CHAPTER 3: INSTALLATION
DIRECT INPUT AND OUTPUT COMMUNICATIONS
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
3-49
3
Figure 3-57: Status LEDs
The clock configuration LED status is as follows:
•
Flashing green — loop timing mode while receiving a valid data packet
•
Flashing yellow — internal mode while receiving a valid data packet
•
Solid red — (switch to) internal timing mode while not receiving a valid data packet
The link/activity LED status is as follows:
•
Flashing green — FPGA is receiving a valid data packet
•
Solid yellow — FPGA is receiving a "yellow bit" and remains yellow for each "yellow bit"
•
Solid red — FPGA is not receiving a valid packet or the packet received is invalid
3.4.9 C37.94SM interface
The UR-series C37.94SM communication modules (2A and 2B) are designed to interface with modified IEEE C37.94
compliant digital multiplexers or IEEE C37.94 compliant interface converters that have been converted from 820 nm multi-
mode fiber optics to 1300 nm ELED single-mode fiber optics. The IEEE C37.94 standard defines a point-to-point optical link
for synchronous data between a multiplexer and a teleprotection device. This data is typically 64 kbps, but the standard
provides for speeds up to 64
n
kbps, where
n
= 1, 2,…, 12. The UR-series C37.94SM communication module is 64 kbps only
with
n
fixed at 1. The frame is a valid ITU-recommended G.704 pattern from the standpoint of framing and data rate. The
frame is 256 bits and is repeated at a frame rate of 8000 Hz, with a resultant bit rate of 2048 kbps.
The specifications for the module are as follows:
•
Emulated IEEE standard — Emulates C37.94 for 1
×
64 kbps optical fiber interface (modules set to
n
= 1 or 64 kbps)
•
Fiber-optic cable type — 9/125
μ
m core diameter optical fiber
•
Fiber-optic mode — Single-mode, ELED compatible with HP HFBR-1315T transmitter and HP HFBR-2316T receiver
•
Fiber-optic cable length — Up to 11.4 km
•
Fiber-optic connector — Type ST
•
Wavelength — 1300 ±40 nm
•
Connection — As per all fiber-optic connections, a Tx-to-Rx connection is required
Summary of Contents for b30
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Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
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