This is what the inside of the cable box on the side of my house looks like.
Basically it's a mess. My friend Jeff was over the other day looking at it and told me that that old splitter is causing data loss. A new one needs to be swapped in there.
But then we looked at it and saw that the splitter is not being used on one end. So the cable is being split, data loss is occuring, but it doesn't actually need to be split. This splitter needs to be removed and the cable needs to be connected together directly with a barrel connector.
Here's some more info on splitters:
broadband | Cable Modems and Wiring Issues 4. Splitters:
"Q: What do the numbers on a splitter mean? (#3398)1. Splitters are bad
A: Each splitter is different, but here is what most of them mean:
The numbers on each OUT leg of the splitter show how much signal is lost after passing through that leg.
For example, a 2 way splitter has 3.5 on each leg. That means that 3.5db was lost as the signal passed through that leg.
Note: The signal loss written on splitters is how much is lost at around 50 to 100Mhz. The higher a frequency is, the more is lost over distance. This applies to splitters too. In reality, a cable modem is probably losing more like 4 to 5db when passing through this same splitter."
2. Old splitters are worse
3. New splitters are better
4. No splitters are best of all