The EDT OCMP (formerly OCM) is a mezzanine board that pairs with an EDT PCI or PCI Express main board to support electrical or optical 1 GbE, SONET OC3/12/48 (SDH STM1/4/16), or both. The OCMP has two VCXOs (volt-controlled crystal oscillators) that are programmable or settable to multiple frequencies. Two SFP (small form pluggable) transceivers ae included. Each SFP supports 1 GbE or OC3/12 (STM1/4), and one also supports OC48 (STM16). The board has up to 2 GB of DRAM for snapshot recording and data buffering.