AudioCodes Mediant 800B SFP Fast Ethernet Module – BX10-D Downstream Single-Fiber BiDi Transceiver (M800B/SFP-FE-BX10-D)

The AudioCodes M800B/SFP-FE-BX10-D is a Fast Ethernet BiDi (bidirectional) SFP transceiver for the Mediant 800B SBC gateway. Operating at 100Mbps over a single fiber strand using wavelength-division multiplexing (WDM), it transmits at 1550nm and receives at 1310nm — the downstream direction. It must be paired with the M800B/SFP-FE-BX10-U (upstream) at the far end to complete a full-duplex single-fiber Fast Ethernet link with a 10km reach.

The Telecom Spot Take

BiDi SFP transceivers are the solution when you need fiber connectivity but have only a single strand available — common in older structured cabling installations, long cable runs where fiber pairs were split, or environments where fiber scarcity drives single-strand design. The BX10-D/U pair creates a full-duplex 100Mbps Fast Ethernet link over one fiber at up to 10km. Always order the downstream (D) and upstream (U) variants together — one end gets the D, the other gets the U. The M800B/SFP-FE-BX10-D fits the Mediant 800B's SFP interface slots, enabling fiber WAN connectivity where copper Ethernet won't reach.

Key Features

• 100Mbps Fast Ethernet BiDi — full-duplex link over a single fiber strand using WDM technology
• Downstream direction — 1550nm TX / 1310nm RX; pair with BX10-U at the far end
• 10km single-fiber reach — connects Mediant 800B to remote network equipment over existing single-strand fiber
• Mediant 800B SFP slot compatible — installs directly into the Mediant 800B's SFP interface bay
• Single-fiber efficiency — eliminates the need for a second fiber strand for return traffic

Technical Specifications