Allied Telesis AT-SBX81XS6 Guía de instalación descargar pdf (Pagina 212)

Chapter 11: Troubleshooting

212 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 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 the end node.

 Make sure that the twisted pair cable does not exceed 100 m (328

ft).

 Refer to Table 11 on page 52 and Table 12 on page 53 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.

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Allied Telesis AT-SBX81XS6 Guía de instalación Pagina 212