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Time Servers |
Coetanian Systems - Time Synchronization Solutions:
WinSNTP - Questions & Answers
Stuart Phillips, stu@coetanian.com
- What applications benefit from Accurate Time ?
Many distributed computing application need accurate time. Here are some of
the applications requiring accurate time in use by our customers.
- Hardware and software development teams (to insure consistent builds)
- Control centers for audit trails
- Distributed Electronic Purchasing systems
- FAX distribution over the Internet
- Traffic control systems
- Electronic News gathering
- Electronic Mail synchronization
- Shipboard instrumentation control
- Traffic revenue collection systems
Time
bombs Setting, adjusting, and maintaining synchronized clocks on a network by
Howard Stern, SunWorld Online 1996, hal.stern@sunworld.com
Accurate time-keeping affects many day-to-day functions as well as issues critical
to system administrators:
- File modification times are consulted by
make, so skewed desktop
clocks may result in erratic actions.
- Secure RPC, NIS+, and Secure NFS rely on timestamps for verifying requests. Client
clocks that stray into network tardiness result in rejected requests.
- Digital signatures (see "PGP:
The key to your heart" SunWorld Online February 1996) or transaction
timestamps that are used to sequence events must refer to a time base that is not machine
dependent.
- Attempts to correlate network activity, performance data, and system log messages from
multiple hosts require a single, global timepiece for the network. You can't track a
performance problem across several machines if you can't lay out events on a single,
absolute timeline.
David Mill's Time Server
- Welcome to the Time WWW server. The purpose of this server is to provide the latest
information on Network Time Protocol (NTP) and other related clock synchronization
products. - Dave Mills, mills@huey.udel.edu
Datum Products
- Datum supplies NetSync products for wireline and wireless system synchronization and
frequency references
- Datum TymServe network time servers and bus level modules synchronize computer
workstations
- Datum high performance cesium atomic clocks, rubidium oscillators and quartz crystal
oscillators are available for satellite applications.
- NISTIME corrects PC clock.
- Bancomm Timing Division - Datum Inc - We
manufacture a broad line of timing instrumentation that includes bus level products (AT,
PCI, VME, etc.), network time servers, precision laboratory GPS timing receivers, airborne
products and much more. We are one of five divisions of Datum Inc. All Datum divisions are
engaged in the business of providing time and frequency products
Réseaux IP Européens: (RIPE) Comparison of clock
technologies:
- NTP/Network Time Protocol
- Accuracy determined by the hardware
- Needs clock servers, not available everywhere
- Free software, cheap
- Radio Time Servers
- Accuracy up to a few ms
- Needs a timing signal, not available everywhere
- Expensive compared to GPS
- GPS/Global Positioning System
- Accuracy up to 200ms
- Available everywhere
- PC-based cards are available for around $1000
- Needs an antenna
Department of Mathematics, University of Alabama Using the Naval Observatory Clock
About Central Time Servers
- Handling PC's System Date/Time Before Y2K Testing
Softseek.com
- Clock, Clocks, Alarm, Alarms, and Reminder, and Reminders Software
Copyright 1988-2012 Richard
Collins, All Rights Reserved