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3Com SuperStack 4 Switch , Model 5500-EI.Came form the local school surplus facility. It does power up, however I did not do any further testing. STOCK PICTURE.THE UNIT WITH RACKMOUNT EARS HAS BEEN SOLD.THE REMAINING UNIT DOES NOT HAVE RACK MOUNT HARDWARE.Please read all descriptions. Email any questions or concerns before purchasing.Please see pictures for they are an integral part of the product description.As-is.