FCC Issues Staff Report On T-Mobile Outage
The outage was initially caused by an equipment failure and then exacerbated by a network routing misconfiguration that occurred when T-Mobile introduced a new router into its network. In addition, the outage was magnified by a software flaw in T-Mobile¢s network that had been latent for months and interfered with customers¢ ability to initiate or receive voice calls during the outage.
44. While fiber link failures are common, PSHSB finds that these steps, taken together, will reduce the likelihood that a fiber link failure could result in the recurrence of a similar event in TMobile¢s network because traffic would be routed to an alternative path that could handle it. Moreover, if such an event recurred on T-Mobile¢s network, it would not cause such a large service disruption because T-Mobile would have improved its networks¢ ability to manage congestion in the case of a similar event
and would have increased network capacity to maintain the network in a working state even with an increased volume of traffic.