How to make Subscription work inside router-outlet (angular2)?

Question

Angular

If you display it outside the router, everything is fine, but in the router it only works on the first boot (component on the main page). The code is in the constructor, if you push on ngOnInit, nothing changes :/

this.subscription = this._telemetry.telemetryData$
      .subscribe(telemetryData => this.telemetryData = telemetryData);