User manual

Cabling

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