Features:
- Two BFOC ports add 100 Mbit/s single-mode optical connections to an XR-300 switch.
- The module converts host-switch signals to and from 1310 nm fiber transmission.
- A latched media slot supplies the mechanical and electrical connection to the switch.
Separate transmit and receive fibers form each full-duplex optical path.
The receiving level depends on fiber loss, connector loss, splices, and total distance.
Host diagnostics identify the installed module and report the resulting port state.
The Siemens 6GK5991-2AC00-8AA0 SCALANCE MM991-2LD BFOC Media Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6GK5991-2AC00-8AA0 SCALANCE MM991-2LD Media Module Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Maintaining the transmit and receive directions of each link
- Transmit fiber: The local laser sends 1310 nm data toward the remote receiver.
- Receive fiber: The return strand delivers the partner signal to the local detector.
- Polarity: Each transmit connector must terminate at the opposite receive connector.
- Full duplex: Both strands operate together to provide simultaneous bidirectional traffic.
Matching the cable plant to long-distance single-mode optics
- Fiber medium: The LD optics require the documented single-mode glass fiber.
- Connector form: BFOC/ST terminations mate with the two optical ports.
- Loss sources: Connectors, splices, bends, and fiber length all consume optical budget.
- Medium boundary: POF and multimode assemblies are not substituted for the stated single-mode path.
Combining the plug-in module with its XR-300 switch
- Media slot: The module occupies a supported XR-300 expansion position.
- Backplane link: The host provides power, control, and switched frame data through the slot.
- Module identity: The switch detects the installed optical execution during startup.
- Port management: Configuration and diagnostics remain available through the host switch.
Separating module seating from optical-path faults
- Module state: Host recognition confirms that the media module is seated.
- Port indication: Link and activity LEDs show the state of each optical interface.
- Optical check: Power level and polarity isolate fiber-path problems.
- Remote partner: Both ends must use compatible rate, wavelength, and single-mode optics.