Verizon says Cablevision's plans to offer 101 Mbps of unlimited Internet access is nothing but a "parlor trick."

Verizon is not too happy with Cablevision's plans to offer 101-megabits-per-second of unlimited Internet access.

Cablevision's promises are nothing but a "parlor trick," Verizon spokesman Eric Rabe wrote in a Thursday blog post.

"With today's technology, you don't have to break much of a sweat to deliver 100 Mbps to a few customers," Rabe wrote. "But given the inherent limits of the cable platform, a cluster of bandwidth junkies living near each other could be a real problem. One estimate is that a single 101 Mbps customer would use some 60 percent of the capacity in a neighborhood. Other users? Outta luck."

Cablevision's Optimum Online Ultra will provided 101 megabits to its entire service area starting May 11 for $99.95 per month.

Verizon has been able to deliver 100 Mbps over its FiOS system for two years, Rabe said. The company's fiber-to-the-home network can deliver 400 Mbps to a single home, and a 50 Mbps service has been up and running for a year, he said.

Rabe acknowledged that "competition is a key innovation driver, so in that sense FiOS along with [Cablevisions'] product and the ultra-high-speed services of others, have the potential to spur the entire industry to breed new ideas at all levels applications, content, information as well as transport," he wrote.

"Time will tell whether [Cablevision] and [high-speed] DOCSIS are up to the task," he continued. "For now, [Cablevison's] leap to 101 Mbps is about market positioning and bragging rights rather than delivering a useful service to a mass customer market."