By Marina Lopes NEW YORK (Reuters) – Network equipment maker Cisco Systems Inc posted a lower-than-expected 5.5 percent decline in quarterly revenue, and the companys shares edged lower. Cisco had a net profit of $2.2 billion in the third quarter, down from $2.5 billion in the year-ago quarter. Cisco reported revenue of $11.5 billion, down from $12.2 billion a year earlier. Wall Street on average had expected $11.36 billion, according to Thomson Reuters I/B/E/S. (Reporting by Marina Lopes; Editing by Richard Chang)