Investing in Cisco Systems can yield $1,000 in annual dividends, but how much do you need to invest? Find out the required number of shares and total cost here.Want some extra cash in your pocket each year, with low risks and no effort? If you're looking to generate$1,000 in dividend income, investing in Cisco Systems (CSCO 0.02%) could be a solid option.Crunching the numbersTo find out how much you need to invest, divide your target income by the yield. With a yield of 3.4%, you'll earn $1000 a year from ...