Cisco SFP-10G-SR — 10GBASE-SR SFP+ (850 nm, MMF, up to 400 m)

What it is: A 10 Gbps SFP+ optical transceiver for multimode fiber (MMF) using an 850 nm VCSEL. It runs 10GBASE-SR over duplex LC and supports DOM/DDM (digital diagnostics). The go-to short-reach optic for 10G uplinks inside buildings and across campus rooms.

Why buyers pick SFP-10G-SR (plain English)

• Cheap, fast, everywhere: the most common 10G optic for racks/IDFs—easy to source and deploy.

• Plays nice with your patch plant: works over OM3/OM4 (and OM5) with standard LC jumpers.

• Real-time health: DOM gives Tx/Rx power, temp, and voltage for quick troubleshooting.

60-second spec box

Optics & reach

• Wavelength: 850 nm (VCSEL)

• Fiber / connector: MMF, duplex LC

• Max distance (typical):

  • OM3 (50/125 µm, 2000 MHz·km): up to 300 m

  • OM4 (50/125 µm, 4700 MHz·km): up to 400 m

  • OM5: generally 400 m for 10G

  • Legacy OM2/OM1: short hops only; expect tens of meters depending on plant quality

Line rate & standards

• 10.3125 Gbps (Ethernet) • IEEE 802.3ae 10GBASE-SR

• SFF-8431/8432 compliant SFP+ form factor • DOM/DDM supported

Optical performance (typical ranges)

• Transmit power: about –7 to –1 dBm

• Receive sensitivity: to around –11 dBm

• Link budget: ~4–6 dB (enough for standard patch/interop in-building)

Electrical / power

• Supply: 3.3 V • Power draw: ~1.0 W max

Environment

• Operating temp: 0 to +70 °C (standard “SR”)

• Form factor: hot-pluggable SFP+

Where it fits (and when to choose something else)

• Perfect for: Top-of-rack to aggregation, IDF to MDF, cross-room runs, and campus closets where distances are ≤400 m on OM4 (≤300 m on OM3).

• Use LR (1310 nm) for single-mode links up to 10 km.

• Use ER/ZR for long single-mode spans (40/80 km).

• Use DAC/AOC for very short in-rack/row connections at the lowest cost/power.

Quick design tips (no-regret)

• Match fiber type to distance: OM4 gives more headroom than OM3; label both ends.

• Budget the link: include patch panel/connector loss (~0.3–0.5 dB each).

• Clean the LCs: a dusty ferrule ruins short-reach links—clean before testing.

• Bend radius matters: avoid tight bends in trays or behind doors; 850 nm VCSEL links are sensitive to modal issues.

TL;DR

SFP-10G-SR = 850 nm, MMF, LC duplex, up to 300 m (OM3) / 400 m (OM4). It’s the standard short-reach 10G SFP+—cheap, reliable, and perfect for in-building uplinks with DOM for easy troubleshooting.