Allied Telesis SwitchBlade x3112 - Manual (Page 43)

SwitchBlade x3112 Installation Guide
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slot in the top row is port number 0 because it is the lower of the two port
numbers of the slot. To configure the transceiver, you have to specify port
0 in the management software. The switch marks the unused port number
of the slot, in this case port number 2, as masked or eclipsed to prevent
you from using it to manage the transceiver.
In contrast, an SFP module in a slot in the bottom row is assigned the
higher number of the slot’s two numbers. For instance, an SFP transceiver
installed in the first slot in the bottom row is assigned the port number 3 by
the switch. Port 1, the unused port number of the slot, is marked as
masked by the switch and cannot be used to configure the device.
Figure 19 illustrates the port numbers for the first four slots when they
contain standard SFP transceivers.
Figure 19. Port Numbers for Slots with Standard SFP Transceivers
Port 0 Port 4
Port 3 Port 7