| 摘要 |
A filter (10) for a pair of data communication lines (12, 14), said filter (10) having an input (16) for connection to said data communication lines (12, 14) and an output (18) for connection to a communication device such as a modem or facsimile machine, the filter (10) comprising: a gas arrester (20) arranged to absorb voltage transients from said data communication lines (12, 14) provided adjacent the input (16); PTC resistors (28, 30) in series in each data communication line (12, 14) after said first suppression means (20); varistors (32, 34) provided after the PTC resistors (28, 30); an RF filter (36) after the varistors; and transient suppression diodes (46) provided after the RF filter (36).
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