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Chapter 2: Overview of the Ethernet Line Cards
Port Numbers
44
Note
The AT-SBx31GC40 Line Card does not support 10 or 100 Mbps
transceivers.
The AT-SBx31GC40 Line Card has twenty slots for standard SFP or
CSFP transceivers, and supports twenty or forty networking ports,
depending on the types of transceivers. The line card has twenty ports
when the slots have standard SFP transceivers, because each SFP
transceiver functions as one port. In contrast, the line card has forty ports
when the twenty slots have CSFP transceivers, because the two fiber
connectors on a CSFP transceiver function as independent, bidirectional
networking ports that can be connected to different network devices.
You do not have to install the same type of transceiver into all twenty slots
in the line card. You may install a combination of SFP and CSFP
transceivers.
Contact your Allied Telesis sales representative for a list of supported
transceivers.
The AT-SBx31GC40 Line Card has two port numbers for each transceiver
slot. The numbers are displayed on the front panel alongside and above
the slots in the top row and alongside and below the slots in the bottom
row. For instance, the first transceiver slot in the top row has the port
numbers 0 and 2 and the slot beneath it has the port numbers 1 and 3.
(The port numbers 2 and 4 are omitted from the first two slots in the top
row on the faceplate to allow for the model name.)
A transceiver uses either one or both port numbers of a slot, depending on
whether its a SFP or an CSFP transceiver. A CSFP transceiver is
assigned two port numbers because its two connectors function as
independent network connections. You may use the two port numbers of a
transceiver to configure the ports independently. The left-hand fiber
connector is assigned the lower number of a slot and the right-hand
connector is given the higher port number. For example, the left-hand fiber
connector of an CSFP transceiver in the first top slot is assigned the port
number 0 and the right-hand connector is given the port number 2.
Figure 21 on page 45 illustrates the port numbers for the first two slots
when they contain CSFP transceivers.
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