SwitchBlade x3112 Installation Guide
Link LED is Off on AT-SBx31GP24 PoE Line Card
Under normal operating conditions for a port with an active LINK status, the LINK LED for each port is either solid GREEN or AMBER, or it is flashing GREEN or AMBER. Refer to “Port LEDs on the AT-SBx31GP24 PoE Line Card” on page 32 for the LINK LED location and Table 7 on page 32 for the LINK LED description. If a Link LED is off, do the following:
Verify that the end node connected to the port is powered ON and is operating properly.
Check that the twisted-pair cable is securely connected to the port on the switch and to the port on the end node.
Make sure that the twisted-pair cable does not exceed 100 m (328 ft).
Verify that you are using the appropriate category of twisted-pair cable: Category 3 or better for 10 Mbps operation, Category 5/5E for 100 Mbps 1000 Mbps and Category 6/6E for 10GBASE-T operations.
Determine if a crossover cable is required. Since the twisted-pair ports feature auto MDI/MDI-X, you should be able to use a straight-through cable regardless of the type of device you connect to a port. However, if you disable auto-negotiation on a port and set a port’s speed and duplex mode manually, the port defaults to MDI-X.
Verify that the twisted-pair cable is not faulty by replacing it with a known good cable
Make sure that the operating parameters of the port on the switch are compatible with the end node to which the port is connected. This may require that you use the Switchblade x3112 Management Software.
