Allied Telesis SwitchBlade x3106 - Manual (Page 32)

Chapter 1: Overview
32
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 in all twenty slots in
the line card. You may install a combination of SFP and CSFP
transceivers.
Contact your Allied Telesis sales representative for the list of supported
transceivers.