如果你’我一直在想什么能把一个美国’ 三大移动运营商’ 能够打电话和发短信— 一整天大部分时间都是这样— T-Mobile现在有了一个部分答案，这与它周一在全国范围内的大范围停电有关。

该公司周二晚些时候发布了一份道歉声明，你可以在下面完整阅读，周四，首席技术官内维尔-雷（Neville-Ray）提供了进一步的解释，你可以在这篇文章的底部找到。

简而言之，如果我们读得没错的话：一个光纤电路出了故障，它的备用电路也出了故障，这导致了连锁反应，使网络紧张到许多电话和短信无法接通的地步。

较长版本：

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纤电路出现故障。周一有报道称，全球主要互联网骨干网提供商之一的3级网络正在遭遇断电，但一位发言人对TechCrunch表示了不同的看法。

上周四，雷在富国银行（Wells-Fargo）虚拟5G论坛上的一次演讲中淡化了中断，称T-Mobile只有20%的通话被中断，因为客户可以用移动数据来完成其他通话。

“整个事件都是由一个常见的花园光纤中断引发的，”他说，并补充说，这“暴露了路由问题配置中的一个问题，导致了网络中的一个IP洪水”，而这又“在核心架构中创造了各种容量和保护措施”。

雷说：“在我们弄清楚问题真正存在的地方之后，我们所做的就是在飞行中增加大量的容量。”。

“我们必须做得更好，”雷说，但没有就T-Mobile未来如何防止此类问题提出任何具体建议。他将这次中断描述为巧合：“这是一系列事件，从光纤中断到路由网络，再到核心漏洞，在许多方面，所有这些事情都同时发生，这就是我们看到的中断。”

“永远不要说永远不会，停电永远是科技公司的一部分，但我们道歉，我们的处境更好。”