private function compress($dwnlSnap, $pv, $calcId)
    {
        $in = new \Praxigento\Core\Data();
        $in->set(PPhase1::IN_DWNL_PLAIN, $dwnlSnap);
        $in->set(PPhase1::IN_PV, $pv);
        $in->set(PPhase1::IN_CALC_ID, $calcId);
        $in->set(PPhase1::IN_KEY_CALC_ID, EBonDwnl::A_CALC_REF);
        $in->set(PPhase1::IN_KEY_CUST_ID, QBSnap::A_CUST_ID);
        $in->set(PPhase1::IN_KEY_PARENT_ID, QBSnap::A_PARENT_ID);
        $in->set(PPhase1::IN_KEY_DEPTH, QBSnap::A_DEPTH);
        $in->set(PPhase1::IN_KEY_PATH, QBSnap::A_PATH);
        $in->set(PPhase1::IN_KEY_PV, EBonDwnl::A_PV);
        $out = $this->procPhase1->exec($in);
        $updates = $out->get(PPhase1::OUT_COMPRESSED);
        $pvTransfers = $out->get(PPhase1::OUT_PV_TRANSFERS);
        $result = [$updates, $pvTransfers];
        return $result;
    }