Information on NTP Time Servers and Radio Timecode Receivera Last updated 1 March 1989 Time Servers Following is a list of Fuzzball time servers known to be connected to the Internet and in operation. When more than one address is given, preference should given to each in order. Primary Servers dcn1.arpa (128.4.0.1, 10.2.0.96), U Delaware, Newark, DE Synchronization: NTP primary (Spectracom WWVB clock) Service area: ARPANET east (IMP 96), SURANET Access policy: open access Contact: Dave Mills (mills@udel.edu) Note: shares access with dcn5.udel.edu to a single WWVB clock dcn5.udel.edu (128.4.0.5), U Delaware, Newark, DE Synchronization: NTP primary (Spectracom WWVB clock) Service area: ARPANET east (IMP 96), SURANET Access policy: open access Contact: Dave Mills (mills@udel.edu) Note: shares access with dcn1.udel.edu to a single WWVB clock dcn6.udel.edu (128.4.0.6, 10.2.1.96), Backroom Test Facility, Newark, DE Synchronization: NTP primary (Precision Standard Time WWV clock) Service area: ARPANET east (IMP 96), SURANET Access policy: development test only; please do not access on continuous basis Contact: Dave Mills (mills@udel.edu) fordgw.srl.ford.com (128.5.192.1), Ford Research Labs, Dearborn, MI Synchronization: NTP primary (True Time GOES clock) Service area: ARPANET east (IMP 111), SURANET Access policy: closed access; for use only by prior arrangement Contact: Fred Ball (ball@srlvx0.srl.ford.com) umd1.umd.edu (128.8.10.1), U Maryland, College Park, MD Synchronization: NTP primary (Spectracom WWVB clock) Service area: NSFNET, SURANET Access policy: open access Contact: Mike Petry (petry@trantor.umd.edu) or Louie Mamakos (louie@trantor.umd.edu) wwvb.isi.edu (128.9.2.129), USC-ISI, Marina del Rey, CA Synchronization: NTP primary (Spectracom WWVB clock) Service area: ARPANET west (IMP 27) Access policy: open access Contact Steve Casner (casner@isi.edu) ncarfuzz.ucar.edu (128.116.64.3), NCAR Supercomputer Ctr., Boulder, CO Synchronization: NTP primary (Spectracom WWVB clock) Service area: NSFNET, USAN Access policy: open access Contact: Don Morris (morris@windom.ucar.edu) truechimer.cso.uiuc.edu (130.126.174.40), U Illinois, Champaign, IL Synchronization: NTP primary (Spectracom WWVB clock) Service area: NSFNET, MIDNET, CICNET, ARPANET central (IMP 94) Access policy: open access Contact: Paul Pomes (paul@uxc.cso.uiuc.edu) fuzz.sdsc.edu (192.12.207.1), SDSC Supercomputer Ctr., San Diego, CA Synchronization: NTP primary (Spectracom WWVB clock) Service area: NSFNET Access policy: open access Contact: Gerard Newman (gkn@opus.sdsc.edu) clepsydra.dec.com (128.45.9.54), DEC Western Research Labs, Palo Alto, CA Synchronization: NTP primary (True Time GOES clock) Service area: DEC, ARPANET east (IMP 37) Access policy: closed access; for use only by prior arrangement Contact: Jeff Mogul (mogul@decwrl.dec.com) Secondary Servers fuzzgate.psc.edu (192.5.146.42), PSC Supercomputer Ctr., Pittsburgh, PA Synchronization: NTP secondary (stratum 2) Service area: NSFNET Access policy: open access Contact: Eugene Hastings (hastings@morgul.psc.edu) lilben.tn.cornell.edu (192.35.82.50), Cornell U, Ithaca, NY Synchronization: NTP secondary (stratum 2) Service area: NSFNET Access policy: open access Contact: Dave Mills (mills@udel.edu) on behalf of the Cornell staff fuzz.csc.org (128.121.54.20), JVNC Supercomputer Ctr., Princeton, NJ Synchronization: NTP secondary (stratum 2) Service area: NSFNET Access policy: open access Contact: Joanne Boyle (boyle@jvnca.csc.org) nsfnet-gw.umd.edu (192.41.177.92), U Maryland, College Park, MD Synchronization: NTP secondary (stratum 2) Service area: NSFNET, SURANET Access policy: open access Contact: Mike Petry (petry@trantor.umd.edu) or Louie Mamakos (louie@trantor.umd.edu) libra.rice.edu (128.42.1.64), Rice University Synchronization: NTP secondary (stratum 2) Service area: NSFNET, SESQUINET Access policy: open access Contact: Farrell Gerbode (gerbode@rice.edu) Other Servers macom1.arpa (10.0.0.111, 192.5.8.1), SAIC, Vienna, VA Synchronization: NTP secondary (stratum 2); line-frequency clock Service area: ARPANET east (IMP 111), SURANET Access policy: not recommended, except for testing Contact: Mike Little (little@macom2.arpa) swamprat.arpa (192.5.8.6), SAIC, Vienna, VA Synchronization: local net (stratum 0), line-frequency clock Service area: ARPANET east (IMP 111), SURANET Access policy: not recommended, except for testing Contact: Mike Little (little@macom2.arpa) patch.arpa (26.6.0.2), USECOM Patch Barracks, Stuttgart, W Germany Synchronization: NTP secondary (stratum 2), line-frequency clock Service area: MILNET Europe (IMP 2) Access policy: not recommended, except for testing Contact: Buzz Shaw (hshaw@dca-eur.arpa) dcn3.udel.edu (128.4.0.3), U Delaware, Newark, DE Synchronization: local net (stratum 0), line-frequency clock Service area: ARPNET east (IMP 96), SURANET Access policy: not recommended, except for testing Contact: Dave Mills (mills@udel.edu) Radio Timecode Receivers Following is a list of radio timecode receivers currently on the market. These devices are attached via a serial asynchronous line, which is used to send poll messages and receive responses in the following example formats: Spectracom clock: q ddd hh:mm:ss tz=zz (22 chars) Truetime clock: ddd:hh:mm:ssq (13 chars) Heath clock: hh:mm:ss.f dd/mm/yr (23 chars) PST clock: hh:mm:ss.fff yy/dd/mm/ddd status (49 chars) These formats are exhibited for example only. In some clocks an extensive repitoire of commands and formats are available. In the Fuzzball implementation the Spectracom and PST clocks are polled, which return the time-code string shown, while the other clocks run continuously. In the Truetime clock the start bit of the last represents on-time, while in the other clocks the first represents on-time. In the time code ddd is day of year, hh:mm:ss is time of day, f is fractions of seconds, and dd/mm/yr is conventional (US) date. In the Spectracom clock, q is " " for in-synch or "?" for off-synch and zz is the time zone (always 00 for UT). In the Truetime clock, q is a precision estimate in milliseconds and coded as follows: "?" +-500 msec, "#" +-50 msec, "*" +-5 msec, "." +-1 msec, less than 1 msec. In the Heath clock, the hh:mm:ss.f field is displayed as 0?:??:??.? before synch is first established and hh:mm:ss.? once synch is established and then lost again. Model 8170 WWVB Synchronized Clock Spectracom Corporation 101 Despatch Drive East Rochester, NY 14445 (716) 381-4827 This is a LF receiver and decoder for the WWVB station. Several of the Fuzzball time servers use this clock. There is no known Unix driver at this time. For expected accuracies less than 10 ms, a special one-second on-time signal produced by the clock must be used to fine-tune the indication. Model 468-DC Satellite Synchronized Clock True Time Division, Kinemetrics 3243 Santa Rosa Avenue Santa Rosa, CA 95401 (707) 528-1230 This is a UHF receiver and decoder for the GOES satellite. Two Fuzzball time servers (ford1.ford.com and bitsy.mit.edu) use this clock. Jeff Mogul of DECWRL (mogul@decwrl.dec.com) may provide info on a Unix driver. Model 1020 Integrated Time Source Precision Standard Time, Inc. 105 Fourier Avenue Fremont, CA 94539 (415) 656-4447 This is an HF receiver and decoder for the WWV/WWVH stations. One Fuzzball (dcn6.udel.edu) uses this clock. Support for this clock was written by Jeff Schiller (schiller@bitsy.mit.edu) of MIT and is included in the latest version of the ntpd daemon. Model GC-1000 Most Accurate Clock Heath Company Benton Harbor, MI 49022 (616) 982-3411 This is an HF receiver and decoder for the WWV/WWVH stations. One Fuzzball (dcn6.udel.edu) uses this clock for backup. So far as known, there is no Unix driver available. This receiver may no longer be in production. 8101 Automated Computer Time Service (ACTS) Time and Frequency Division, National Bureau of Standards US Department of Commerce Gaithersburg, MD 20899 This is a package of C software for the IBM Personal Computer. It can be used to call a special NBS number using either 300-Hz or 1200-Hz modem and set the computer clock. The latest version has been adapted to run on Unix workstations. Dave Mills sends