An SFP module isn't a complete interface - it's just the last part of a physical-layer interface, forming the Physical Medium Dependent (PMD) sublayer between the Physical Medium Attachment (PMA) and the medium.
If output signal of SFP is electrical, how can it be connected via optical fibre?
As you've stated, a transceiver consists of a transmitter (e.g. ...
Switch: Cisco 2960G 24x 1G ports and 4x 10G SFP
SFP ports are 1G. 10G ports should be marked SFP+.
Running a 10G SFP+ module in an SFP slot is generally only possible when the module is explicitly marked 1G compatible and if the switch doesn't mind - most do.
no errdisable detect cause gbic-invalid
These commands disable the ...