Internet and fixed voice services were yesterday restored to users affected by an outage after nearly 30 hours.
The outage was caused by a cut fibre optic cable in Jurong West.
This is the longest outage due to a cable cut - more than twice as long as an incident in Ghim Moh early last year which lasted a record 13 hours.
Fibre operator NetLink Trust said all services were fully restored at 9pm yesterday.
Services were disrupted at 4.30pm on Tuesday in Jurong West, Boon Lay and Corporation Road.
The outage was due to a third-party contractor doing piling works at a worksite in Boon Lay Avenue.
It disrupted Internet access and voice call services for more than 3,500 end users from all three telcos - M1, Singtel and StarHub - and Internet service providers MyRepublic and ViewQwest.
NetLink Trust earlier estimated that services would be restored by yesterday morning.
However, restoration works were hampered by poor site conditions and heavy rain overnight, which slowed down engineers, NetLink Trust said in a statement last night.
This is the first cable-cut incident this year.
The Infocomm Media Development Authority (IMDA) told The Straits Times there were 16 cable-cut incidents last year. Three of them took place between January and March.
In a statement, IMDA said it is concerned about the disruption and that investigations are under way. "IMDA will take action against the relevant parties, including the earthwork contractor, if it is found to have breached any of IMDA's regulatory requirements when carrying out the excavation works."
Under the Telecommunications Act, those found guilty of damaging telecommunications cables while carrying out earthworks can be fined up to $1 million and jailed for up to five years.
Residents affected by the cable cut said the lack of Internet access, which returned progressively to users starting yesterday morning, posed an inconvenience.
Accounts executive Alan Yong, 40, who is pursuing a part-time degree in accounting and finance, said he was not able to finish an assignment on Tuesday due to the outage. "I will have to rush it over the next few days," he said.
•Additional reporting by Priscilla Goy