Black Box COMPACT T1 MT850A - Manual (Page 473)

Compact T1 - Release 6.1 13-17
Router (IP) Card
LEDs
LEDs
The following chart describes each LED, and it’s state, of the Router card.
LED State Description
CRD Off Loss of power
Green No current alarms
Red Alarm state active. See alarm log for cause
Red Flashing Self-test or Boot in-process
Yellow Flashing Card is saving data to flash RAM, do not
power down
10/100 Off 10 Mb ethernet
Green 100 Mb ethernet
LNK Off No ethernet link
Green Good ethernet link
COL
Off No current ethernet transmit collisions
Yellow Ethernet collisions have occurred and
have not dropped to minimum level
Yellow Flashing Ethernet collision occurring
TX Off No ethernet transmit activity
Green Ethernet transmit activity
RX Off No current ethernet receive activity
Green Current ethernet receive activity