Does a DOCSIS 1.0 modem slow down other cable Internet users? We own an old Motorola Surfboard SB4100 cable modem connected to a Comcast cable system. Websites say it was DOCSIS 1.0 compatable. And some websites claim it can't be updated to DOCIS 2.0 or later protocals. Comcast says that it can not take full advantage of the available Internet bandwidth we are paying for, and suggests we update. (They would be happy to rent us a faster modem :smoking. But it is fast enough for us to see Youtube and Hulu videos, which are the most demanding applications we have, as we rarely use more than one Internet device at once. But 1. Does the modem's presence on the local net substantially slow down our neighbors (who presumably connect to the same cable wires), like a tricycle on an Interstate highway, so that they are also not getting the service they are paying for? E.g., does it force the local gateway to operate in a slow mode for everyone in that group? Or do my packets take up more time bandwidth than than they "should", because they operate at a slower baud rate? (Do they?) (Since we aren't heavy users, we wouldn't feel guily about that - just curious.) If I am slowing everyone else down much, how can I tell if we are the only ones doing so, so that replacing our modem would help everyone else out? 2. Sometimes there are glitches in the video streams we watch from Youtube and Hulu and such, as though there are dropped packets. Likewise, sometimes Yahoo and Google searches take about a minute. Would a modern modem make such issues less frequent? E.g., does Comcast assign us lower priority due to the modem age, or because it isn't leased? 3. Is the continued use of a DOCSIS 1.0 modem particularly unusual today? 4. Our leased cable Motorolla RNG200N TV DVR box has an ethernet port, which presumably means it is capable of acting as a cable modem. Would Comcast charge us to use that as such in place of our SB4100? AFAICT, the RNG200N were at least DOCSIS 2.0. Thanks.