BUZZ-DragonWave Inc: Rating upgrade on sales growth potential
** Canadian telecom network equipment maker's U.S.-listed shares shares rise 11 pct to $2.20, highest since mid-September
** HC Wainwright & Co upgrades the stock to "buy" from "neutral"
** Analysts say company's sales growth could top the forecast 60 pct sequential rise as they see "multiple revenue sources come alive"
** HC Wainwright joins CIBC in rating the stock "buy". Three brokerages have "hold" rating, two have a "sell" or lower rating
** First-quarter results expected to on July 9 (firstname.lastname@example.org)
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