Irig-B - GE N60 Instruction Manual

WIRING CHAPTER 3: INSTALLATION
Lightning strikes and ground surge currents can cause large momentary voltage differences between remote ends of the
communication link. For this reason, surge protection devices are provided internally at both communication ports. An
isolated power supply with an optocoupled data interface also acts to reduce noise coupling. To ensure maximum
reliability, ensure that all equipment has similar transient protection devices installed.
Terminate both ends of the RS485 circuit with an impedance as shown in the figure.
Figure 3-19: RS485 serial connection
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3.3.9.3 100Base-FX fiber optic ports
The fiber optic communication ports allow for fast and efficient communications between relays at 100 Mbps. Optical fiber
can be connected to the relay supporting a wavelength of 1310 nm in multimode.
Ensure that the dust covers are installed when the fiber is not in use. Dirty or scratched connectors can lead to high losses
on a fiber link.

3.3.10 IRIG-B

IRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices. The
IRIG-B code allows time accuracies of up to 100 ns. Using the IRIG-B input, the N60 operates an internal oscillator with 1 µs
resolution and accuracy. The IRIG time code formats are serial, width-modulated codes that can be either DC level shifted
or amplitude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipment can use a
global positioning system (GPS) satellite system to obtain the time reference so that devices at different geographic
locations can be synchronized.
3-20 N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL