** Shares of telecommunications equipment maker WSTL.O
tumble 16.5 pct at $2.89; set to open at more than a 7-month low
** Stock one of the biggest pct losers among Nasdaq-listed
companies in premarket trading on Thursday
** Co, on Wednesday, posted smaller-than-expected Q4 profit
and revenue, impacted by lower sales of commercial repeaters and
DAS conditioners in its in-building wireless segment
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** Misses EPS estimate for the first time in past 4 quarters
and revenue estimate for the 5th time in past 8 quarters
** Up to Wednesday's close, stock had fallen nearly 8 pct
this year, compared with a 2 pct decline in the S&P 500
Electronic Equipment, Instruments & Components sub index
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(Reporting by Vibhuti Sharma in Bengaluru)
((RM: vibhuti.sharma.thomsonreuters.com@reuters.net))