If anybody doubted that there’s growing — perhaps unprecedented — competition in the business of providing fiber-optic Internet service to the home, look at what cable giant Comcast announced Thursday.

Comcast said it will offer residential 2Gbps service, known as Gigabit Pro, to more than 1.5 million customers in Atlanta starting in May. Pricing wasn’t announced, but Comcast also disclosed in a blog on its website that it will expand this service to additional areas nationwide, making it available to about 18 million homes by the end of the year.

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