Signal Control On Failures; (I) Loss Of Signal (Los) In C37.94; (Ii) Mux Operation When Los Being Detected - Toshiba GR 200 Series Instruction Manual

with each LED.
GIF200
Type LED Color
RX Green
TX Green
C37.94
CF Red
YAL Red
RX Green
Green
G.703 TX
CLK Green
DC PWR Green
†Note: If the CF is detected together with YAL at the same time, YAL is switched off
unconditionally.

Signal control on failures

Signal control is carried out when errors or failures occur in the communication. The following
cases are exemplified.
Loss of signal (LOS) in C37.94
(i)
If two or more errors are found in eight consecutive receive frames, an LOS (loss of signal)
command is issued within one millisecond in the GIF200 unit. The LOS command is cleared,
if erroneous data is not found in the last eight consecutive frames.
MUX operation when LOS being detected
(ii)
During LOS condition at its optical receive port, the GIF200 changes the "Yellow alarm bit" of
RX RX
TX TX
CF CLK
YAL PWR
Figure 2.5-1 Eight LED indicators on GIF200
Table 2.5-1 Meaning of LED indicators
Function
Data (not always '1 (level: high)') being received from IED.
Data (not always '1 (level: high)') being sent for the IED.
Loss of signal (LOS) or detection of the erroneous data
Detection of "Yellow alarm bit" in header of C37.94†
Data (not always '1 (level: high)') being received from MUX
Data (not always '1 (level: high)') being sent for MUX
LED instructs the CLK signal "1 (level: high)" being detected.
DC 5V generated in good order
- 4 -
LED
RX in C37.94
TX in C37.94
CF in C37.94
YAL in C37.94
6F2S1916 (0.5)
RX in G.703
TX in G.703
CLK in G.703
Power
GIF200