What is the use of USB port on Huawei HG655b ?
for connecting to pc using usb if lan port is not available for any reason.
no,that port is for connecting not sharing.
again,no.ftp is just a way of sharing data & also you can not use a "out" port as "in" port without hardware/software modification.
*setuprouter.com/router/huawei/hg655b/manual-163.pdf
see the diagram on p18.
check phone settings then(line type:dial or tone etc).also does the phone work if telephone line is directly connected to it.
then try connecting phone through splitter to modem(check diagram).
by how much?if both snr values are above 15 & attn values below 50 then it is alright.
snr is low but if connection is stable then it is fine.