Allied Telesis SwitchBlade x8112 - Manual (Page 193)

SwitchBlade x8112 Chassis Switch Installation Guide
193
Twisted Pair Ports
The ports on the AT-SBx81GT24 and AT-SBx81GP24 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 the L/A LEDs on the cards are off, try pressing the eco-friendly
button on the active master controller 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 33 and Table 2 on page 34 to verify the
appropriate categories of twisted-pair cables for the AT-
SBx81GT24 and AT-SBx81GP24 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.
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 “Cabling Guidelines for
the Twisted Pair Ports on the AT-SBx81GT24, AT-SBx81GT40, and AT-
SBx81GP24 Line Cards” on page 124.
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-SBx81GT24 and
AT-SBx81GP24 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.
 The ports must be set to Auto-Negotiation, the default setting, to
operate at 1000Mbps.