** Shares of networking equipment maker Ciena CIEN.N fall 5.8% to $69 premarket
** Company reports Q4 adjusted EPS of 54 cents vs analysts' estimate of 66 cents, data compiled by LSEG shows
** Gross profit falls 5.4% over the year earlier
** Q4 revenue down 0.5% at $1.12 bln, compared with estimates of $1.10 bln
** Quarterly revenue from its biggest segment, networking platforms, down 2% due to a decline in routing and switching revenue
** Revenue down in regions excluding Americas
** Up to Wednesday's close, stock up 62.7% YTD
(Reporting by Neil J Kanatt in Bengaluru)
((Neil.JKanatt@thomsonreuters.com))
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