“This notice triggers a period of 60 calendar days during which LightSquared can remedy the payment before Inmarsat is entitled to enforce its rights and remedies under the agreement for payment default, including pre-agreed spectrum arrangements and termination of certain LightSquared rights under the Cooperation Agreement,” Inmarsat said in the notice.

   The first phase of the companies’ 2007 multi-phase agreement to reallocate spectrum resources required Inmarsat to fulfill certain obligations important to the deployment of LightSquared’s 4G-LTE integrated terrestrial and satellite network and protection of their respective customers. LightSquared responded to with its own statement published Feb. 21, which claimed that the payment had not yet been triggered under the terms of the original agreement.

   “LightSquared has raised several matters that require resolution before the first phase comes to a close,” the 4G LTE network operator said in the company statement. “The terms of the agreement allow for additional time to resolve pending questions before phase one is complete and the final payment is due. LightSquared is committed to fulfilling its business plan to bring world-class wireless broadband connectivity to millions of Americans and believes that Inmarsat will remain an important partner in the company’s future endeavors.”

   The future of LightSquared was placed in serious jeopardy last week when the U.S. Federal Communications Commission (FCC) ruled to withdraw the waiver it granted the company to use its satellite spectrum for terrestrial broadband service while it tried to solve alleged interference issues with GPS receivers. The commission found that there appeared to be no solution to the problem. LightSquared is disputing the FCC findings.

   “LightSquared has raised several matters that require resolution before the first phase comes to a close. The terms of the agreement allow for additional time to resolve pending questions before phase one is complete and the final payment is due,” the network operator said. “LightSquared is committed to fulfilling its business plan to bring world-class wireless broadband connectivity to millions of Americans and believes that Inmarsat will remain an important partner in the company’s future endeavors.”