Visitor
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2 Messages
Can't use a splitter
We recently had a lightning strike that fried the modem. I got a new modem and when I hooked it up internet wasn't working. I disconnected the splitter and hooked the line coming from the street directly to the cable going to my modem, It worked fine. When I connect a splitter, I have no internet. The only splitter I had was on the box at the side of the house, there are no other splitters in the house. I've tried replacing the splitter with several different new ones and none of them work. I have noticed my upstream power levels are really high, +58dbvm. Could this be causing the problem?
Jim721
Gold Problem Solver
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3.5K Messages
2 years ago
Possibly your downstream power is so low that adding a splitter simply lowers your downstream to the point of no connection. +58 on your upstream is a major issue and way out of spec. You need a tech out to investigate and fix your issues. Can you post all your modem signal logs ?
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user_4da8ae
Visitor
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2 Messages
2 years ago
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zandor60657
Contributor
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200 Messages
2 years ago
Sounds like the lightning strike may have damaged the wiring too. Low downstream signal strength and high upstream power levels can be symptoms of bad/damaged cable. +58dbvm is way high and out of spec on upstream like Jim said. The messy bit is it's hard to guess where the damage is. It could be in your house or it could be outside in Comcast's network or both.
Did anything else get fried by the lighting strike? It's not uncommon for lightning strikes to hit comms lines. If nothing else got zapped it's likely the damage is to Comcast's lines. Personally I'd inspect the cable in my house and maybe redo it before calling a tech out, but I have all the tools and leftover cable, connectors, etc. from wiring it after I moved in. If you don't have a spool of coax, connectors, and tools laying around just call Comcast and have them send a tech out. A spool of RG6, connectors, and all the tools you need to do coaxial cabling properly will cost you more than a tech visit *if* the problem is in your house. Maybe a little less if you buy cheap tools.... but then you're buying cheap tools. If it's outside they won't charge you.
~20 years ago I got hit with a strike that came in over a phone line. It fried my DSL modem and a NIC card in the computer I was using as a router, but somehow the external transceiver between the router and the NIC survived. No damage to anything else.
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