Most 1G SFP modules are fed with a 1000BASE-X data stream created by the PCS sublayer. A 1000BASE-T SFP module then has to transcode that -X to a four-lane -T signal.
Some host devices, especially NICs, instead use a lower-level SGMII signal (serial gigabit media-independent interface). xMII is an optional interface between the MAC and the PHY layer.
Rx_LOS is an SFP slot signal - quoting from Seagate's INF-8074i spec:
LOS (Loss of Signal) is an open collector/drain output, which should
be pulled up with a
4.7K – 10KΩ resistor. Pull up voltage between 2.0V and VccT, R+0.3V. When high, this output indicates the received optical power is below
the worst-case receiver sensitivity (as defined by the standard in
use). Low indicates normal operation. In the low state, the output
will be pulled to < 0.8V. 6) VeeR and VeeT may be internally connected
For an SFP module that options means that there's a real LOS signal presented to the host device, instead of simply pulling it low permanently.
Can't be sure, but judging from nothing of this being mentioned in the switch documentation, I'd guess you need a plain 1000BASE-T module. However, do make sure that 1000BASE-T is supported in that SFP slot. Not all devices do.
