The module is intended to be used on system integrators host board to support transmission over DWDM links in Metro networks. As shown in Figure 1-1, it is comprised of high-data lanes, a single reference clock from hosts, a single 3.3 V power supply, an MDIO interface, and dedicated alarm and control pins. The OM8769XX200 module uses a 104 pin CFP2 MSA connector for all electrical interfaces with the host board, whereas the optical interfaces on the line side are provided through the optical receptacles on the CFP2. The module can be portioned into three functional parts: Tx path, Rx path and Control & Power block. All control interface pins are routed to the MCU and oDSP. MCU is also used for other fast controls needed inside the module such as modulator bias adjustment, firmware management, overall control coordination and status reporting.