In telecommunication, the power margin is the difference between available signal power and the minimum signal power needed to overcome system losses and still satisfy the minimum input requirements of the receiver for a given performance level.
Note: System power margin reflects the excess signal level, present at the input of the receiver, that is available to compensate for (a) the effects of component aging in the transmitter, receiver, or physical transmission medium, and (b) a deterioration in propagation conditions. Synonymsystem power margin.
Moreover, while a stock margin is typically 50% of the value of the purchased assets, a futures margin generally ranges from 5-10% of the contract value.
Maintenance margin is usually less than initial margin, so the amount of cash one needs to carry a position is less than that required to establish the position.
Margin requirements are met by the cash or equity in the trader's account and that equity is eroded if his futures position starts to lose money.
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