✔ 最佳答案
I did the same (將有線modem搬入書房) as yours before and it worked fine. Likely your TV cable between living room and 書房 is very bad and is causing great signal lost.
If you have checked the cable and found nothing unusual, you may consider using a pair of power plugs:
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Aztech HomePlug HL105E
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85Mbps
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up to 200m point to point
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56bit DES encryption security
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auto MDI/MDIX interface
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They are really just plug-and-play. Virturally no installation. They cost high (HK$680 a pair). But it save the ugly cables and hassles, and they can be reused even if you move home.
C How