GE Multilin T60 Transformer Protection System 3-273 HARDWARE 3.2 WIRING3c) 10BASE-FL AND 100BASE-FX FIBER OPTIC PORTSENSURE THE DUST COVERS ARE INSTALLED WHEN THE FIBER IS NOT IN USE. DIRTY ORSCRATCHED CONNECTORS CAN LEAD TO HIGH LOSSES ON A FIBER LINK.The fiber optic communication ports allow for fast and efficient communications between relays at 10 Mbps or 100 Mbps.Optical fiber may be connected to the relay supporting a wavelength of 820 nm in multi-mode or 1310 nm in multi-modeand single-mode. The 10 Mbps rate is available for CPU modules 9G and 9H; 100Mbps is available for modules 9J, 9K, 9L,9M, and 9N. The 9H, 9K, and 9M modules have a second pair of identical optical fiber transmitter and receiver for redun-dancy.The optical fiber sizes supported include 50/125 μm, 62.5/125 μm and 100/140 μm for 10 Mbps. In order to engage or dis-engage the ST type connector, only a quarter turn of the coupling is required.3.2.10 IRIG-BIRIG-B is a standard time code format that allows stamping of events to be synchronized among connected devices. TheIRIG-B code allows time accuracies of up to 100 ns. Using the IRIG-B input, the T60 operates an internal oscillator with 1μs resolution and accuracy. The IRIG time code formats are serial, width-modulated codes that can be either DC levelshifted or amplitude modulated (AM). Third party equipment is available for generating the IRIG-B signal; this equipmentcan use a GPS satellite system to obtain the time reference so that devices at different geographic locations can be syn-chronized.Figure 3–27: OPTIONS FOR IRIG-B CONNECTIONNOTICEUR-series deviceBNC (in)ReceiverRG58/59 coaxial cableGPS satellite systemGPS connectionIRIG-B (–)4A+859716A1.CDRIRIG-Btime code generator(DC-shift oramplitude modulatedsignal can be used)4B IRIG-B (+)BNC (out) RepeaterTo other devices(DC-shift only)UR-series deviceBNC (in)ReceiverTwisted-pair cableGPS satellite systemGPS connectionIRIG-B (–)4A+IRIG-Btime code generator(DC-shift oramplitude modulatedsignal can be used)4B IRIG-B (+)BNC (out) RepeaterTo other devices(DC-shift only)
