Comcast recovers from outage of video, broadband services across parts of U.S.Comcast, the nation's largest broadband provider and one of the largest pay-TV providers, had a nationwide outage of some services Friday
The Philadelphia-based company said it was aware Friday afternoon some of its TV, broadband and telephone customers across the U
S.were affected.The apparent cause? A pair of cuts in vital fiber at its network partners
"We identified two, separate and unrelated fiber cuts to our network backbone providers," Comcast said in a statement provided to USA TODAY just before 5 p
m.ET."Our engineers worked to address the issue immediately and services are now being restored to business and residential internet, video and voice customers
We again apologize to anyone who was impacted."Initially, Comcast had said a single "fiber cut" had been affecting its customers, as well as other providers
Customers in Philadelpha, Baltimore and elsewhere on the east coast reported outages of Internet and video service on Twitter and on Internet monitoring site Downdetector
com, where outage reports began arriving just after 12:30 p.m.ET.Other reports of outages from Comcast customers were from Seattle, San Francisco and Atlanta, according to Downdetector
com.CNBC, a network within Comcast-owned NBC Universal, first reported the outage
Comcast is one of the nation's largest pay-TV providers with more than 22 million subscribers, and the largest broadband provider with more than 26 million subscribers, according to Leichtman Research Group
The company also provides broadband and video to more than 2 million businesses.San Francisco-based Network monitoring and intelligence firm ThousandEyes began seeing network issues across the Net beginning about 12:15 p
m.ET.By about 4:30 p.m.ET, network issues were appearing to be resolved, the firm said
Many internet users beyond Comcast's own 25 million subscriber base were affected, too, according to ThousandEyes
That's because other traffic travels across the provider's network, because it serves as part of the backbone connecting various regions of the nation
"This is a really good illustration of how interconnected a lot of these networks are," said Angelique Medina, senior product marketing manager at ThousandEyes
"It is kind of like a domino effect.Any one provider can potentially have a big impact on a number of users," she said
"In this case, because it was Comcast, the blast radius was just massive."Follow USA TODAY reporter Mike Snider on Twitter: @MikeSnider
said Friday that the hours-long interruption of its internet, video and voice services, was caused two separate and unrelated fiber cuts to the company's large network providers
The company is working to restore services."We identified two, separate and unrelated fiber cuts to our network backbone providers
Our engineers worked to address the issue immediately and services are now being restored to business and residential internet, video and voice customers
We again apologize to anyone who was impacted.".The company did not specify which providers were impacted
A source told CNBC that one of the cuts occurred in CenturyLink's network.CenturyLink said its network is operating normally, but said there were fiber cuts in its network Friday
"While the CenturyLink network continues to operate normally, on June 29, we experienced two isolated fiber cuts in North Carolina affecting some customers that by themselves did not cause the issues experienced by other providers
At this time, our technicians are working to restore the services," the company said in a statement
Comcast reported last quarter it serves 29.6 million total business and residential customers
It is the second largest U.S. pay TV provider, behind AT&T, since its DirecTV acquisition,
FRIDAY'S MASSIVE COMCAST OUTAGE SHOWS HOW FRAGILE THE INTERNET IS.WIDESPREAD INTERNET OUTAGES around the United States on Friday afternoon quelled productivity and sent irate customers to Twitter to complain
Comcast and Xfinity suffered the biggest service interruptions across its internet, cable, and landline products
The company, which has more than 29 million business and individual customers, said on Friday that the outages stemmed from fiber optic cables at two internet infrastructure companies that were cut or otherwise disrupted
Like virtually all internet providers, Comcast relies on a combination of its own fiber optic infrastructure and that of other partner companies to seamlessly route data around the world
"We identified two, separate and unrelated fiber cuts to our network backbone providers," Comcast said in a statement to WIRED
"Our engineers worked to address the issue immediately and services are now being restored to business and residential internet, video and voice customers
".Comcast says the two internet infrastructure companies involved are Level 3 (now owned by CenturyLink) and Zayo, a fiber company headquartered in Colorado
Throughout the afternoon, the outage-tracking site Down Detector showed service interruptions at CenturyLink, Zayo, and Comcast, but the latter suffered the most severe consequences
"While the CenturyLink network continues to operate normally, on June 29 we experienced two isolated fiber cuts in North Carolina affecting some customers," CenturyLink said in a statement
"At this time, our technicians are working to restore the services.".CenturyLink noted that its two fiber cuts would not have been enough on their own to cause the outage, indicating that another also occurred, as Comcast said
"Earlier today, Zayo experienced a fiber cut in the New York area," said a Zayo spokesperson in a statement
"We immediately dispatched our local team who quickly restored the cut. All impacted services in the area have been restored
".Fiber cuts aren't necessarily malicious, and can happen as the result of incidents like severe weather or construction mistakes
They're also not terribly uncommon; when they do happen, the internet infrastructure community works to implement redundancies and traffic rerouting tactics so physical disruptions don't cause digital ones
In this case, the combination of disruptions in New York and North Carolina were enough to turn off the internet for millions of people
The underlying physical backbone of the internet is surprisingly fragile, and failsafes don't always work
For example, in November, a tiny misconfiguration error at Level 3 caused outages around the US
And a digital attack on the internet infrastructure company Dyn famously caused major outages in 2016 because they were targeted at destabilizing one of the internet's underlying routing protocols
"We are profoundly and globally dependent on a fundamentally fragile infrastructure," says Roland Dobbins, a principal engineer at the DDoS and network-security firm Arbor Networks, which monitors global internet operations
"Some redundancies exist, but many times they don't.".By Friday evening, Comcast service had come back for many customers
But the underlying message should resonate: The internet can be more frail than you'd think, and sometimes all it takes to shut it down is a couple of cuts
Comcast had said a single "fiber cut" had been affecting its customers, as well as other providers
Customers in Philadelpha, Baltimore and elsewhere on the east coast reported outages of Internet and video service on Twitter and on Internet monitoring site Downdetector
com, where outage reports began arriving just after 12:30 p.m.ET.Other reports of outages from Comcast customers were from Seattle, San Francisco and Atlanta, according to Downdetector
com.CNBC, a network within Comcast-owned NBC Universal, first reported the outage
Comcast is one of the nation's largest pay-TV providers with more than 22 million subscribers, and the largest broadband provider with more than 26 million subscribers, according to Leichtman Research Group
The company also provides broadband and video to more than 2 million businesses.San Francisco-based Network monitoring and intelligence firm ThousandEyes began seeing network issues across the Net beginning about 12:15 p
m.ET.By about 4:30 p.m.ET, network issues were appearing to be resolved, the firm said
Many internet users beyond Comcast's own 25 million subscriber base were affected, too, according to ThousandEyes
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