The TM-D4GSFP transponder is part of the LambdaDriver product line and
can be hosted by the LD400, LD800 and LD1600 chassis.

The transponders are single slot modules that interface between the DWDM
multiplexers and the terminal equipment. These modules provide light
paths at ITU-T grid DWDM wavelength, which can carry Fibre Channel 4.