The TCG 01-G is a highly accurate, fully featured GPS and GLONASS (GNSS) clock. With enhanced cyber security features that support NERC CIP requirements, the TCG 01-G is designed for use in modern day smart grid / smart substations, electricity distribution, transmission, generation protection and control systems. The clock synchronizes multiple IEDs (Intelligent Electronic Devices) within a network, including protection relays and remote telemetry units to enable accurate time stamping. The TCG 01-G supports IEEE 1588 v2 (PTP) and IEC 61850.