The COE (Central Office Equipment) uses high-order filters so as to prevent signals from leaking from a down line to an up line. This requires steeper filter characteristics and thus parts with a high Q-value. Having high Q-values, Murata's LQH Series are components best suited to constituting those filters.
The DLW21S is used upstream from a transformer for connection with lines to remove common mode noise.
Since the COE copes with a large number of lines on one board, it consumes much current, and its power circuit requires parts with high current rating. It also produces high noise and requires a large number of filters. The NFM21P, NFM41P, and NFE61P are recommended as chip parts for DC power supply which accommodate 2A-3A, and the DSS/BNX Series are recommended as parts with leads which accommodate 6A-10A.
The CPE (Customer Premises Equipment) uses high-order filters so as to prevent signals from leaking from an up line to a down line. This also requires steeper filter characteristics implemented by adopting high-Q parts, and the LQH Series are best suited for this purpose.
The DLW21S is used upstream from a transformer for connection with lines to remove common mode noise.
The NFM21P, NFM41P, and NFE61P are recommended as chip parts for DC power supply which accommodate 2A-3A, and the DSS Series are recommended as parts with leads which accommodate 6A-10A.
Noise Suppression Examples in Network
