Recently, he noticed his connection dropping and the phone began crackling while in a call. The crackling is only heard by him, not the calling/called party (which I thought was weird)
Initially I figured it was a faulty filter, given that the problem was new, so we replaced it but the problem persisted.
Next I checked for faulty equipment in his house. He only has one jack point so there were no sneaky phones plugged in directly. He doesn't have Sky or a monitored alarm either :\
I removed the filter and modem and plugged the phone directly into the jack and called 120. The call was crystal. The modem! I hooked him up with a Vigor 120 a couple of years ago and it has been rock solid since then but I figured maybe two years was its lifespan...
I checked the modem admin portal and sure enough, saw a hew hundred recorded RX CRC errors. I watched it for a time and they would build up (sometimes into the thousands) then the modem would lose connectivity and reboot to begin the cycle again.
I went home and grabbed my Vigor 120 (known to be good, never dropped connection and I work it hard) and dropped it in (I used my AC adapter and cables) and saw identical behaviour.
I don't have another spare modem on hand to test (I'm waiting for my brother to bring his down) but does anyone know what might be causing this?
I have also tested running just the modem -> filter -> jack and still see RX CRC errors popping up as soon as the modem reboots.
Modem stats are as follows:
Up Speed: 977022
Down Speed: 14642423
SNR Margin: 11
Loop Att.: 18
The stats are pretty good for ADSL2+, I have seen the SNR Margin & Loop Att. fluctuate some but can't reliably reproduce the fluctuations.
TIA for any insight.