BUZZ-Sierra Wireless Inc: Q4 profit, revenue miss
** Canadian wireless equipment maker's U.S.-listed shares down 20 pct at $11.80 after market
** Sierra reports lower-than-expected Q4 earnings and revenue, hurt by fall in demand from its original equipment manufacturer (OEM) customers
** Some OEM customers turn cautious on spending due to uncertain macroeconomic environment, CEO Jason Cohenour says
** Sierra posts Q4 revenue of $144.8 mln, below average analyst estimate of $149.4 mln; profit of 8 cents per share also below analysts' expectations of 10 cents
** Up to Thursday's close, stock had fallen about 7 pct this year
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