
Cabling
29
If a transceiver is installed on an AT-1720, the setting of the SQE
switch (heartbeat) is not important. Turning the SQE switch
OFF or ON will not result in degradation or failure of network
communication.
Communication Status Indicators
Table 6 shows the functions of the four status indicators located
below the RJ45 receptacle.
Table 6: AT-1720 Status Indicators
LED Color
Label
Indicates
Used by
Green
TX
Transmitting packet
All media
Yellow
RX
Receiving packet
All media
Green
LNK
Valid receive link signal
10BASE-T 10BASE-FL
FOIRL
Yellow
COL
Collision detected
All media