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    The QSFP-40G-ESR4 is a 4-channel pluggable optical transceiver module for mid-range data communication and interconnects applications. The module contains four channels in each direction with 40 Gb/s aggregate bandwidth with each channel operating at up to 10 Gb/s at distances of up to 300 meters (984 ft.) using OM3 fiber and 400 meters on OM4 multimode fibers. The electrical interface uses a 38-contact edge type connector, compliant with SFF-8436. The optical interface uses a 12-fiber MPO connector.