NTP Master Clock system


MNP-25 | 2.5″ Digits | $465.

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.

There are multiple public time servers available from government agencies as well as public companies, that allow a “ping” time request sent to them every ~ 5 minutes.
NTP accuracy is ~ 100 milliseconds.

The DDS NTP master can be pointed to either a local time server or a public time server and use the signals to correct it’s own internal clock.

The master has its own backup battery and keeps a very accurate time of its own.
The master will send a packet of time to all the slaves and keep them synchronized to its own clock, thus saving maintenance time and keeping everyone in your organization on the same time.

The master can be adjusted to a specific time zone and day light savings, and will adjust automatically with the DST changes of the selected region.

Our Master clock can connect to its slave’s via wired connection or wirelessly.

A list of public time servers:

NIST Internet Time Servers – http://tf.nist.gov/tf-cgi/servers.cgi

Digital clock system with POE

POE Enabled Power Over Ethernet clock system

PoE (IEEE802.3AF STD) is gaining popularity due to its cost savings, allow
customers reduce the cost of AC outlet installations . In recent years PoE has
improved significantly and now allows up to 60W per port.
POE can deliver power of up to 100 meters and with some power injectors up to 200
meters.
Most POE’s will run on ~45-55v DC to allow voltage degradation over large distance,
while the end device will reduce it to its required voltage of 5-24 volts.
Installers will need to calculate the power required to run multiple devices on the
same line and add POE injectors as required.
DDS displays, clocks and timers allow you to power our devices using
POE enabled switch or using POE injector.
Using DDS NTP synchronization also allow both low power and automated
time synchronization to your company local network time server of your choice.
In a typical installation, the customer will have a POE switch or POW injector
that will feed DDS devices.

Common Digital Clock POE (power over ethernet) installation

Digital Display POE clock system for schools, hospital small and large offices

 

 

 

 

 

 

 

 

 

  • POE Switch and POE injector guideline
    POE SWITCH TYPE or POE injector DDS Device
    SINGLE DISPLAY UP TO 4”
    DC OUT 45-57VDC 15W DC IN 45-57VDC
    DC OUT 12V .5 AMP MAX  10W
  • SMALL DISPLAYS UP TO 2 ZONES
    DC OUT 45-57VDC 15W DC IN 45-57VDC
    DC OUT 12V 1AMP MAX  10W
  • SMALL DISPLAYS UP TO 4 ZONES
    DC OUT 45-57VDC 25W DC IN 45-57VDC
    DC OUT 12V 1.5 AMP MAX 18W
  • MEDIUM DISPLAYS UP TO 8 ZONES
    DC OUT 45-57VDC 50-60W DC IN 45-57VDC
    DC OUT 12V 3.5 AMP MAX 40W
  • DDS NTP SYNCHRONIZATION MODULE plus POEKEEP CLOCK SYNCHRONIZED TO AN NTP SERVER ALL THE TIME.
    ABILITY TO USE INTERNAL OR EXTERNAL TIME SERVER – CHANGE ZONES
    , NTP SERVERS AND DAYLIGHT SAVINGS USING WEB BROWSER

Download PDF: POE Digital Clock System

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