GE Energy
Fiber Optic Connector Signal Definitions
Connector | Function |
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TX1 | Primary Fiber Optic Transmit Port |
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RX1 | Primary Fiber Optic Receive Port |
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TX2 | Hot Standby Secondary Fiber Optic Transmit Port |
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RX2 | Hot Standby Secondary Fiber Optic Receive Port |
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See section “3.9 Hot Standby Fiber Optic Ethernet Switch” for more information.
4.6IRIG-B Connections
The D400 uses a pair of IRIG-B adapter cards, the IRIG-B Input Adapter and the IRIG-B Distribution Adapter, to accept an IRIG-B signal from a GPS receiver then distribute the signal to connected IEDs.
See sections “3.6 IRIG-B Input Adapter” and “3.7 IRIG-B Distribution Adapter” for more information.
IRIG-B Input Adapter
The IRIG-B Input Adapter (GE Part No. 520-0211) 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
•Demodulated IRIG-B (TTL) through a terminal block
•Fiber Optic through a Receive (RX) 820-850 nm ST connector
The IRIG-B signal can be distributed to an attached IED through the fiber optic output (TX) on 820-850 nm ST connector.
When calculating cable length, consider the following optical power levels:
•Glass optical fiber transmitter power is –19.0 ± 2 dBm
•Glass optical fiber receiver sensitivity is typically –25.4 dBm
Warning: LED transmitters are classified as IEC 60825-1 Accessible Emission Limit (AEL) Class 1M. Class 1M devices are considered eye safe to the unaided eye. Do not view directly with optical instruments.
D400 Substation Data Manager User's Manual 55
