Allied Telesis SwitchBlade x3112 - Manual (Page 203)

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.