The system operators have to decide which channels to buy from the channel operators. Each channel operator usually provides a wide choice of channels from which the system operators can choose, after which a price has to be negotiated.
系統商必須決定要向頻道商購買哪些頻道，而各家頻道商也會拿出菜單任君選擇，兩者再針對價碼磋商。