AVN-GMCS Grandmaster clock is a master clock for AoIP audio network with built-in GPS receiver. IEEE1588-2008 PTPv2 (precision time protocol) is used for synchronization of all nodes in the network. AVN-GMCS supports (RAVENNA), Media (AES67) and AES-R16-2016 (SMPTE-ST 2059-2 & AES67 compatible) profiles, and also has the ability to save custom profiles. AVN-GMCS is based on a temperature compensated oscillator (TCXO) and has an accuracy of 1 ppm or max +- 1 second / 11.5 days.