downlink system for drilling and method of producing a signal using a downlink reciprocating pump

The invention relates to a downlink system (700) comprising: at least one main drilling fluid pump in fluid communication with a drilling fluid reservoir at an inlet of the at least one pump drilling fluid and in fluid communication with a riser (708) at an outlet of the at least one drilling fluid pump; anda downlink pump (711) reciprocating in fluid communication with the standpipe at a discharge downlink pump (711) to move alternatif.L'invention also relates to a method for producing a process signal using a downlink reciprocating pump.