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SFP-25G-SR-S
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Cisco 25GBASE-SR S-Class SFP28 Transceiver Module, 70m OM3 /...
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Name:
SFP-25G-SR-S
- Description:
- Cisco 25GBASE-SR S-Class SFP28 Transceiver Module, 70m OM3 / 100m OM4 MMF, LC, RS-FEC
- Rating:
Added to cart 28 times recently
- Availability:
Ready to Ship
- Brand:
- Cisco
- GTIN:
- 0818283576910
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 3
- List Price:
$1,174.00
- Price:
$293.0075% off
Quantity:
1
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SFP-25G-SR-S Overview
SFP-25G-SR-S is a Cisco S-Class optical transceiver built in the SFP28 form factor for Cisco short-reach network ports. The module provides a 25 Gigabit Ethernet hardware interface for approved SFP28 host ports in switching and fabric-interconnect hardware. Its optical media path uses multi-mode fiber for the physical transmission channel inside structured cabling plants. The front interface presents Dual LC/PC connectivity for paired transmit and receive patch leads on duplex fiber runs. The optical engine operates at an 850 nm nominal wavelength across the supported short-reach window for 25GBASE-SR signaling. Maximum supported link length reaches 100 m on qualified multimode cabling. The operating temperature class is Commercial for standard equipment-room environments. Diagnostic monitoring support is present through the documented optical transceiver monitoring interface. Cisco places this part inside the 25GBASE-SR SFP28 portfolio for MMF module ordering.
SFP-25G-SR-S carries a 25GBASE-SR 850 nm MMF optical interface in Cisco optical power tables. TX power range delivers -8.4 dBm minimum output and +2.4 dBm maximum output. RX sensitivity reaches -10.3 dBm minimum receive power in the Cisco receiver specification. RX overload point accepts +2.4 dBm maximum receive power before receiver saturation. With NRZ modulation, one serial lane carries the encoded signal inside the 25G electrical architecture. IEEE P802.3by anchors the Ethernet physical layer for supported short-reach operation. IEEE P802.3cc also belongs to the Cisco 25G module standards set. SFF-8402 governs the 28 Gb/s pluggable transceiver solution used by SFP28 modules. The average transmit and receive power values use dBm measurement across Cisco's optical specification table. At 1.2 W maximum power consumption, the module stays within Cisco's listed SFP28 cabling specification. RS-FEC operates on the host ports for the documented 25GBASE-SR link. FCoE support applies when the host software provides the required Fibre Channel over Ethernet function.
Cisco Catalyst 9000, Cisco Nexus 9300-FX, and Cisco UCS 6500 or 6600 Fabric Interconnect families provide documented 25G contexts. OM3 and OM4 grades define the required cable class for standard short-reach operation. Data centre access, aggregation, and campus backbone roles use this optic where short 25G links terminate on SFP28 ports. Network teams place the module between adjacent racks, wiring rooms, or switch rows with defined optical budgets. Procurement teams also standardize spare quantities against approved platform lists before rollout and staging schedules across sites. Buy SFP-25G-SR-S from ORM Systems in new and certified refurbished condition. Certified refurbished stock receives module testing before dispatch for cleaner procurement risk control. Order SFP-25G-SR-S online from ORM Systems when Cisco 25GBASE-SR S-Class optics match the platform plan. Request a quote for bulk quantities when enterprise and volume buyers need matched spares across repeated switch builds.
SFP-25G-SR-S price is $293.00, a 75% saving from the Cisco list price of $1,174.00. SFP-25G-SR-S is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for SFP-25G-SR-S for additional pricing. Browse the full Cisco 25G Optical Modules series or explore all Cisco products.
SFP-25G-SR-S Specifications
- Product Type
- Optical Transceiver
- Brand
- Cisco
- Series
- Cisco 25GBASE SFP28 Modules
- Use Case
- Data Center / Enterprise Campus
- Form Factor
- SFP28
- Data Rate
- 25 Gbps
- Protocol
- Ethernet / Fibre Channel over Ethernet (FCoE)
- Fiber Type
- Multi-Mode (MMF)
- Connector Type
- LC Duplex
- Wavelength TX
- 850 nm
- Wavelength RX
- 850 nm
- Reach
- 70 m (OM3) / 100 m (OM4) / 100 m (OM5)
- Cable Standard
- OM3 / OM4 / OM5
- TX Power Min
- -8.4 dBm
- TX Power Max
- +2.4 dBm
- RX Sensitivity
- -10.3 dBm
- RX Power Max
- +2.4 dBm
- Encoding
- NRZ
- Supported Standards
- IEEE 802.3 / IEEE P802.3by / IEEE P802.3cc / SFF-8402 / SFF-8472
- DDM/DOM Support
- Yes
- Power Consumption
- 1.2 W
- Operating Temperature
- Commercial (0°C to 70°C)
- Compatible Platforms
- Cisco Catalyst 9000 / Cisco Nexus 9300-FX Series / Cisco UCS 6500 Fabric Interconnects / Cisco UCS 6600 Fabric Interconnects
- Certifications
- RoHS
SFP-25G-SR-S Use Case
Server Access to Top-of-Rack Handoff
SFP-25G-SR-S sits in 25G SFP28 host ports at the server access layer and connects short multimode fiber runs to top-of-rack or end-of-row switching. Engineers use OM3 for links up to 70m or OM4 for links up to 100m, then configure RS-FEC on the host ports to match the 25GBASE-SR requirement. The Dual LC/PC interface keeps the optic aligned with structured MMF patching. The result is a defined 25GbE server access path within the rack row fiber budget.
Access Closet to Aggregation Handoff
SFP-25G-SR-S operates in compatible Cisco SFP28 switch ports where an access closet hands 25GbE traffic to nearby aggregation over multimode fiber. The optic uses an 850nm 25GBASE-SR interface and carries links within 70m on OM3 or 100m on OM4, which keeps the design inside short-reach MMF limits. Engineers verify RS-FEC on both host ports before turning up the link. The result is a predictable short-distance uplink that avoids replacing existing multimode fiber.
Optics Standardization for 25G Refreshes
Network teams deploy the Cisco S-Class SFP28 optic as a standard short-reach part during 25GbE refresh work across compatible Cisco switching platforms. SFP-25G-SR-S gives each approved SFP28 port the same 25GBASE-SR MMF behavior, LC patching model, 850nm wavelength profile, and RS-FEC requirement. Engineers separate this part from longer-reach choices such as SFP-10/25G-CSR-S or SFP-10/25G-LR-S during bill-of-material planning. The result is cleaner spare planning and fewer mismatched optics during staged 25G migrations.
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Product Comparison Table 
| SFP-25G-SR-S |  QSFP-4SFP25G-CU3M |  SFP-10/25G-LR-S | SFP-10/25G-CSR-S |  SFP-25G-AOC10M | |
|---|---|---|---|---|---|
| Product Type | Optical Transceiver | Transceiver | Optical Transceiver | Optical Transceiver | Transceiver |
| Form Factor | SFP28 | QSFP | SFP28 | SFP28 | SFP |
| Data Rate | 25 Gbps | 25G | 10 Gbps / 25 Gbps | 10 Gbps / 25 Gbps | 25G |
| Operating Temperature | Commercial (0°C to 70°C) | 0 to 70°C | Commercial (0°C to 70°C) | Commercial (0°C to 70°C) | 0 to 70°C |
Compliance & Warranty
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Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
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If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
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Reviews & Ratings
M
Mason Reed
5
Delivered reliable 25G SR performance over MMF with low latency.
N
Noah Foster
5
Strong signal integrity and seamless compatibility.
O
Oliver Bennett
5
Stable 25G throughput in production workloads.
P
Parker Hayes
5
Excellent short-range optics for server uplinks.
Q
Quentin Reed
4
Consistent performance across multiple deployments.
R
Ryan Foster
5
Easy installation and dependable bandwidth.
S
Spencer Bennett
5
High-quality 25G SFP module for data centers.
Questions & Answers
What is Cisco SFP-25G-SR-S?
Cisco SFP-25G-SR-S is a 25GBASE-SR S-Class SFP28 optical transceiver for short-reach 25 Gigabit Ethernet links over multimode fiber. It is used in compatible Cisco SFP28 ports where network teams need 25G optical connectivity across OM3 or OM4 fiber. The module supports 70m over OM3 and 100m over OM4 with RS-FEC on the host ports.
What does the SFP-25G-SR-S model number mean?
SFP-25G-SR-S identifies a Cisco SFP28 transceiver for 25 Gigabit Ethernet short-reach fiber connections. The 25G portion refers to the 25GbE speed class, SR means short reach over multimode fiber, and the final S indicates Cisco S-Class positioning. Buyers use the SKU to match optics with Cisco-approved SFP28 switch, router, or fabric interconnect ports.
Is SFP-25G-SR-S a transceiver or a cable?
SFP-25G-SR-S is an optical transceiver module, not a direct attach copper cable or active optical cable assembly. It plugs into an SFP28 port and uses separate multimode fiber patch leads with LC connectors. This makes it suitable when the link needs a removable optic, structured fiber cabling, and 25GBASE-SR Ethernet operation across short data center or campus distances.
Where does Cisco SFP-25G-SR-S sit in the Cisco optics lineup?
Cisco SFP-25G-SR-S sits in the Cisco 25GBASE SFP28 optics portfolio as the short-reach multimode fiber option. It is positioned for 25G links up to 70m on OM3 or 100m on OM4. Adjacent Cisco options include SFP-25G-SL for shorter MMF links, SFP-10/25G-CSR-S for longer MMF reach, and SFP-10/25G-LR-S for SMF links.
What form factor does SFP-25G-SR-S use?
SFP-25G-SR-S uses the SFP28 form factor, which is the common pluggable form factor for 25 Gigabit Ethernet interfaces. It is designed for Cisco SFP28 host ports rather than SFP, SFP+, QSFP, or QSFP28 cages. Buyers should confirm the target port accepts 25G SFP28 optics before ordering this transceiver.
What data rate does Cisco SFP-25G-SR-S support?
Cisco SFP-25G-SR-S supports 25 Gigabit Ethernet operation as a 25GBASE-SR SFP28 module. It is intended for 25GbE short-reach optical links over multimode fiber. It should not be treated as a 10G dual-rate optic unless the specific host platform and Cisco compatibility matrix state support for the required operating mode.
What wavelength does SFP-25G-SR-S use?
SFP-25G-SR-S uses an 850nm short-wavelength optical interface for multimode fiber. Cisco lists the transmit and receive wavelength range as 840 to 860nm for this 25GBASE-SR 850nm MMF optic. That wavelength profile matches short-reach multimode deployments using OM3, OM4, or supported OM5 fiber cabling.
What reach does SFP-25G-SR-S support on OM3 and OM4 fiber?
SFP-25G-SR-S supports 70m on OM3 multimode fiber and 100m on OM4 multimode fiber. Cisco also lists 100m operation on OM5 in the SFP28 cabling specifications. The reach is designed for short data center rows, equipment rooms, access-to-aggregation links, and other 25GBASE-SR MMF connections within the supported fiber budget.
What connector does Cisco SFP-25G-SR-S use?
Cisco SFP-25G-SR-S uses a Dual LC/PC connector interface. It is designed for multimode fiber patch cords with PC or UPC connectors, while APC patch cords are not supported. Buyers should match the optic with LC multimode patch leads and verify that the installed fiber plant supports the required OM3, OM4, or OM5 modal bandwidth.
Does SFP-25G-SR-S require RS-FEC?
SFP-25G-SR-S requires RS-FEC on the host ports for operation. This matters because the switch, router, or network interface must support the correct forward error correction mode for a stable 25GBASE-SR link. Network teams should confirm RS-FEC support in the platform documentation and Cisco compatibility tools before deploying this optic at scale.
What is Cisco SFP-25G-SR-S used for?
Cisco SFP-25G-SR-S is used for short-reach 25GbE optical links between compatible Cisco SFP28 ports over multimode fiber. Common roles include server-to-top-of-rack connections, switch-to-switch uplinks within the same room, and short aggregation links over structured MMF. It is a practical choice when copper DAC reach is too limited and long-reach SMF optics are unnecessary.
What environment size fits SFP-25G-SR-S best?
SFP-25G-SR-S fits environments where 25G links stay within 70m on OM3 or 100m on OM4 multimode fiber. That usually means data center rows, network rooms, wiring closets, and short equipment-room runs. It is not the right optic for building-to-building spans or long fiber routes that need SMF optics such as SFP-10/25G-LR-S.
What workloads suit Cisco SFP-25G-SR-S?
Cisco SFP-25G-SR-S suits workloads that need 25GbE short-reach bandwidth between servers, switches, storage-facing Ethernet fabrics, and aggregation devices. It supports low-distance optical links where 10G is no longer enough but 40G or 100G is not required. The optic also supports FCoE with the appropriate host software support.
Is SFP-25G-SR-S suitable for top-of-rack switching?
SFP-25G-SR-S is suitable for top-of-rack switching when the switch has compatible Cisco SFP28 ports and the fiber run stays within the supported MMF reach. It is commonly used to connect servers, appliances, or nearby aggregation switches at 25GbE. The deployment should include LC multimode cabling and RS-FEC support on both host ports.
Which Cisco platforms are compatible with SFP-25G-SR-S?
SFP-25G-SR-S is supported on Cisco switches with approved SFP28 ports, subject to the Cisco Transceiver Module Group compatibility matrix. Network teams commonly validate optics against Cisco Catalyst, Nexus, and UCS Fabric Interconnect platforms before ordering. Compatibility depends on the exact hardware model, software version, port type, and Cisco optics support policy.
Does SFP-25G-SR-S work with Cisco UCS Fabric Interconnects?
SFP-25G-SR-S is listed in Cisco UCS Fabric Interconnect documentation as a relevant 25GbE SFP28 component on supported unified ports. The exact UCS model, port mode, and software release still need validation through Cisco compatibility resources. It is typically selected where UCS connectivity requires short-reach 25GBASE-SR optical links over multimode fiber.
Which standards and protocols relate to SFP-25G-SR-S?
SFP-25G-SR-S belongs to the Cisco 25GBASE SFP28 portfolio and supports 25GBASE-SR Ethernet over multimode fiber. Cisco lists the 25G modules as compliant with high-speed connectivity standards including IEEE 802.3by and IEEE 802.3cc where applicable. The module also requires RS-FEC on host ports and supports FCoE with appropriate host software support.
What fiber cabling should be used with SFP-25G-SR-S?
SFP-25G-SR-S should be used with multimode fiber cabling and LC patch leads. Cisco specifies 50 micron MMF with OM3, OM4, or OM5 modal bandwidth for the listed reaches. The optic supports 70m on OM3 and 100m on OM4 or OM5, and the cabling should use PC or UPC connectors rather than APC connectors.
How does SFP-25G-SR-S compare with SFP-25G-SL?
SFP-25G-SR-S is the better fit when a 25G MMF link needs up to 70m on OM3 or 100m on OM4. SFP-25G-SL is a shorter-link option that supports 20m on OM3 and 30m on OM4. Both are SFP28 MMF modules, but SFP-25G-SR-S covers longer short-reach runs within the same general 25G access environment.
How does SFP-25G-SR-S compare with SFP-10/25G-CSR-S?
SFP-25G-SR-S supports 25GBASE-SR links up to 70m on OM3 and 100m on OM4. SFP-10/25G-CSR-S supports longer MMF distances, up to 300m on OM3 and 400m on OM4 at 25G, depending on fiber quality. SFP-10/25G-CSR-S is usually chosen when MMF reach exceeds the SR distance limit.
How does SFP-25G-SR-S compare with SFP-10/25G-LR-S?
SFP-25G-SR-S is a short-reach multimode fiber optic for 70m OM3 or 100m OM4 links. SFP-10/25G-LR-S is a long-reach single-mode fiber optic supporting 10km on standard G.652 SMF at both 10G and 25G. The correct choice depends mainly on fiber type, distance, and whether the link is MMF or SMF.
How does SFP-25G-SR-S compare with SFP-25G-ER-I?
SFP-25G-SR-S is designed for short 25G MMF links inside data centers or equipment rooms. SFP-25G-ER-I is a 25GBASE-ER SFP28 industrial-temperature SMF module for 40km links. SFP-25G-SR-S fits short structured multimode cabling, while SFP-25G-ER-I fits long single-mode fiber spans that require engineered link planning.
Is SFP-25G-SR-S available new or refurbished?
SFP-25G-SR-S is typically sourced in new and refurbished condition through enterprise hardware resellers, depending on market availability. ORM Systems can list suitable condition options when buyers request a quote for this SKU. Refurbished optics should be tested before dispatch, matched to the required Cisco part number, and supplied with clear warranty coverage.
What is the price of Cisco SFP-25G-SR-S?
Cisco SFP-25G-SR-S pricing depends on condition, quantity, sourcing channel, and current market supply. Buyers searching for SFP-25G-SR-S price should request a quote with the target quantity, preferred condition, and delivery location. ORM Systems can provide pricing for single units, replacement stock, and larger project orders where volume pricing may apply.
Is SFP-25G-SR-S still in production?
SFP-25G-SR-S should be checked against Cisco lifecycle notices before procurement because production and support status can change over time. Buyers should verify current availability, software compatibility, and any lifecycle milestones before placing a large order. ORM Systems can help source active, surplus, or refurbished Cisco optics when the required SKU remains compatible with the target platform.
What lead time should buyers expect for SFP-25G-SR-S?
Lead time for SFP-25G-SR-S depends on stock position, quantity, condition, and destination. Common single-unit replacement orders may move faster than larger project quantities that require batch sourcing and testing. Buyers should provide the required delivery country, quantity, and deadline so ORM Systems can confirm realistic availability and dispatch timing for the exact Cisco SKU.
Are bulk discounts available for Cisco SFP-25G-SR-S?
Bulk pricing may be available for Cisco SFP-25G-SR-S when buyers need multiple optics for rack builds, access refreshes, or spare inventory. The final discount depends on quantity, condition, and supply at the time of quoting. Procurement teams should share the full bill of materials so matching optics, fiber accessories, and compatible alternatives can be quoted together.
What warranty is available with SFP-25G-SR-S from ORM Systems?
SFP-25G-SR-S may be supplied with warranty coverage from ORM Systems depending on condition and availability. The warranty term should be confirmed at quote stage, especially when comparing new, refurbished, or surplus Cisco optics. Buyers should also verify platform compatibility before installation because warranty coverage does not replace the need for approved Cisco host support.
Are refurbished SFP-25G-SR-S modules tested before dispatch?
Refurbished SFP-25G-SR-S modules should be tested before dispatch to confirm identification, optical operation, and physical condition. For a 25GBASE-SR optic, practical checks include connector inspection, link recognition in compatible SFP28 ports, and validation against expected MMF behavior. ORM Systems can supply tested refurbished units where available for buyers balancing cost and Cisco compatibility.
What certifications or compliance standards apply to SFP-25G-SR-S?
SFP-25G-SR-S is part of Cisco’s 25GBASE SFP28 module portfolio, which Cisco describes as compliant with high-speed connectivity standards including IEEE 802.3by and IEEE 802.3cc where applicable. The module uses 25GBASE-SR Ethernet operation, 850nm MMF optics, and RS-FEC on host ports. Buyers should verify any project-specific compliance requirements before procurement.
How is Cisco SFP-25G-SR-S installed?
Cisco SFP-25G-SR-S is installed by inserting the SFP28 module into a compatible Cisco SFP28 host port, then connecting LC multimode fiber patch leads. The host port should be configured for the intended 25GbE operation and RS-FEC requirements. Network teams should inspect fiber cleanliness, confirm patch polarity, and verify link status after installation.
Does SFP-25G-SR-S need a license or software feature?
SFP-25G-SR-S does not carry a standalone software license, but the host platform must support the optic, 25GbE operation, and RS-FEC behavior. Some switches or fabric interconnects may require a specific software release, port mode, or licensing level for 25G interfaces. Buyers should validate the exact platform through Cisco compatibility and licensing documentation.
What accessories or prerequisites are needed for SFP-25G-SR-S?
SFP-25G-SR-S requires compatible Cisco SFP28 host ports, LC multimode fiber patch cords, and an OM3, OM4, or OM5 fiber path within Cisco’s reach limits. RS-FEC support is also required on the host ports. Cleaning tools, inspection equipment, and spare LC patch leads are useful for avoiding link issues during installation and troubleshooting.
Where can buyers purchase Cisco SFP-25G-SR-S in the UK?
Buyers in the UK can purchase Cisco SFP-25G-SR-S through ORM Systems by requesting a quote for the exact SKU, required quantity, condition, and delivery location. The product is suitable for procurement teams sourcing Cisco 25GBASE-SR SFP28 optics for replacements, network refresh projects, or spare stock across compatible Cisco SFP28 platforms.
Does ORM Systems ship Cisco SFP-25G-SR-S internationally?
ORM Systems can support international sourcing requests for Cisco SFP-25G-SR-S, subject to availability, destination, shipping method, and export requirements. Buyers should provide the delivery country, quantity, and required condition when requesting a quote. International orders should also include the target platform details so compatibility can be checked before dispatch.