如果你’我一直在想什麼能把一個美國’ 三大移動運營商’ 能夠打電話和發簡訊— 一整天大部分時間都是這樣— T-Mobile現在有了一個部分答案，這與它週一在全國範圍內的大範圍停電有關。

該公司週二晚些時候釋出了一份道歉宣告，你可以在下面完整閱讀，週四，首席技術官內維爾-雷（Neville-Ray）提供了進一步的解釋，你可以在這篇文章的底部找到。

簡而言之，如果我們讀得沒錯的話：一個光纖電路出了故障，它的備用電路也出了故障，這導致了連鎖反應，使網路緊張到許多電話和簡訊無法接通的地步。

較長版本：

June 16th, 2020 6:23pm PST

Update on T-Mobile Voice and Text Performance

Every day we see the vital role technology plays in keeping us connected, and we know T-Mobile customers rely on our network to ensure they have connecti*** with family, loved ones and service providers. This is a resp***ibility my team takes very seriously and is our highest priority. Yesterday, we didn’t meet our own bar for excellence.

Many of our customers experienced a voice and text issue yesterday, specifically with VoLTE (Voice over LTE) calling. My team took immediate action — hundreds of our engineers worked tirelessly alongside vendors and partners throughout the day to resolve the issue starting the minute we were aware of it. Data connecti*** continued to work, as did our non-VoLTE calling for many customers and services like FaceTime, iMessage, Google Meet, Google Duo, Zoom, Skype and others allowed our customers to stay in touch. Additionally, many customers were able to use circuit-switched voice connecti*** and customers on the Sprint network were unaffected. VoLTE and text in all regi*** were fully recovered by 10 p.m. PDT last night. I’m happy to say the network is fully operational… and we’re working day in and day out to keep it that way.

Our engineers worked through the night to understand the root cause of yesterday’s issues, address it and prevent it from happening again. The trigger event is known to be a leased fiber circuit failure from a third party provider in the Southeast. This is something that happens on every mobile network, so we’ve worked with our vendors to build redundancy and resiliency to make sure that these types of circuit failures don’t affect customers. This redundancy failed us and resulted in an overload situation that was then compounded by other factors. This overload resulted in an IP traffic storm that spread from the Southeast to create significant capacity issues across the IMS (IP multimedia Subsystem) core network that supports VoLTE calls.

We have worked with our IMS (IP Multimedia Subsystem) and IP vendors to add permanent additional safeguards to prevent this from happening again and we’re continuing to work on determining the cause of the initial overload failure.

So, I want to personally apologize for any inconvenience that we created yesterday and thank you for your patience as we worked through the situation toward resolution.

Neville Ray

T-Mobile President of Technology

目前尚不清楚哪家第三方提供商的光纖電路出現故障。週一有報道稱，全球主要網際網路骨幹網提供商之一的3級網路正在遭遇斷電，但一位發言人對TechCrunch表示了不同的看法。

上週四，雷在富國銀行（Wells-Fargo）虛擬5G論壇上的一次演講中淡化了中斷，稱T-Mobile只有20%的通話被中斷，因為客戶可以用移動資料來完成其他通話。

“整個事件都是由一個常見的花園光纖中斷引發的，”他說，並補充說，這“暴露了路由問題配置中的一個問題，導致了網路中的一個IP洪水”，而這又“在核心架構中創造了各種容量和保護措施”。

雷說：“在我們弄清楚問題真正存在的地方之後，我們所做的就是在飛行中增加大量的容量。”。

“我們必須做得更好，”雷說，但沒有就T-Mobile未來如何防止此類問題提出任何具體建議。他將這次中斷描述為巧合：“這是一系列事件，從光纖中斷到路由網路，再到核心漏洞，在許多方面，所有這些事情都同時發生，這就是我們看到的中斷。”

“永遠不要說永遠不會，停電永遠是科技公司的一部分，但我們道歉，我們的處境更好。”