Low SnR will mean a disconnection when it falls to values like 7 or below.
Many cases when your best case SNR is 8dB you will not be disconnected, but sometimes due to spike in line, noise etc., your SNR will drop below 5dB for a very small fraction of time.
This will cause disconnection.
When you have a high SNR, fluctuations of even 10dB intermittantely will not cause problems.
I suggest you continue using without splitter for now.
Having a low SNR may also negatively affect download speeds in some modems.
However if a modem is designed for 8Mbps, and the plan is 256kbps, and SNR causes modem to downgrade to 1Mbps you won't notice, because your plan is anyways below what modem is capable off.
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