Allied Telesis AT-8550SP - Manual (Page 73)

AT-8500 Series Fast Ethernet Switch Installation Guide
73
For twisted pair ports, verify that the LINK LED for each port is ON. 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 and Category 5
and Category 5E for 100 Mbps and 1000 Mbps 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. For port pinouts, refer to RJ-45 Twisted Pair Port
Pinouts on page 83.
‰ 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 switch’s management software.
For instructions, refer to the AT-S62 Management Software
User’s Guide or the AT-S62 Command Line User’s Guide.
For fiber optic ports, verify that the LINK LED for each port is ON. 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 fiber optic cable is securely connected to the port
on the switch and to the port on the end node.
‰ Dual SC ports consist of two separate connectors, as shown in
Figure 21 on page 62. Each connects to a separate fiber strand.
One is for receiving data and the other is for transmitting data.
When connecting a fiber optic cable to an SC port, be sure that the
receiver fiber connector is connected to the transmitter
connector on the remote end node, and the transmitter fiber
connector is connected to the receiver connector on the remote
node.