On Wed, Feb 26, 2014 at 2:05 PM, Chris Albertson <[email protected]>wrote:
> > Chris, even with Wi-Fi connected computers, mostly running Windows, there > > is a huge difference between talking to a stratum-1 server on my LAN > > compared to running just Internet servers. Our experiences differ, as I > am > > on a cable modem connection from the UK's Virgin Media. Folks need to > > measure what performance they are getting and choose their own best path, > > otherwise it's guesswork. > > > > Yes, exactly. It depends entirely on your internet connection. As soon as > you get even "slow" 10Mb/s fiber the distinction between LAN and Internet > starts to melt away. The problem with Cable TV is that it is a shared > connection with who knows how many others. Shared media have collisions > with back off and retries and are not deterministic. > Not generally with broadband. (True broadband that is, such as Internet-over-cable. I do find it annoying that all higher-speed, i.e. non-dial-up, access is referred to as "broadband".) There are no collisions coming downstream because there is only one source -- the head end. There you just have variable queueing delays if a burst of traffic exceeding downstream capacity arrives at once. Collisions are possible on the upstream but less likely. I do have a local NTP server. I had one back in the days of dial-up phone > modems and still have one with my current fiber connection. I was just > pointing out that the local NTP server is less useful as the Internet > connections get better. > True, but far more deterministic. As you suggest, a local NTP server is independent of upstream traffic, queueing, and backoff/retry delays. Personally I would like to have a local stratum-1 source for that reason. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 [email protected] +1.916.877.5067 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
