Fiber SFP(Small Form-Factor Pluggable) and Mini GBIC specification

See below reference, it explain SFP well. http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html   http://www.cisco.com/en/US/products/hw/modules/ps4999/products_tech_note09186a00807a30d6.shtml

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