| 摘要 |
<p>If the level detector 76 senses the presence of upstream signals above a specified frequency, for example 65 MHz, it operates the switches 54 and 56 to select diplexer filters 46,46 or 48,48 suitable for bidirectional operation with a higher frequency upstream signal. This self-adapting technique removes the need to replace the bidirectional amplifier 40 when network frequency bands are changed.</p> |
