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 DLM31K 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 NFE16P 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 DLM31K is used upstream from a transformer for connection with
lines to remove common mode noise.
The NFM21P, NFM41P, and NFE16P 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
Model |
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|
ADSL Modem (CPE)
