| http://www.w3.org/ns/prov#value | - This transmission can take place continuously or periodically. [0024] The said channel can consist for example of an electric cable carrying a varying voltage or an optical fiber transmitting light pulses coincident with the time reference signal. [0025] The said master time reference unit can be located in either of the stations. [0026] The said time reference signal can for example consist of
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