44 GE INFORMATION D400 SUBSTATION GATEWAY INSTRUCTION MANUAL
CHAPTER 3: SETTING UP COMMUNICATION CARDS
Figure 20: Glass Optical Fiber Serial Adapter
Figure 21: Plastic Optical Fiber Serial Adapter
IRIG-B input adapter
The IRIG-B Input Adapter (GE part number 520-0211LF) plugs into a dedicated IRIG-B slot
(slot 9) on the D400. The IRIG-B Input card accepts an IRIG-B signal in one of three input
formats through a corresponding connector type:
• Modulated IRIG-B through a BNC connector J2
AM modulated input accepts B12X, however, the SBS (straight binary seconds) in B120,
B124, and B127 are decoded but not used to set the time
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