Allied Telesis AT-SBx81CFC960 - Manual (Page 221)

SwitchBlade x8106 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section II: Installing the Chassis 221
Twisted Pair Ports
This section applies to the twisted pair ports on the AT-SBx81GT24, AT-
SBx81GT40, and AT-SBx81GP24 Line Cards. To determine whether a
twisted pair port on one of the cards has established a link to a network
device, examine its L/A LED. The L/A LEDs for the ports on the AT-
SBx81GT24 and AT-SBx81GP24 Line Cards are illustrated in Figure 16
on page 40 and Figure 21 on page 45, respectively. The L/A LEDs for the
ports on the AT-SBx81GT40 Line Card are shown in Figure 19 on page
42.
A L/A LED is solid or flashing green when a port is 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 network device 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 network device.
 Make sure that the twisted pair cable does not exceed 100 m (328
ft).
 Verify that you are using the appropriate category of cable by
referring to Table 12 on page 54 for the AT-SBx81GT24 and AT-
SBx81GT40 Line Cards and Table 13 on page 54 for the AT-
SBx81GP24 Line Card.
 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 ports on the line
card and network device are compatible.
If the L/A LED for a port is on, signalling a link to the network device, but
performance is poor or intermittent, the problem may be from a bad cable.
Try replacing the cable.
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, AT-
SBx81GT40, and AT-SBx81GP24 Line Cards is Auto-Negotiation.
This setting is appropriate for ports connected to network devices
that also support Aut-Negotiation.