SM100MA-05 Copper Small Form Pluggable (SFP) transceivers are
based on the SFP Multi Source Agreement (MSA) . They are compatible
with the 10base-T / 100base-Tx standards as specified in IEEE Std 802.3.
SFP-100BASE-T uses the SFP's RX_LOS pin for link indication. If pull up
SFP's TX_DISABLE pin, SWITCH IC be reset.