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Synchronised Digital Clock Systems Computers Articles | February 6 http://www.cheapairmaxoutletsale.net/ , 2007
This article discusses the methods utilised to achieve synchronised digital clock time displays throughout an organisation. Focusing particularly on Ethernet Networked NTP Digital Wall Clock Systems utilising Power-over-Ethernet.

Synchronised digital clocks allow a number of individual time clock displays to show identical accurate time. Individual stand-alone digital clocks each drift at different rates eventually all display differing times. This article discusses the methods utilised to achieve synchronised digital clock time displays throughout an organisation.

Radio-Controlled Digital Clock

Many digital clocks are available with radio receivers that synchronise to radio time broadcasts that are freely available in many areas. Time and frequency broadcasts such as the DCF-77 broadcast from Germany, the MSF-60 broadcast from the UK and the WWVB broadcast from the US. These time and frequency broadcasts provide an accurate timing reference for digital clocks to synchronise. However, often installation problems are encountered due to the fact that in particular locations the radio signal quality may be very low or even non-existent. Mounting radio-controlled digital clocks in basements or inside metal structures or too close to electrically noisy equipment can all cause radio reception difficulties. Also Cheap Air Max 95 , radio transmissions are local to the transmitter and do not extend beyond a finite range.

Wired Digital Clock Systems

Many synchronised digital clock systems operate on a bespoke serial network. They utilise a multi-drop RS422 or RS485 wired serial network. Each clock is generally mains powered at the point of installation. The digital clocks synchronise to a master clock on the wired network that may be synchronised to a GPS or radio external time reference. Only an optimally located single external timing receiver is required to synchronise all the clocks. The advantage of such systems is that the equipment costs are fairly low. However, this can often be outweighed by the installation costs of a dedicated network for the clock system.

Ethernet NTP Digital Clock Systems