SCALANCE X MM991-2LD Media Module
Siemens 6GK5991-2AC00-8AA0 is a SCALANCE X accessory identified as the MM991-2LD optical media module. It equips a compatible SCALANCE X switch with two 100 Mbit/s BFOC optical ports for single-mode fiber links reaching up to 26 km. The module is intended for industrial Ethernet network expansion where long-distance fiber transmission and electrical isolation are required. Procurement review should verify the complete article number, the host switch and available media-module slot, BFOC connector format, single-mode fiber specification, optical link budget, network topology and the lifecycle implications before replacement or project extension.
| Product Condition | Original new |
| Availability | In stock |
| Official Lifecycle | PM400: Announcement of product phase-out; product phase-out since 30.12.2023 |
| Warranty | With 1 year warranty |
| Shipping | Worldwide shipping options available |
Condition, availability and warranty are Stockoems commercial information, not manufacturer commitments.
| Manufacturer | Siemens |
| Complete Part Number | 6GK5991-2AC00-8AA0 |
| Product Designation | SCALANCE X MM991-2LD |
| Product Type | Optical media module |
| Number of Ports | 2 |
| Transfer Rate | 100 Mbit/s per port |
| Optical Connector | BFOC |
| Fiber Type | Single-mode optical fiber |
| Maximum Link Distance | 26 km |
| Official Lifecycle | PM400: Announcement of product phase-out |
| Phase-out Date | 30.12.2023 |
| Net Weight | 0.140 kg |
| Packaging Dimensions | 14 x 57 x 9 mm |
| EAN | 4019169207683 |
| Country of Origin | GERMANY |
| System Fit | Compatible SCALANCE X switches with the required MM991 media-module slot |
| System Role | Adds two long-distance 100 Mbit/s optical Industrial Ethernet interfaces |
| Typical Applications | Plant backbone links, building-to-building connections and electrically isolated industrial network segments |
| Optical Network | Single-mode fiber with BFOC connectivity, up to 26 km under the specified link conditions |
| Procurement Check | Verify complete suffix, host switch, slot type, BFOC connectors, fiber specification, optical budget and topology |
Match the complete 6GK5991-2AC00-8AA0 article number with the installed module and switch documentation. Confirm the host SCALANCE X model, supported media-module slot, hardware and firmware release, two-port requirement, BFOC connector condition, single-mode fiber type, attenuation budget, link distance, network redundancy design, mounting position and label photographs. A similar MM991 or SFP product may use different connectors, fiber types or optical ranges and should not be treated as a direct replacement without engineering review.
Siemens lists 6GK5991-2AC00-8AA0 as PM400: Announcement of product phase-out, with product phase-out since 30.12.2023. This wording is retained from the manufacturer record and should not be replaced with a different lifecycle classification. Maintenance planning should consider exact module availability and verify host-switch, fiber and connector requirements.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
Documentation-led support for 6GK5991-2AC00-8AA0 inspection, compatibility review, logistics and after-sales coordination.
| 1. Model and suffix verification | The complete Siemens article number, suffix and available label information are compared before order review. |
| 2. Condition confirmation | Supply condition, included items, BFOC ports and available inspection evidence are documented. |
| 3. Technical compatibility review | Host switch, media-module slot, fiber type, optical range, hardware and firmware are checked against buyer documentation. |
| 4. Product and label photo confirmation | Module, Siemens label, optical ports, packaging and condition photographs can be coordinated. |
| 5. Protective packaging and shipping | Protective packaging, worldwide shipping options, shipment tracking and customs documentation are coordinated after review. |
| 6. Warranty and after-sales | Written warranty terms, return authorization steps and after-sales response channels are documented. |
Our service process combines order-code verification, label inspection, technical-document comparison, condition review, protective packaging, logistics coordination, tracking, customs paperwork and responsive after-sales communication. Availability and delivery timing are confirmed only after the order review. No unverified stock quantity, dispatch date or automatic compatibility claim is made.
Look for complete model verification, traceable quotations, clear condition statements, label photographs, written warranty terms, a defined return process and responsive technical communication.
Review the exact order code, quotation, condition statement, inspection photographs, packing scope, warranty terms, shipping documents, customs information and return authorization procedure.
Match the suffix, host switch, module slot, firmware, BFOC interfaces, single-mode fiber, optical budget and network topology against project documentation.
Incomplete model numbers, refusal to provide nameplate photographs, conflicting specifications, unclear condition, unsupported compatibility claims and no explained return process are warning signs.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
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Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
