Home / Support / Comparison of NIS TELNU and Other Clock Systems

Currently, the classic minute pulse-controlled slave clock systems (= pulse clock / pulse counter) continue to dominate the market due to their low acquisition costs, in spite of the considerable work involved and difficulties to be overcome at start-up, during breakdowns or during system expansions.

Thanks to their high operational reliability, intelligent clock systems (IRIG-B, AFNOR) are utilized, for example, in the military sector, but these systems have up to now been very costly when compared with pulse clock systems.

NIS-TELNU is the first intelligent clock system with high operational reliability which has a price advantage due to its low installation costs.

Technical Comparison

	Pulse Clock	NIS TELNU
Operating Voltage	12/24/48/60V DC	24V DC
Connection Type	Twist pair telephone cable	Twist pair telephone cable / also if with seconds
Signal Type	Alternating polarity minute pulse	Absolute time (seconds, minutes, hours, day, month, weekday and year) with power supply
Clock Hand Position at Start-up	All connected and new clocks must be manually reset to 12:00, and then be restarted.	Once the master clock has been set to the correct time, each individual slave clock can be connected in sequence. The time adjustment is performed fully automatically.
Clock System Expansion	All connected and new clocks must be manually reset to 12:00, and then be restarted.	All existing clocks can continue to remain in operation and the new clocks are individually connected via “Plug and Play". Fully automatic time adjustment.
After Start-up	All clocks must be checked to ensure that they have been connected with the correct pole orientation. The time check process must be manually performed on each clock.	No time check required.
Wire Breakage	All clocks must be manually reset.	Fully automatic time correction.
Date Display	Digital date display must be manually set at start-up and the rechargeable battery be integrated.	Fully automatic adjustment and correction.

Cost Comparison

	Pulse Clock Pulse Counter with Alternating Polarity	IRIG-B / AFNOR Intelligent Clock Movement	NIS TELNU Intelligent Clock System
Acquisition Cost - Single Clock*	100	300 (external power supply)	100
Material Expense (Cable)*	100	200 (230 V connection)	100
Installation Time up to 10 clocks**	> 1 hour	< 10 minutes	< 10 minutes
up to 50 clocks	> 4 hours	< 10 minutes	< 10 minutes
> 100 clocks	> 8 hours	< 10 minutes	< 10 minutes
* Cost factor 100 = pulse clock
** Installation time includes the time needed to connect the clocks and the average time for clock readjustment and time checking. In the case of pulse clocks and IRIG-B or AFNOR, the installation time depends upon the qualification and experience of the service personnel.

Identical acquisition costs as with classic minute pulse-controlled indoor slave clocks up to 40 cm dial diameter, digital-clocks, outdoor-clocks as well as radio-controlled clocks. The significant price advantage of the TELNU system clocks with second hands was not even considered in making this comparison.

All commercially available intelligent slave clock systems such as IRIG-B or AFNOR are more expensive than classic minute pulse-controlled clocks or TELNU system clocks because, in addition, a 230 V external power supply is required for each clock which increases the total acquisition costs.