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Price trade inside the channel for considerable period and then breakout from the channel. This is likely to be a new trend beginning. Traders can open buy position when price establishes above the upper channel line. Short position is opened when price trade below the lower channel. Trading activity inside the channel indicates lack of strength in the current trend. Usually in an up trend most of the trading happens inside the upper channel line and mid channel line. In down trend, price action is more likely to confined within the lower channel line and mid channel line.
PCC is used in long time frame charts like daily or weekly charts. The default value for parameter percentage in PCC is 2. Test the channel with different values for parameter percent and use the best parameter value for each instrument. The best value for percent depends on the volatility of the instrument. PCC avoids many false signals that occur with other channel indicators in tight trading ranges by choosing a proper value for parameter percent.