Electrical/Optical Time Input; Selecting The Type Of Time Input; Figure 8: Rt412 Grounding Strap; Figure 9: Electrical/Optical Time Input - GE Reason RT412 Technical Manual

Chapter 4 – Installation

Electrical/Optical Time Input

Selecting the Type of Time Input

RT412
The RT412 has one optical input and one electrical input for time reference. Both
accepts IRIG-B00X, PPX, DCF77, or any signal with frequency up to 5 MHz. The electrical
input support up to 5 Vdc signals.
Note the time accuracy of RT412 depends on the time reference source.
To synchronize the RT412 using optical fiber, adequate optical fiber should be used,
respecting a minimum bend radius of 30 mm. To synchronize the equipment using the
electrical input, it is recommended the use of twisted pair.
For distances over 3 m, the use of an optical fiber cable is recommended to minimize
the effects related to EMC.
The length of the optical fiber cables should not exceed 2 km.
An electrical jumper allows selecting the input to be used as time reference. The
electrical time reference port is enabled when making the jumper connection. In case
the jumper is disconnected, the equipment operates using the optical time reference
port insulated.

Figure 8: RT412 Grounding Strap

Figure 9: Electrical/Optical Time Input

RT412
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