Abstract: This document contains a specification for a substation relaying and control wide area network based on a SONET or possibly a T Carrier (Small Site) communication concept. At this level every device at the substation, plant or any place where control of high voltage (600 Volts and above) equipment, can be networked. Every secondary signal can be digitized for control, alarm, and indication. SCADA equipment can be interfaced or replaced with this concept. Metering equipment can be interfaced to SONET Protocol without actual secondary values at inputs to control house meter. Panel device(s) footprint will be reduced thereby reducing the control housing dimensions. Stub-up conduit quantity for the power equipment will be reduced thereby reducing labor and material costs. Inventory stock will be reduced thus minimizing storage fees. Reliability and security will be increased. Fault monitoring will be simplified. Surveillance will be more practical.