Wombat is a passive pluggable device for QSFP56 extension. One hand is for plugging into a QSFP-DD/QSFP receptacle and the other hand is to accommodate the insertion of a QSFP56/28 transceiver. By reducing the number of matching, Wombat can effectively protect the connector of QSFP-DD/QSFP’s receptacle at any network equipment or test instrument. Wombat supports QSFP56/200GE and backward compatible with QSFP28/100GE, QSFP/40GE.