Description
Hard-Numbers: Technical Specifications
- Standard: IEEE 802.3z 1000BASE-SX
- Wavelength: 850 nm (VCSEL)
- Fiber Type: Multimode 50/125µm or 62.5/125µm
- Maximum Distance: 550 meters (50µm), 220 meters (62.5µm)
- Data Rate: 1.25 Gbps
- Connector: LC Duplex
- Operating Temperature: 0°C to +70°C (Commercial Grade)
- Power Supply: 3.3V from host
- Power Draw: 1.0W maximum
- TX Power: -9.5 to -4.0 dBm
- Receiver Sensitivity: -17 dBm minimum
- Certifications: CE, FCC, RoHS, IEC 60825-1 Class 1 Laser Product
Enterasys SSA-G1018-0652
The Real-World Problem It Solves
Copper Ethernet hits a hard 100-meter wall and gets hammered by EMI in industrial environments. This SFP module lets you run fiber up to 550 meters through electrical noise without signal degradation. When you need to connect a remote I/O rack in a motor room or bridge between control buildings, multimode fiber with 850nm optics keeps the link alive where copper fails.
Where you’ll typically find it:
- DCS network switches linking to remote field cabinets
- Control room to PLC rack fiber uplinks
- Cross-campus network backbone connections
- High-EMI environments near VFDs, transformers, and large motors
Bottom line: It extends your network beyond copper limits with immunity to electrical noise.
Hardware Architecture & Under-the-Hood Logic
This SFP module packs a VCSEL laser transmitter and PIN photodiode receiver into a hot-swappable MSA-compliant package. The module handles bidirectional optical-to-electrical conversion independently for transmit and receive paths. Digital diagnostic monitoring (DDM/DOM) tracks internal health parameters and reports them to the host switch.
- The host switch sends electrical serial data to the SFP transmitter circuitry.
- The VCSEL laser converts electrical signals to 850nm optical pulses.
- Optical light travels through the TX fiber strand to the remote SFP receiver.
- The remote SFP’s PIN photodiode converts optical pulses back to electrical signals.
- The receiver circuitry conditions and amplifies the electrical signal for the host switch.
- DDM/DOM circuitry continuously monitors temperature, voltage, TX/RX power, and bias current, reporting anomalies to the host.
Enterasys SSA-G1018-0652
Field Service Pitfalls: What Rookies Get Wrong
Mismatching Fiber TypesRookies install 1000BASE-SX SFPs on single-mode fiber, or single-mode SFPs on multimode fiber. The link won’t come up or suffers high error rates because the core diameters and optical properties don’t match.
- Field Rule: Always verify fiber type before installing SFPs. Use 1000BASE-SX (850nm) for multimode only, 1000BASE-LX (1310nm) for single-mode.
Dirty Fiber Connectors Causing Intermittent LinksNew technicians plug fiber connectors without cleaning. Dust, oil, or contaminants on the LC connector cause signal degradation, high bit error rates, and intermittent link failures that drive you crazy.
- Field Rule: Clean both fiber connectors every time you plug/unplug. Use proper fiber cleaning tools—one-time cleaning wipes or click-cleaners. Inspect connectors with a fiber microscope if available.
Ignoring Digital Diagnostics Until Link FailsEngineers don’t monitor the SFP’s digital diagnostic parameters. Early warning signs of degradation (low TX power, high RX errors) are missed until the link fails completely during production.
- Quick Fix: Enable DDM/DOM monitoring on the switch port. Check TX/RX power levels regularly. Replace SFPs when TX power drops below -12 dBm or RX errors increase.
Exceeding Maximum Fiber DistanceTechnicians run multimode fiber beyond the 550-meter limit for 1000BASE-SX. Signal attenuation causes link instability or complete failure, especially at higher data rates.
- Field Rule: Calculate total fiber distance including patch panels and jumpers. For distances over 550 meters, use 1000BASE-LX single-mode SFPs or consider fiber repeaters.
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
