Looks like Trimble and Cisco got together on a PPS implementation for the 7200, starting with 12.0T trainwreck:
http://www.cisco.com/en/US/docs/ios/12_1t/12_1t1/feature/guide/dtrimble.html Since I don't have any 7200s any longer (thank goodness), I checked and it seems that the 6500s support this as well on the console serial port: 6509-rtr(config-line)#ntp ? pps-discipline Use PPS pulse to discipline system clock refclock NTP Reference Clock and 6509-rtr(config-line)#ntp refclock ? telecom-solutions Telecom Solutions GPS trimble Trimble Navigation TSIP Protocol It looks interesting, and if the code is just looking for a PPS transition on the CTS or RI, you might be in luck with any external PPS... BUT be forewarned, IOS is a cooperative multitasking operating system (at least prior to the new "modular" stuff), so your accuracy is going to vary depending on loads, processes, etc. I wouldn't count on this being to spectacular... probably no better than an external NTP source. And of course, you can always call the TAC for more assistance! ;-) 73, Dave AF6KD On Fri, Oct 3, 2008 at 2:39 PM, Robert Vassar <[EMAIL PROTECTED]> wrote: > > > > I've been fiddling around with an old Cisco router here at the house > to brush up. We have an IPv6 project going at work, and our WAN > provider provides no native transit, so I'm looking at doing some > tunneling. Anyhow... I discovered IOS 12.1 and above have native NTP > capability. I don't have the exhaustive IOS command reference, and I > suspect it's a limited NTP implementation. I'm wondering if it's > possible to tie a GPS unit to a router serial port and gain a stratum > 0 refclock. > > > Any Cisco guru's on the list? :-) > > > > Cheers, > > Rob > > > _______________________________________________ > 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. > _______________________________________________ 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.
