Juniper 25GBASE-SR SFP28 Transceiver — 100m Multi-Mode Fiber

The Juniper SFP-25G-SR-C is a 25GBASE-SR SFP28 optical transceiver delivering 25GbE over multi-mode fiber up to 100m at 850nm via duplex LC connector — Juniper-coded for plug-and-play compatibility with Juniper QFX, MX, and PTX platforms requiring 25G MMF connectivity for short-reach data center server uplinks and top-of-rack inter-switch links.

Key Features

• 25GBASE-SR SFP28 for 100m 25GbE over OM4 multi-mode fiber at 850nm
• Duplex LC connector compatible with standard MMF patch panel infrastructure
• Juniper-coded (SFP-25G-SR-C) for recognized, warning-free operation on Juniper platforms
• DDM/DOM support for real-time optical monitoring via Junos OS
• Low-power SFP28 form factor for high-density 25G MMF deployments

Product Specifications

• Part Number: SFP-25G-SR-C
• Manufacturer: Juniper Networks
• Form Factor: SFP28
• Speed: 25GbE (25GBASE-SR)
• Wavelength: 850nm (VCSEL)
• Connector: Duplex LC
• Fiber Type: Multi-Mode Fiber (MMF)

Transceiver & Interface Specifications

• Max Distance: 100m (OM4 MMF), 70m (OM3 MMF)
• TX Power: -8.5 to -1 dBm
• RX Sensitivity: -11.1 dBm (min)
• Power Consumption: Typically 1.0W
• DDM/DOM: Yes
• Operating Temperature: 0°C to 70°C (commercial)

Use Cases

• 25GbE server-to-switch MMF uplinks in Juniper QFX top-of-rack data center deployments
• Short-reach 25G inter-switch links in spine-leaf architectures using OM3/OM4 MMF cabling
• High-density 25G MMF breakout connections from 100G QSFP28 ports via MPO-to-LC fan-out
• Replacing end-of-life 10GbE SFP+ optics with 25GbE SFP28 in MMF-cabled data centers

Compatibility

• Compatible with Juniper QFX, MX, and PTX platforms with SFP28 25G ports
• Requires OM3 or OM4 multi-mode fiber with duplex LC connectors
• IEEE 802.3by 25GBASE-SR compliant
• Not compatible with single-mode fiber (use SFP-25G-LR-C for SMF applications)

Frequently Asked Questions

What is the maximum distance of the SFP-25G-SR-C on OM3 vs. OM4 fiber?

On OM3 (50µm, 2000 MHz·km) fiber, 25GBASE-SR supports up to 70m. On OM4 (50µm, 4700 MHz·km) fiber, reach extends to 100m. OM3 is sufficient for most in-rack and top-of-rack deployments, while OM4 supports cross-row and end-of-row switch distances up to 100m.

Can the SFP-25G-SR-C be used on the receiving end of a 100G QSFP28 SR4 breakout?

Yes — when a 100GBASE-SR4 QSFP28 is connected via MPO to 4x LC fan-out cable, the four individual 25G SR lanes each connect to a SFP28 SR port. The SFP-25G-SR-C is the appropriate optic for the SFP28 end of these breakout connections.

What is the difference between SFP-25G-SR-C and SFP-25G-LR-C?

The SFP-25G-SR-C uses 850nm VCSEL for short-reach MMF connections up to 100m, while the SFP-25G-LR-C uses 1310nm laser for long-reach SMF connections up to 10km. Select based on your fiber type (MMF vs. SMF) and link distance.

The Juniper SFP-25G-SR-C delivers Juniper-coded 25GBASE-SR connectivity over OM3/OM4 multi-mode fiber with DDM monitoring and plug-and-play platform recognition — providing the short-reach 25G MMF optic standard for Juniper QFX data center deployments, server uplinks, and spine-leaf inter-switch connections.