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If a broker dealer accepts customer limit orders it is required to protect the order and may not trade for its own account at prices that would satisfy the customer’s limit order. The order protection rule is also known as the Manning rule. The Manning rule states that a firm may not compete with a customer’s limit order by executing an order for its own account at a price that would satisfy the customer’s limit. If the firm executes an order for its own account at a price that would satisfy the customer’s limit order, the firm must execute the customer’s order at the same price and for the same number of shares within 60 seconds.Broker dealers that route orders to ECNs or other firms to be displayed must still protect the customer’s limit order and are not relieved of their obligations under the Manning Rule. If the market-making desk is holding a customer’s limit order that is subject to the Manning Rule, no trading desk anywhere within the firm may knowingly execute a proprietary order that would compete with the customer’s order. If the firm has sufficient barriers between its trading desks and the other desk does not have knowledge of the customer’s order, the other desks are not bound by the Manning Rule.