Spark and Vodafone customers lost broadband around Auckland from around 3pm this afternoon after problems with a Chorus exchange in Glenfield, a Chorus spokesman tells the Herald.
The spokesman said Chorus usual alerts had not displayed, but that the issue had now been resolved.
A 100Gbps link between Mt Eden and Glenfield started experiencing frame-check sequence errors at 2.57 pm, the spokesman said.
"This meant that the link degraded performance but didn't stop routing traffic. As a result the network didn't switch to an alternative route. When this was switched, manually, at 4.30 pm, all services restored."
He added, "The impact is known to be about 15,000 broadband customers and 7000 voice customers across all providers who would have experienced issues during this time window."