Step 2 : solution for others
Choose your system of time distribution. In an installation with several clocks, this system uses a master clock to synchronise all the slave clocks reliably and on the same time base.
Synchronisation of a network of clocks in one or more buildings without connecting the clocks with cables.
Transmission of a complete time message (time and date) over a two-wire line.
Synchronisation by a time server of all the clocks connected to the computer network.