Allied Telesis AT-SBx81CFC960, Руководство по установке

Страница: 222 / 324

Chapter 11: Troubleshooting
222 Section II: Installing the Chassis
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 12
on page 38 and Figure 17 on page 43, respectively. The L/A LEDs for the
ports on the AT-SBx81GT40 Line Card are shown in Figure 15 on page
40.
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 the end node.
 Make sure that the twisted pair cable does not exceed 100 m (328
ft).

Refer to Table 12 on page 52 and Table 13 on page 52 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 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
link 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 and
AT-SBx81GP24 Line Cards is Auto-Negotiation. This setting is
appropriate for ports connected to network devices that also
support Aut-Negotiation.