Network Time Synchronization Servers at the U.S. Naval Observatory

reportActive / Technical Report | Accession Number: ADA494738 | Open PDF

Abstract:

Responding to an increased demand for reliable, accurate time on the Internet and Milnet, the U.S. Naval Observatory Time Service has established the network time servers, tick.usno.navy.mil and tock.usno.navy.mil. The system clocks of these HP9000747i industrial work stations are synchronized to within a few tens of microseconds of USNO Master Clock 2 using VMEbus IRIG-B interfaces. Redundant time code is available from a VMEbus GPS receiver. UTCUSNO is provided over the network via a number of protocols, including the Network Time Protocol NTP DARPA Network Working Group Report RFC-1305, the Daytime Protocol RFC-867, and the Time protocol HFC-868. Access to USNO network time services is presently open and unrestricted. An overview of USNO time services and results of LAN and WAN time synchronization tests will be presented.

Author(s):
Schmidt, R. E.
Author Organization(s):
NAVAL OBSERVATORY WASHINGTON DC
Descriptive Note:
Conference paper
Supplementary Note:
Presented at the Precise Time and Time Interval (PTTI) Applications and Planning Meeting (26th Annual) held in Reston, VA on 6-8 Dec 1994. Published in the Proceedings of the Precise Time and Time Interval (PTTI) Applications and Planning Meeting (26th Annual), p175-184, 1994.
Pagination:
0010

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
NOBS
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric; JCA_6.1_Information Transport; JCA_6.4.1_Secure Information Exchange; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support; JCA_6.4_Information Assurance; JCA_5_Command and Control; JCA_5.3_Planning; JCA_8_Building Partnerships
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*SYNCHRONIZATION(ELECTRONICS), *COMPUTER NETWORKS, CLOCKS, SYMPOSIA, TIME
Field(s)/Group(s):
Computer Systems, Test Facilities, Equipment and Methods
Keyword(s):
*NETWORK TIME SERVERS, *TIME PROTOCOLS, USNO(UNITED STATES NAVAL OBSERVATORY), NTP(NETWORK TIME PROTOCOL), TIME SYNCHRONIZATION, UTC(USNO), UTC(COORDINATED UNIVERSAL TIME)
Report Date:
1994 Dec 01
Creation Date:
2009 Mar 25