Allied Telesis x530 Series Installation Manual page 119

Use the switch's management software to verify that the port is

enabled.
If the remote network device is a managed device, use its

management firmware to determine whether its port is enabled.
Test the attenuation of both directions on the fiber optic cable with

a fiber optic tester to determine whether the optical signal is too
weak (sensitivity) or too strong (maximum input power).
Problem 5: The SHOW STACK command is not displaying all the
switches in the stack.
Solutions: If you are using 10 Gbps ports for the stack trunk, try the
following:
Verify that the stacking ports are properly cabled. Refer to

AT-x530-28GPXm.
If you are using SFP+ transceivers for the stack trunk, verify that

they are fully inserted into the transceiver slots.
If you are using AT-SPI0TW direct connect twinax cables, verify

that they are from Allied Telesis. The trunk will not work with cables
from other network equipment manufacturers.
Verify that VCStack is activated on the switches. For instructions,

refer to "Verifying the Stack" on page 102.
Problem 6: The AT-x530-28GPXm switch is not providing power to a PoE
or PoE+ device.
Solutions: Try the following:
Review the powered device documentation to confirm that the

device 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 in the switch to the powered device. 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-x530-
28GPXm switch 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 the switch.
Use the SHOW SYSTEM ENVIRONMENT command to confirm

that both power supplies are operating normally. The switch might
not be able to support all powered devices if one of the power
supplies is powered off or has failed. For more information, refer to
"Power Budget" on page 29.
x530 Series Installation Guide for Virtual Chassis Stacking
119