Cisco SFP-25G-SR-S Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 25GBASE-SR SFP28 Short-Reach Multi-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:SFP-25G-SR-S
Naming Breakdown
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SFP28: 25 Gigabit Small Form-factor Pluggable hot‑swappable transceiver complying with SFF‑8402 SFP28 MSA specification
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25G: Supports 25.78125 Gbps serial bit rate for 25 Gigabit Ethernet
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SR: Short Reach, IEEE 802.3by 25GBASE-SR standard for multi-mode fiber
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S: Standard commercial temperature grade
Core Product Positioning
The Cisco SFP-25G-SR-S is a hot‑swappable commercial-grade SFP28 optical transceiver designed for short-distance 25 Gigabit Ethernet transmission over multi-mode fiber. Optimized for modern leaf-spine data center architectures, server rack uplinks, high-performance computing (HPC) clusters and enterprise campus short-range interconnections. This modulerequires RS-FEC enabled on host switch portsto achieve specified transmission distances. Integrated DOM/DDM delivers continuous real-time monitoring of optical operating parameters.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 9000 Series Switches; Catalyst 9000 Series; ASR 1000 Series Routers and all other platforms equipped with SFP28 interfaces supporting 25G Ethernet.
Verify Cisco official transceiver compatibility matrix and minimum firmware release before deployment.
Supported Operating Systems
NX-OS, IOS-XE releases supporting SFP28 MSA and SFF‑8472 digital diagnostic functions.
Supported Fiber Type
Multi-Mode Fiber (MMF) 50/125μm only. Incompatible with single-mode fiber.
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OM3 MMF: maximum 70 meters
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OM4 MMF: maximum 100 meters
Connector
Duplex LC optical connector.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable SFP28, compliant with SFF‑8402 MSA
Optical Interface
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Transmit Wavelength: 840 nm ~ 860 nm, nominal 850 nm VCSEL Laser
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Receive Wavelength: 840 nm ~ 860 nm
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Supported Bit Rate: 25.78125 Gbps (25GBASE-SR Ethernet)
Maximum Transmission Reach
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OM3 Multi-Mode Fiber: up to 70 m
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OM4 Multi-Mode Fiber: up to 100 m
Distances valid only with RS-FEC activated on host port.
Optical Power Budget
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Average Transmit Optical Power: -6.5 dBm ~ 0 dBm
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Receiver Sensitivity (OMA): Minimum -10.3 dBm
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Maximum Allowable Received Power: 0.5 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors module internal temperature, supply voltage, laser bias current, transmit optical power and receive optical power.
Environmental Operating Parameters (Commercial Grade)
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Operating Temperature:0°C ~ +70°C (32°F ~ 158°F)
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Storage Temperature: -40°C ~ +85°C (-40°F ~ 185°F)
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Relative Humidity: 5% – 95%, non‑condensing
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Maximum operating altitude: 3,000 meters
Typical Power Consumption
4. Supported Functional Capabilities
Ethernet Transport
Wire-speed full-duplex 25GBASE-SR Ethernet; RS-FEC mandatory
Layer 2 Protocol Support
802.1Q VLAN trunking, IEEE 802.3x pause frame flow control, LACP, STP/RSTP/MSTP, EtherChannel link aggregation
Interface Diagnostics
Link status detection, error statistics, DOM real-time optical telemetry, LOS (Loss of Signal) indication, Tx disable control, local loopback testing
High Availability
Supports hot-plug OIR online insertion and removal on compatible platforms; supports link redundancy via port-channels and spanning tree protocols
Operations & Management
NX-OS / IOS-XE CLI, SSH, SNMP v2c/v3, Syslog logging
5. Typical Deployment Scenarios
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Leaf‑spine data center short-distance 25GE inter-switch connections
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25G server uplinks from top-of-rack switches
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High-performance computing (HPC) cluster interconnections
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Enterprise intra-building 25G migration over existing OM3/OM4 multi-mode cabling
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Network lab and test bench 25 Gigabit Ethernet deployments
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950‑1, IEC/EN 60950‑1, CSA C22.2 No.60950‑1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES‑003 Class A
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Laser Safety: Class 1 Laser Product per IEC 60825‑1
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Industry Standards: IEEE 802.3by, SFF‑8402, SFF‑8472
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Environmental: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco SFP-25G-SR-S SFP28 Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Duplex LC multi-mode fiber patch cables sold separately.
Model Comparison Reference
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SFP-25G-SR-S: Commercial temp, 850nm MMF, 70m/100m, requires RS-FEC
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SFP-25G-SL: SFP28 short-link multi-mode module for ultra-short reach
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SFP-25G-LR-S: Single-mode 10km long-reach SFP28 transceiver
UNSPSC Classification Code
43222618 – Cisco SFP-25G-SR-S short-reach multi-mode SFP28 transceiver with DOM, hot‑swappable 25 Gigabit optical module for modern data center leaf-spine networking.
Hardware Warranty
Original Cisco transceivers are covered under Cisco limited hardware warranty; refurbished stock follows respective reseller warranty terms.
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