code: def _sent_by(self, origin, cable):
          
          self._assoc(psis.SENT_BY_TYPE,
                      psis.SENDER_TYPE, origin,
                      psis.CABLE_TYPE, cable)
docs: \
  
          `origin`
              Topic identity (commonly a subject identifier) of the originator of the cable
          `cable`
              Topic identity (commonly a subject identifier) of the cable.