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SwitchBlade x3112 Installation Guide
203
Twisted Pair Ports
The ports on the AT-SBx31GT24 and AT-SBx31GP24 Line Cards have
L/A LEDs that are solid or flashing green when the ports are operating at
1000 Mbps, and solid or flashing amber at 10 or 100 Mbps. If a port is
cabled to a network device but the L/A LED is off, try the following:
If all of the L/A LEDs on the card are off, try pressing the eco-
friendly button on the active master control card to verify that the
LEDs on the line cards are on.
Verify that the end node connected to the port is powered on and
operating properly.
Check that the twisted pair cable is securely connected to the ports
on the line card and the end node.
Make sure that the twisted pair cable does not exceed 100 m (328
ft).
Refer to Table 1 on page 36 and Table 2 on page 37 to verify the
appropriate categories of twisted-pair cables for the AT-
SBx31GT24 and AT-SBx31GP24 Line Cards, respectively.
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 line
card and the parameters of the end node are compatible.
Use the SHOW INTERFACE and ENABLE INTERFACE
commands to be sure that the port is enabled.
If the L/A LED for a port is green, signalling a link to the network device,
but link performance is poor or intermittent, the problem may be from a
bad cable. Try replacing the cable, as explained in “Guidelines to Cabling
the AT-SBx31GP24, AT-SBx31GT24, and AT-SBx31GT40 Line Cards” on
page 128.
Another source of poor or intermittent performance on a link can be a
speed or duplex mode mismatch between a port and network device. Here
are some items to consider when resolving this type of problem:
The default speed setting for the ports on the AT-SBx31GT24 and
AT-SBx31GP24 Line Cards is Auto-Negotiation. This setting is
appropriate for ports connected to network devices that also
support Aut-Negotiation.
The default speed setting of Auto-Negotiation is not appropriate for
ports connected to network devices that do not support Auto-
Negotiation and have fixed speeds or 10 or 100 Mbps. For those
switch ports, you should disable Auto-Negotiation and set the
port’s speed manually to match the speeds of the network devices.