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* Cisco Systems Inc. agreed to buy closely held Clarity Wireless Corp. for about $157 million in stock, acquiring equipment that links computers to the Internet with wireless communications. San Jose-based Cisco said it will take a charge of 6 cents to 9 cents a share in its fiscal second quarter to pay for acquired research and development. Cisco said Belmont-based Clarity’s so-called fixed wireless technology is the first to provide reliable high-speed operation in obstructed environments, meaning it doesn’t require clear line-of-sight paths between communication points. Cisco shares rose $2.94 to close at $96.63 on Nasdaq.