Noob Question : ADSL Router setup - Plugging line into power adapter

mk97

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Nov 10, 2016
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hi there, i Have a huawei router. on the power adapter that plugs into the wall, it has two connections for line in and line out, I was just curious about this since on my old billion router from mweb i just plugged the line straight into the router.
Any important reason why there is a provision for the line on the power adapter?

I presume that if i use this i would have to plug in the line directly into the power adapter, then get another line to plug from the power adapter to the router.
 
Probably some form of surge protector for the line itself?
 
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