Allied Telesis Switch AT-SBXPWRSYS1 User Manual download pdf (Page 205)

SwitchBlade x3112 Installation Guide

205

Power Over Ethernet

This section applies only to the AT-SBx31GP24 Line Card. Each port on

the line card has two LEDs. The left LED provides port link and activity

status and the right LED provides PoE status information. The PoE LED is

solid green when a port is delivering power to a powered device (PD). The

PoE LED of a port that is not delivering power will be flashing amber,

steady amber, or off. If a powered device is not receiving power from a

port on the line card, try the following:

 If all the L/A LEDs on the line cards in the chassis are off, try

pressing the eco-friendly button on the active master control card

to turn on the LEDs.

 Check to be sure that the chassis has at least one AT-

SBxPWRPOE1 Power Supply and that the unit is operating

properly. The AC and DC LEDs should be solid green and the

Fault LED should be off. For troubleshooting suggestions, refer to

“AT-SBxPWRSYS1 and AT-SBxPWRPOE1 AC Power Supplies”

on page 198.

 Review the PD’s documentation to confirm that it supports Mode A

of the IEEE 802.3at standard. Mode A is one of two modes that

define the connector pins that deliver the power from the port on

the line card to the PD. In Mode A, the power is carried on pins 1,

2, 3, and 6 on the RJ-45 port, the same pins that carry the network

traffic. The second mode, Mode B, defines pins 4, 5, 7, and 8 as

the power carriers. The AT-SBx31GP24 Line Card does not

support Mode B. Most powered devices are designed to accept

power by either mode, but some legacy devices may only support

one mode. This can be verified by reviewing the device’s

documentation or data sheet. Legacy devices that only support

Mode B will not work with this line card.

 Check that the device’s power requirements do not exceed 30 W.

This can be verified by reviewing the device’s documentation or

data sheet.

 Verify that you are using the appropriate category of twisted-pair

cable by referring to Table 2 on page 37.

 Try replacing the twisted-pair cable, as explained in “Guidelines to

Cabling the AT-SBx31GP24, AT-SBx31GT24, and AT-SBx31GT40

Line Cards” on page 128.

 Use the SHOW POE INTERFACE command in the management

software to determine whether PoE is enabled on the port. The

default setting for PoE is enabled.

 Use the SHOW POE INTERFACE command to determine whether

the PoE power setting for the port has been reduced to a value

below the power requirements of the device.

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Allied Telesis Switch AT-SBXPWRSYS1 User Manual Page 205

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