Single-mode Optical Module UACC-OM-SM-10G-D: Single-mode, duplex, ber transceiver module. The 10 Gbps Single-mode Optical Module is a duplex transceiver that delivers up to 10 Gbps speed over distances up to 10 kilometers. UACC-OM-SM-10G-S: Single-mode, simplex, ber transceiver module. The 10 Gbps Bidirectional Single-mode Optical Module is a simplex transceiver that delivers up to 10 Gbps speed over distances up to 10 kilometers. UACC-OM-SM-1G-S: Single-mode, simplex, ber transceiver module.