Trade to Trade settlement is a segment where every trade results in delivery and subject to full margin equivalent to value of the order. Client should not place order in Trade to Trade shares for intraday. Each share purchased in this segment need to be taken delivery by paying full amount. Each share sold in this segment need to be given delivery of stock.  The settlement of stocks available in this segment is done on a trade for trade basis and no netting off is allowed for the day.
For example: In Normal rolling settlement, one can trade stocks intraday (One can buy and sell a security on the same day).
Suppose you buy 1,000 shares of FCEL at Rs.20 per share and sold these 1,000 shares for Rs.25 per on the same day (before the close of trading). You have gained Rs.5 per share (less brokerage/Other Expenses). This is the amount you will receive from your broker in the normal rolling settlement system.
Suppose FCEL is in trade-for-trade settlement, you will have to pay Rs.25,000 to take delivery of the shares you bought and also all charges and STT applicable for delivery trades. Similarly, the quantity you have sold will have to be presented for delivery in Demat A/C and also pay all charges and STT applicable for delivery trades. The Trade-for-Trade segment considers each transaction individually.