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6GK5991-2AC00-8AA0

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As a SCALANCE MM991-2LD BFOC media module, Siemens 6GK5991-2AC00-8AA0 adds two long-distance single-mode fiber ports to a supported XR-300 switch.
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Technical specifications for 6GK5991-2AC00-8AA0

  • Manufacturer:
    Siemens
  • Part Number:
    6GK5991-2AC00-8AA0
  • Product Family:
    Siemens SCALANCE
  • Product Type:
    SCALANCE MM991-2LD BFOC Media Module
  • Stock:
    1
  • Module Designation:
    MM991-2LD BFOC
  • Host System:
    SCALANCE XR-300
  • Optical Ports:
    2 BFOC/ST interfaces
  • Transmission Rate:
    100 Mbit/s
  • Fiber Type:
    Single-mode glass fiber
  • Optical Wavelength:
    1310 nm
  • Maximum Link Length:
    26 km
  • Transmitter Output:
    -15 to -8 dBm
  • Maximum Receiver Input:
    -3 dBm
  • Receiver Sensitivity:
    -34 dBm
  • Mounting Method:
    Latched media-module slot
  • Protection Rating:
    IP20
  • Operating Temperature:
    -40 to 70 °C
  • Storage and Transport Temperature:
    -40 to 85 °C
  • Weight:
    0.1764 lbs (0.08 kg)
  • Estimated shipping dimensions:
    6x2.2x10cm
  • Tariff Code:
    85176200
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Optical Signal Path Fiber Selection Host Integration Link Diagnosis

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.
Description
Siemens 6GK5991-2AC00-8AA0 is the SCALANCE MM991-2LD plug-in media module that adds two 100 Mbit/s BFOC single-mode optical ports to a supported XR-300 switch. The host switch supplies power and switching logic, while the module performs the electrical-to-optical conversion for each installed fiber link.

Through its pair of BFOC interfaces, 6GK5991-2AC00-8AA0 launches and receives 1310 nm light on separate transmit and receive fibers. Correct polarity connects each transmitter to the remote receiver, and the total attenuation must remain inside the stated optical budget.

The long-distance optics of 6GK5991-2AC00-8AA0 are specified for single-mode glass fiber rather than POF or multimode cabling. Fiber type, connector condition, splice loss, and link length therefore determine whether the receiving level remains above sensitivity without overloading the input.

Installation of 6GK5991-2AC00-8AA0 is completed by latching it into the intended XR-300 media-module slot with the host equipment de-energized. After startup, port LEDs and switch diagnostics are used together to distinguish a seating problem from an optical-path fault.
Alternative Names
6GK59912AC008AA0 6GK5 991-2AC00-8AA0 6GK5991 2AC00 8AA0 Siemens 6GK5991-2AC00-8AA0 6GK5991-2AC00-8AA0 MM991-2LD 6GK5991-2ACO0-8AA0 6GK5991-2AC00-8AAO 6GK 5991 2AC00 8AA0
Technical notes
Seat Siemens 6GK5991-2AC00-8AA0 in the supported XR-300 media slot, then verify single-mode fiber type, BFOC polarity, attenuation, and optical budget.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why is there no optical link after installing Siemens 6GK5991-2AC00-8AA0?
Confirm Siemens 6GK5991-2AC00-8AA0 host recognition, BFOC seating, transmit-to-receive polarity, single-mode fiber, and remote-port compatibility.
Which fiber medium should be connected to 6GK5991-2AC00-8AA0?
Use the documented single-mode glass fiber with BFOC/ST terminations for 6GK5991-2AC00-8AA0, not POF or multimode cable.
How is the 26 km limit of Siemens 6GK5991-2AC00-8AA0 evaluated?
For Siemens 6GK5991-2AC00-8AA0, confirm that fiber, connector, and splice losses keep the received level inside the optical budget over the complete route.
Can 6GK5991-2AC00-8AA0 operate outside a SCALANCE XR-300 host?
No independent operation is documented; 6GK5991-2AC00-8AA0 depends on a supported XR-300 media slot for power, control, and frame transfer.
What should be inspected before moving 6GK5991-2AC00-8AA0 to another slot?
De-energize the host and check the 6GK5991-2AC00-8AA0 slot support, latch, connector condition, fiber labels, and switch configuration.