Gigabit multimode fibre connectivity
MikroTik S-85DLC05D in Dubai, UAE
The S-85DLC05D is a 1.25G SFP transceiver for short-range multimode fibre links. It provides an 850 nm dual-LC optical interface, supports Digital Diagnostics Monitoring and is specified by MikroTik for distances up to 550 metres when the fibre type, cable quality and complete link design are appropriate.
Confirm the complete fibre link
Share the two endpoint models, fibre grade, connector type, approximate distance and quantity. FourTeck can help check whether this is the correct optical module before quotation.
SFP, 1.25G data rate
Multimode, 850 nm
Dual LC UPC
Up to 550 m, link dependent
DDM supported
Direct answer for buyers
The MikroTik S-85DLC05D is an optical SFP module intended for Gigabit networking over multimode fibre. It is mainly used to connect compatible switches, routers and other devices with 1G SFP cages across distances that are unsuitable or inconvenient for standard copper Ethernet. It is a practical option for business sites with existing LC-terminated multimode fibre, including building backbones, equipment-room links and campus connections. Before proceeding, confirm the SFP capability of both endpoints, the installed fibre type and grade, the link length, connector cleanliness, polarity and whether Digital Diagnostics Monitoring is supported by the host equipment.
What the S-85DLC05D does
This module converts the electrical interface presented by a compatible SFP cage into an optical signal suitable for multimode fibre. A matching optical path at the far end converts the signal back into the electrical interface required by the remote switch, router or media platform. In practical terms, it allows a network designer to extend a Gigabit connection beyond the usual copper cabling limit or to use fibre where electrical isolation, pathway constraints or structured-cabling policy make optical media preferable.
The module itself does not route traffic, apply security rules or increase the forwarding capacity of a host device. Those functions remain the responsibility of the connected equipment. The SFP is one part of a complete link that also includes the host ports, a suitable module at each end, LC duplex patching, the installed multimode fibre, correct polarity, clean connectors and compatible speed settings.
Who should consider it
The product may fit organisations that already use multimode fibre or are planning a short optical backbone. Typical buyers include IT departments connecting access and distribution switches, system integrators preparing a bill of materials, facilities teams linking floors or buildings, service providers extending management or customer networks, and procurement teams replacing a failed or missing SFP with a verified model.
It is not the right selection for every fibre link. Buyers using single-mode cabling, bidirectional single-fibre designs, distances beyond the supported multimode reach, or 10 Gigabit throughput should evaluate another optic. A 10G SFP+ requirement, for example, needs a module and host interface designed for that speed rather than this 1.25G SFP.
Business challenges this optical module can address
Distance beyond copper Ethernet
A properly designed multimode fibre link can connect network points separated by more than the conventional horizontal-copper limit. The actual achievable reach depends on the complete optical path and cable grade, so the stated 550-metre capability should be evaluated against the installed infrastructure.
Building-to-building connectivity
Fibre is commonly considered where separate buildings, risers or equipment areas need a network link and copper is unsuitable. The transceiver can form part of that design when both endpoints support compatible 1G SFP operation and the fibre run is multimode.
Using existing LC multimode infrastructure
Sites with an existing duplex-LC multimode plant may be able to reuse that cabling after testing and inspection. Fibre condition, connector quality, patch-panel mapping and polarity should be confirmed before assuming that an installed path will support the planned service.
Optical health visibility
DDM can expose diagnostics such as optical operating information when the host device and software present those values. It can help technical teams investigate weak receive levels or abnormal module conditions, but it does not replace physical inspection and certified fibre testing.
Product-fit decision matrix
| Requirement | Suitable when | Confirm before ordering |
|---|---|---|
| Gigabit optical link | Both endpoints provide compatible 1G SFP cages. | Host port speed support, firmware and vendor interoperability. |
| Multimode fibre | The cable plant is verified as multimode with duplex LC connectivity. | Fibre grade, connector type, patching and optical loss. |
| Short-range backbone | The complete path is within the supported reach. | Measured route length and loss budget, not only map distance. |
| Cross-vendor connection | Both hosts accept compatible standards-based 1G multimode optics. | Vendor coding rules, support policy and speed configuration. |
| Diagnostics requirement | DDM values are useful to the operations team. | Whether the host displays and logs diagnostic information. |
Verified product information
The following values are based on the exact MikroTik S-85DLC05D product listing. Compatibility still depends on the host equipment, software, fibre plant and remote endpoint.
| Brand | MikroTik |
|---|---|
| Product name | S-85DLC05D |
| Product type | 1.25G SFP optical transceiver |
| Connector | Dual LC UPC |
| Data rate | 1.25G |
| Fibre mode | Multimode |
| Wavelength | 850 nm |
| Maximum stated distance | Up to 550 metres, subject to link design and fibre conditions |
| Diagnostics | DDM supported |
| Tested ambient temperature | -40°C to +85°C |
| MTBF guidance | Approximately 100,000 hours at 25°C |
| Host compatibility | Designed for suitable 1G SFP cages; exact device and firmware compatibility should be confirmed |
| Availability and warranty | Contact FourTeck for current UAE options and applicable quotation terms |
Compatibility and dependency notice
An SFP link is a system, not a standalone purchase. The module must be accepted by the local host, and the far-end optic must use a compatible speed, wavelength, fibre mode and connector arrangement. The S-85DLC05D is for multimode fibre; it should not be paired with a single-mode optic simply because both modules use LC connectors. Connector shape alone does not establish optical compatibility.
Some devices with SFP+ cages can operate 1G SFP modules, while others may require particular configuration or may not support every module. Conversely, an SFP cage does not become a 10G interface by inserting an SFP+ module. Review the host device documentation, interface compatibility information and current firmware before deployment. Cross-vendor use may work where both systems accept the optic, but vendor support policies can vary.
The maximum distance is not a promise for every cable path. Splices, adapters, dirty connectors, tight bends, patch leads, fibre grade and ageing infrastructure all contribute to optical loss. For business-critical links, inspect and test the path before commissioning and retain the test results with the network documentation.
Purchase and deployment journey
Identify both endpoints
Record the exact switch, router or appliance models at each end, including the interface type and current software version.
Validate the fibre plant
Confirm multimode fibre, duplex LC termination, route length, patch-panel mapping, connector cleanliness and test status.
Prepare the bill of materials
Include the correct number of optics, suitable patch cords, cleaning tools, labelling items and any required spare modules.
Install and verify
Insert the modules carefully, clean and connect the fibre, verify link state and review errors, speed and diagnostics.
Document the link
Record module serial details, port assignments, fibre route, test values and replacement procedure for support teams.
Reliable 1G optical connectivity depends on the complete path
The practical value of the S-85DLC05D is its role in a correctly engineered Gigabit fibre link. A buyer may focus first on the module, but successful operation depends equally on the transceiver at the remote end, the host port configuration and the optical characteristics of the installed cabling. A module can be fully functional and still show no link when polarity is reversed, the wrong fibre type is used, the remote optic operates at a different wavelength or the host interface is set incorrectly.
For new deployments, it is useful to treat the optical pair and patching as one bill-of-material item. Specify the same service speed, compatible optical standard and appropriate connector arrangement at both ends. Where a third-party switch or converter is involved, confirm whether it accepts non-vendor-coded modules. This avoids discovering after installation that the hardware restricts unsupported optics or requires a command to permit them.
For existing infrastructure, do not rely only on labels attached years earlier. Check the fibre using appropriate test equipment, verify the actual route and inspect end faces. A small amount of contamination can create disproportionate loss in an optical system. Good cleaning practice and protective caps are inexpensive compared with troubleshooting intermittent production links.
DDM supports troubleshooting and operational visibility
Digital Diagnostics Monitoring can provide additional operational information through a compatible host. Depending on the equipment and software, administrators may be able to view temperature, voltage, transmit power and receive power. These values are useful when comparing a healthy link with one that is marginal, when assessing whether optical loss has increased or when checking whether a module is operating outside expected conditions.
DDM should be used as one troubleshooting input rather than a substitute for fibre certification. A host may display limited values, report them differently or omit them entirely. A reading can also look acceptable at one moment while intermittent errors are caused by vibration, bend stress, a loose adapter or contamination. Review interface error counters, event logs and traffic behaviour alongside the diagnostic values.
Operations teams can improve support outcomes by documenting baseline optical values after commissioning. When an incident occurs later, those baselines provide context. The team can compare current receive levels and error counters with the original state, isolate changes and decide whether the issue belongs to the optic, host port, patching or backbone cable.
A compact component with important procurement details
Optical modules are small, but incorrect ordering can delay an otherwise simple network project. Procurement should request the exact model code rather than a generic description such as “MikroTik fibre module.” MikroTik offers several optics for different distances, fibre types and data rates. The S-85DLC05D specifically refers to a 1.25G, 850 nm, dual-LC multimode module with a stated reach of up to 550 metres.
Quantity planning should include the number of active endpoints and any resilience strategy. A single fibre link normally requires an optic at each end unless one side already has a suitable module. Sites with critical services may also keep an appropriate tested spare, but the spare policy should match the organisation’s support model and failure tolerance. Patch leads should be ordered separately where required, with the correct fibre grade, connector polish and length.
Commercial details such as current availability, lead time, warranty handling and delivery arrangements can change. They should be confirmed in the quotation rather than inferred from a manufacturer’s suggested price or an overseas listing. FourTeck can help align the requested product, quantity and supporting items with the planned deployment in Dubai or elsewhere in the UAE.
Ideal business environments and use cases
Office and campus backbones
Connect access and distribution equipment across floors, communications rooms or nearby buildings where the existing backbone is multimode fibre and the required service is 1G.
Retail and hospitality sites
Link network cabinets across larger premises, subject to verified pathways, appropriate containment and a tested optical plant.
Service-provider infrastructure
Use inside managed network environments where short multimode runs connect suitable aggregation, access or customer-edge equipment.
Equipment-room interconnects
Create optical links between racks, cabinets or rooms where electrical separation, pathway design or cable-management policy favours fibre.
Replacement and standardisation
Replace a known S-85DLC05D or standardise compatible short-range 1G links after validating each host and fibre path.
Lab and staging networks
Test configurations, interoperability and diagnostics before a field deployment, especially when multiple hardware vendors are involved.
Integration and operational considerations
Installation should follow the host equipment’s guidance. Protect the optical connector from dust, avoid touching the ferrule end face, and use approved cleaning materials before connection. Keep protective caps in place until the module and patch cord are ready to be connected. Do not look into optical ports or fibre ends. Network teams should follow their organisation’s laser-safety and handling procedures even for short-range optical systems.
Check polarity when the link remains down. Duplex fibre requires transmit at one end to reach receive at the other. Patch panels and intermediate adapters can introduce a polarity reversal or an unexpected mapping. Also confirm that the device recognises the module, the interface is enabled and the selected speed is appropriate. On devices with combination ports, verify whether the copper and optical interfaces are mutually exclusive or require a particular mode.
Monitor the link after commissioning. A stable link light does not by itself prove error-free operation. Review packet errors, drops, flaps and relevant system logs under realistic traffic. Where DDM is exposed, record the initial readings. Label both ends clearly with the remote device and port reference so that maintenance teams can trace the link without disconnecting the wrong service.
Plan lifecycle support by keeping the bill of materials, purchase record and test results together. When a module is replaced, verify the replacement code and repeat the link checks rather than assuming that any 850 nm optic will behave identically. Differences in coding, host policy or optical characteristics can affect interoperability.
Buyer questions to resolve before ordering
Provide model and port information so the SFP speed and compatibility can be reviewed.
Confirm the fibre designation and do not infer fibre type from connector shape or jacket colour alone.
Include patch leads and backbone routing rather than using only straight-line building distance.
Most new links require two optics, though one endpoint may already contain a suitable transceiver.
Review vendor policy and configuration when connecting to non-MikroTik equipment.
Include patching, cleaning, configuration, certification or troubleshooting scope in the request.
Procurement checklist
✓ Exact product code: S-85DLC05D
✓ Required module quantity and spare policy
✓ Local and remote endpoint models
✓ Confirmed 1G SFP cage support
✓ Multimode fibre grade and condition
✓ Duplex LC UPC patching requirement
✓ Route length and optical test results
✓ Required patch-cord lengths
✓ Cross-vendor coding or support restrictions
✓ Installation and interface configuration scope
✓ Delivery destination and requested schedule
✓ Warranty terms confirmed in quotation
Information for an accurate quotation
A useful request includes more than a product name. State the required quantity, delivery destination and whether the modules are for a new link, replacement or spare stock. Identify the exact device and interface at each endpoint. Add the fibre type, estimated distance, connector arrangement and any known test values.
For cross-vendor links, provide the remote manufacturer and model. Explain whether installation, fibre testing, port configuration or troubleshooting is required. This information allows FourTeck to review the requirement and highlight dependencies before a commercial offer is prepared.
Pricing shown by manufacturers or overseas sellers may exclude UAE freight, taxes, local handling and support. The applicable commercial terms should be taken from the current FourTeck quotation for the required quantity and destination.
FourTeck consultation and configuration assistance
FourTeck can help buyers clarify whether the MikroTik S-85DLC05D matches the intended link. The review can cover endpoint models, port type, fibre mode, approximate reach, patching and required quantity. Where the project includes a wider network change, the discussion can also address switch selection, uplink design, redundancy, installation scope and testing expectations.
A compatibility review is most useful when the buyer shares complete information. Even a standards-based optical module can be affected by host restrictions or a mismatched remote optic. FourTeck can coordinate quotation details around the known requirement, while final compatibility should be validated against the actual devices, firmware and cable plant.
For broader technology requirements, buyers can review the FourTeck product portfolio, explore available network and technology services, or send project details through the FourTeck contact page.
UAE availability and support guidance
Contact FourTeck to confirm current UAE availability for the MikroTik S-85DLC05D. Availability may depend on quantity, vendor lead time, import schedule and the complete requirement. Delivery coordination can be discussed after the product code, quantity and destination are confirmed. Installation, configuration, fibre testing and troubleshooting are separate scope items and should be included in the quotation request when needed.
For projects in Dubai, Abu Dhabi, Sharjah and Ajman, FourTeck can review the requested optics alongside the endpoint hardware and supporting accessories. The commercial response can distinguish the product supply from optional technical work, helping procurement and IT teams understand what is included. Warranty guidance should be taken from the issued quotation and applicable manufacturer or supplier terms rather than assumed from an unrelated online listing.
Share the site location, quantity, planned deployment date and technical details early, particularly when a project involves several links or a maintenance window. This supports more accurate product selection and delivery planning without creating an unsupported promise of stock or a fixed installation date.
GCC Availability
FourTeck can assist organisations planning MikroTik optical links across GCC markets, including the United Arab Emirates, Saudi Arabia, Kuwait, Qatar, Bahrain and Oman. Support can begin with a requirement review covering the exact SFP model, host devices, multimode fibre, link distance, quantity and accessory needs. Where a deployment includes installation or configuration, those activities should be defined separately so the quotation reflects the actual project scope.
Product availability, delivery schedules, service visits and vendor lead times can vary by country, quantity and destination. Licensing is not normally the central requirement for this passive optical module, but host-device software, vendor support policy and local operating conditions still need consideration. Buyers should provide the destination country, required quantity, endpoint models, expected schedule and any testing or deployment support expectations. For Kuwait-related projects, the FourTeck Kuwait resource may also help with regional coordination.
Africa Availability
FourTeck can help organisations in Africa evaluate the S-85DLC05D as part of a wider network requirement. The review can cover whether the installed fibre is multimode, whether both endpoints support 1G SFP operation, how many modules and patch leads are required, and whether testing, configuration or support coordination should be included. This is useful for enterprise offices, campuses, hospitality sites, service providers and system integrators planning repeatable optical links across multiple locations.
Fulfilment can depend on destination, quantity, shipping arrangements, vendor lead time, power and regulatory context for the host equipment, and local project conditions. Buyers should share the destination country, exact product requirement, quantity, preferred deployment schedule and technical support expectations. For regional information, visit FourTeck Africa, FourTeck Kenya or FourTeck Uganda. Current inventory, customs outcomes and onsite coverage should always be confirmed for the specific request.
Related products and services to consider
Single-mode SFP alternatives
For longer links or installed single-mode fibre, review a suitable single-mode optic rather than substituting this multimode module.
10G SFP+ modules
Where the business requires 10 Gigabit throughput, select an SFP+ optic and confirm that both endpoints support the chosen speed and media.
LC multimode patch leads
Choose the correct fibre grade, duplex LC UPC connectors and length. Do not assume that an existing patch lead is clean or correctly rated.
MikroTik switches and routers
Review current host devices with suitable SFP cages, required port counts, management features and forwarding capacity.
Fibre testing and troubleshooting
Include inspection, cleaning, loss testing and link diagnosis where the condition or mapping of the cable plant is uncertain.
Network installation planning
Define rack, patching, labelling, configuration, change-control and handover requirements before the deployment window.
Why businesses contact FourTeck
Businesses contact FourTeck when they need practical assistance turning a model number into a complete purchasing requirement. For an optical module, that may include confirming whether the requested SFP matches the host ports, checking the intended fibre mode and distance, calculating the number of units, identifying patching needs and preparing a clearer bill of materials.
FourTeck can also help separate product supply from optional services such as installation, interface configuration, fibre testing and troubleshooting. This supports procurement transparency and helps technical teams avoid assumptions about what is included. When a wider refresh is involved, the discussion can cover related switches, routers, management requirements and resilience considerations.
The objective is informed selection and coordinated quotation rather than unsupported claims. Buyers can learn more about FourTeck or discuss a network requirement with the sales team.
Frequently asked questions
What is the MikroTik S-85DLC05D used for?
It is used to create a 1.25G optical connection over multimode fibre between compatible devices with suitable SFP cages. Typical applications include switch uplinks, building backbones and equipment-room connections.
Does it support 10 Gigabit Ethernet?
No. The S-85DLC05D is a 1.25G SFP module. A 10G requirement needs compatible SFP+ ports and an appropriate 10G optic.
Can it be used with single-mode fibre?
It is specified for multimode fibre at 850 nm. Use a suitable single-mode transceiver when the installed cable plant or distance requires single-mode operation.
Is 550 metres guaranteed on every multimode cable?
No. The stated reach depends on fibre grade, connector condition, splices, patching and total optical loss. The route should be checked and tested.
What connector does the module use?
It uses a dual LC UPC optical connector. A suitable duplex multimode LC patch lead is normally required for each endpoint connection.
Will it work in non-MikroTik equipment?
MikroTik states that the module is compatible with non-MikroTik SFP devices, but the exact host model, firmware and vendor policy should still be confirmed before purchase.
What does DDM provide?
Digital Diagnostics Monitoring can expose optical and operating information through a compatible host. The values available depend on the device and software.
Do I need one or two modules?
A new point-to-point link usually needs a compatible optic at each endpoint. Confirm whether one side already has a suitable module before deciding the quantity.
How can I request a Dubai quotation?
Send FourTeck the exact model, quantity, endpoint devices, fibre type, approximate link length, delivery location and any installation or testing requirements.
Is warranty or immediate availability included?
Current availability, lead time and warranty terms must be confirmed in the FourTeck quotation for the requested quantity and destination.
Confirm the optic before ordering
Share your endpoint models, multimode fibre details, route length and required quantity. FourTeck can help review the requirement and prepare a Dubai or UAE quotation.
