Code:

consensus.powLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
   consensus.nRuleChangeActivationThreshold = 6048; // 75% of 8064
   consensus.nMinerConfirmationWindow = 8064; // nPowTargetTimespan / nPowTargetSpacing * 4
   consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
   consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
   consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008

   // Deployment of BIP68, BIP112, and BIP113.
   consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
   consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1485561600; // January 28, 2017
   consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1517356801; // January 31st, 2018

   // Deployment of SegWit (BIP141, BIP143, and BIP147)
   consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
   consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1485561600; // January 28, 2017
   consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018

   // The best chain should have at least this much work.
   consensus.nMinimumChainWork = uint256S("0x000000000000000000000000000000000000000000000006805c7318ce2736c0");

   // By default assume that the signatures in ancestors of this block are valid.
   consensus.defaultAssumeValid = uint256S("0x1673fa904a93848eca83d5ca82c7af974511a7e640e22edc2976420744f2e56a"); //1155631

What do these parameters and what put in there. I try find any info about this parameter's but dint find. I update the altcoin from old sources to new, but stuck on this segwit params.