Juniper 10GBASE-SR SFP+ Transceiver — 400m Multi-Mode Fiber

The Juniper 740-021308 is a 10GBASE-SR SFP+ optical transceiver delivering 10GbE over multi-mode fiber up to 400m at 850nm via duplex LC connector — Juniper-genuine in numeric part number format, functionally equivalent to SFPP-10G-SR-C, for use in Juniper EX, QFX, MX, PTX, and SRX platforms requiring standard 10G MMF connectivity.

Key Features

• 10GBASE-SR SFP+ for 400m 10GbE over OM4 MMF — numeric part number alternative to SFPP-10G-SR-C
• 850nm VCSEL for standard OM2/OM3/OM4 multi-mode fiber duplex LC infrastructure
• Juniper numeric part 740-021308 — interchangeable with SFPP-10G-SR-C on Juniper platforms
• DDM/DOM support for real-time optical monitoring via Junos OS
• Low-power VCSEL SFP+ for energy-efficient 10G MMF deployments

Product Specifications

• Part Number: 740-021308
• Manufacturer: Juniper Networks
• Form Factor: SFP+
• Speed: 10GbE (10GBASE-SR)
• Wavelength: 850nm (VCSEL)
• Connector: Duplex LC
• Fiber Type: Multi-Mode Fiber (MMF, OM2/OM3/OM4)

Transceiver & Interface Specifications

• Max Distance: 400m (OM4 MMF), 300m (OM3 MMF), 82m (OM2 MMF)
• TX Power: -7.3 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

• 10GbE server uplinks and inter-switch links over OM3/OM4 MMF in Juniper deployments
• Numeric part number procurement for 10GBASE-SR SFP+ capacity on Juniper platforms
• Replacing end-of-life 1GbE SFP optics with 10GbE SFP+ in existing MMF infrastructure
• EX/QFX access-to-distribution 10G fiber links in campus wiring closet environments

Compatibility

• Compatible with Juniper EX, QFX, MX, PTX, and SRX platforms with SFP+ 10G ports
• Requires OM2, OM3, or OM4 multi-mode fiber with duplex LC connectors
• Fully interchangeable with SFPP-10G-SR-C on supported Juniper platforms
• IEEE 802.3ae 10GBASE-SR compliant

Frequently Asked Questions

What is the difference between 740-021308 and SFPP-10G-SR-C?

Both are Juniper-genuine 10GBASE-SR SFP+ transceivers with identical optical specifications. The 740-021308 uses the numeric part number format, while SFPP-10G-SR-C uses the alphanumeric format. Both are fully interchangeable on supported Juniper platforms.

What is the maximum distance on OM4 fiber?

On OM4 (50µm, 4700 MHz·km bandwidth) fiber, 10GBASE-SR supports up to 400m — an extension of the 300m limit on OM3 fiber. For long data center runs approaching 300–400m, OM4 provides the reach margin required for reliable 10GBASE-SR operation.

Does the 740-021308 support DDM monitoring?

Yes — DDM/DOM is supported, enabling Junos OS to monitor TX/RX optical power, temperature, voltage, and bias current in real time via CLI (show interfaces diagnostics optics) and SNMP for proactive transceiver health management.

The Juniper 740-021308 delivers 10GBASE-SR SFP+ performance in the numeric part number format — providing up to 400m OM4 MMF reach, DDM monitoring, and broad Juniper platform compatibility as the numeric equivalent to SFPP-10G-SR-C for 10G short-reach MMF deployments across EX, QFX, MX, PTX, and SRX platforms.