The SH3 is a 16 channel downstream, 4 channel upstream DOCSIS 3 modem.
You seem to be confusing 16 channel modems with DOCSIS 3.1, they aren't the same thing. There are exactly zero DOCSIS 3.1 home gateways available right now, and even when they become available they'll be very expensive.
Was delivered on a 16 channel modem -
http://www.icbn.com.tw/product.php?act=view&no=37