Irig-B - GE UR Series B30 Instruction Manual

3 HARDWARE
c) 10BASE-FL AND 100BASE-FX FIBER OPTIC PORTS
ENSURE 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.
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-mode
and 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.
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 B30 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 GPS satellite system to obtain the time reference so that devices at different geographic locations can be syn-
chronized.
GE Multilin
Figure 3–27: OPTIONS FOR IRIG-B CONNECTION
B30 Bus Differential System
3.2 WIRING
3

3.2.10 IRIG-B

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