Shares of networking equipment maker Acme Packet (APKT) are down $2.59, or over 14%, at $15.81 after the company this morning warned it will miss Q2 expectations, citing slowing service provider spending on equipment. Shares of fellow networkers F5 Networks (FFIV) and Riverbed Technology (RVBD) are also taking a hit today, with F5 down $7.54, over 7%, at $93.90, and [...]