> I've tried all you suggest but a new NIC or a new > cablemodem. The SB4100 is the SB3100, but with > a USB port (unused) and a "standby" switch on the > front. Otherwise the units are identical, so unless mine > is bad (a possibility -- but how to test the unit?), I don't > think
I just ran across this post at DSL Reports: ******** "You can check various diagnostics for the 2 way surfboard modems here 192.168.100.1/" This is the page we, as technicians, pull up. I really tells a lot. Especially the SIGNAL page. ยป192.168.100.1/signal.html What you are looking for is DOWNSTREAM POWER LEVEL. This is the level coming INTO the modem. YOU WANT THIS VALUE BETWEEN +3 AND -5 dBmv. Also look at UPSTREAM POWER LEVEL. This is showing how hard the modem is working to "get out" of your home. You want this maybe 55dBmv or below. Any higher is saying the modem is struggling to get out. This can be due to old cable in house. OR... The most common reason... Road runner is going through more than one splitter. Roadrunner MUST be connected via dedicated cable line. Meaning, when the cable comes in at outside of house... Roadrunner must split at a two way splitter and go straight to modem. ******** He mentions Roadrunner, but the other information may be applicable to you (assuming you've got something other than RR). Hopefully the 'signal' page will be quite helpful. Good luck Hall
