention by:

• Providing cable location information
• Working with agencies and contractors
• Complying with regulatory requirements

However, as most incidents arise from third-party works, it is not always possible for any single party to fully prevent them.

Yes. Contractors must comply with regulatory requirements under the Telecommunications Act.  Breaches may result in investigation and enforcement action, including prosecution with fines imposed by the courts, or financial penalties administered by IMDA.  In recent years, several contractors have been penalised, with fines in some cases reaching hundreds of thousands of dollars.

The network is designed to be reliable and resilient, with safeguards built into key infrastructure. It operates on a shared architecture, connecting many homes to central facilities. This allows efficient nationwide deployment. Resilience is built into:

• Central facilities with backup power
• Redundant systems for key functions

However, individual premises are typically connected via a single physical fibre path, which may be affected by external damage. The network balances reliability, efficient land use, and affordability.

Users with critical needs (e.g. healthcare, essential services, enterprises) typically require higher levels of resilience. These are addressed through service-level arrangements by ISPs, such as:

• Multiple fibre paths
• Alternative connectivity options
• Service-level agreements

Fibre connectivity is critical, and disruptions are taken seriously. While no physical infrastructure can be entirely risk-free, efforts focus on:

• Minimising incidents through regulation and coordination
• Restoring services quickly
• Continuously improving processes

Over time, these measures have reduced incident frequency and strengthened network resilience.