Cisco SFP-25G-LR-S Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 25GBASE-LR SFP28 Long-Reach Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:SFP-25G-LR-S
Naming Breakdown
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SFP28: 25 Gigabit Small Form-factor Pluggable hot‑swappable transceiver compliant 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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LR: Long Reach; IEEE 802.3cc 25GBASE-LR standard for single-mode fiber
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S: Standard commercial temperature grade
Core Product Positioning
The Cisco SFP-25G-LR-S is a hot‑swappable commercial-grade SFP28 optical transceiver designed for medium-distance 25 Gigabit Ethernet transmission over single-mode fiber. Optimized for leaf-spine data center uplinks, enterprise core interconnections, mobile network backhaul, and metropolitan access networks.RS-FEC must be enabled on host switch ports to achieve full 10 km transmission distance.Integrated DOM/DDM provides continuous real-time monitoring of critical optical operating parameters.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 9000 Series Switches; Catalyst 9000 Series Switches; ASR 1000 Series Routers; UCS Fabric Interconnects and all other platforms equipped with SFP28 interfaces supporting 25 Gigabit 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 monitoring functions.
Supported Fiber Type
Single‑Mode Fiber (SMF) G.652 (9/125μm) only; incompatible with multimode fiber.
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: 1290 nm ~ 1330 nm, nominal 1310 nm DFB Laser
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Receive Wavelength: 1290 nm ~ 1330 nm
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Supported Bit Rate: 25.78125 Gbps (25GBASE-LR Ethernet)
Maximum Transmission Reach
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Up to10 kmover standard G.652 single-mode fiber (valid with RS-FEC activated on host port)
Optical Power Budget
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Average Transmit Optical Power: -8.4 dBm ~ +0.5 dBm
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Receiver Sensitivity: Minimum -12.6 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-LR Ethernet; RS-FEC mandatory for maximum distance
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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25GE inter-switch uplinks between data center leaf and spine switches
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Enterprise inter-building backbone connections up to 10 km
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Mobile operator 25G fronthaul/backhaul transport circuits
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Metropolitan service provider aggregation point-to-point links
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Network laboratory 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 802.3cc, 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-LR-S SFP28 Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Duplex LC single-mode fiber patch cables sold separately.
Model Comparison Reference
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SFP-25G-LR-S: Commercial temperature, SMF 10km, 1310nm SFP28 transceiver
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SFP-25G-SR-S: Short-reach multi-mode 850nm SFP28 module
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SFP-25G-ER-S: Extended reach 40 km single-mode SFP28 module
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SFP-10/25G-LR-S: Dual-rate 10G/25G compatible SFP28 transceiver
UNSPSC Classification Code
43222618 – Cisco SFP-25G-LR-S long-reach single-mode SFP28 transceiver with DOM, hot‑swappable 25 Gigabit optical module for modern data center, enterprise and mobile transport networking.
Hardware Warranty
Original Cisco transceivers are covered under Cisco limited hardware warranty; refurbished units follow respective reseller warranty terms.
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