I have a Motorola SB5100, about a year old. This past week I have been frequently losing connection to my ISP (Comcast Detroit). Cable feed is separate drop from pole, just before modem hits a splitter one (-3.5dB) leg to modem, other (-3.5dB) to a TV in same room (yes, I subscribe to video service, and there are no traps anywhere along the feed). This splitter and cabling is a commonly used arrangement, exactly same as cable company installations. Last week the SB5100 was suddenly experiencing frequent loss of signal, "send" lamp blinking and "online" lamp out. Pulled up the modem diagnostic pages, showed Downstream signal at -3 dBmV, s/n 35dB; Upstream 55dBmV. I removed the splitter and show, predictably, Downstream 0 to +1 or +2 dBmV, s/n 36-37dB, and with the splitter out, seem to be holding on to the signal. I am quite certain that in the past, signal levels with the splitter have not been any different than what I'm getting now. Since I've been running with this arrangement (splitter in system) for almost a year, does this problem indicate something suddenly wrong with the modem, or just marginal signal levels from Comcast. It would seem odd to me for a modem to suddenly be sensitive to a small variation in signal level. Anyone with similar experience? I did call Comcast, attempted to explain the situation. A tech came by, stuck a meter on the line at the pole and in the room and declared that signal levels were at spec. He was predictably mystified when I showed him the SB5100 Configuration Manager and the Signal page http://192.168.100.1/signal.html.He had no idea such a thing was available. So I'm not optimistic that I can be successful at convincing Comcast that there may be a small tweak on their end, headend, access point, line amp, to make this problem go away. Or do I just lose the splitter and go back to over-the-air TV in the computer room?
Chuck Reti Detroit MI