This IDC update reviews 1Q09 end-user revenue and shipments in the Ethernet switch market and shows the quarter-over-quarter (QoQ) and year-over-year (YoY) changes. The information in this update stems from IDC's Worldwide Enterprise Networks Tracker service, which delivers a pivot table of end-user revenue, manufacturing revenue, and port shipments by vendor, layer, speed, form factor, power over Ethernet (PoE) capabilities, and average pricing seven weeks after the close of the calendar quarter. (For more information, contact your IDC representative.)