
6
6.2 Stand–Alone Type i Series Hardware
224
• Alarm LED display (red) when an alarm occurs
Board state
LEDB
ALM
Lit when a parity alarm occurs in the main memory on this
board.
• Communication status LED display (Only LEDA (COL) is red.)
(1) For Ethernet board
Communication status
LED5 (TX) Lights when data is received.
LED6 (RX) Lights when data is sent.
LEDA (COL) Lights if a data collision occurs.
(2) For fast Ethernet board
Communication status
COM Lights when data is sent or received.
LIL Lights when the Fast Ethernet is successfully connected to
the hub.
COL Lights if a data collision occurs.
BTX Lights when a connection is made with 100BASE–TX
NOTE
LIL : Communication is not performed while this LED is not lit. A probable
reason for this is that the fast Ethernet is not properly connected
to the hub, or that the hub is off. This LED should be lit at all times
while the fast Ethernet is properly connected to the hub.
LEDA, COL :
This LED lights frequently if there is excessive traffic on the com-
munication line or if there is excessive peripheral electrical noise.