Overview
The SFP-16G85-SW is a high-performance, short-wavelength SFP+ optical transceiver designed for 16G Fibre Channel (16GFC) applications within data centers and Storage Area Networks (SANs). As a “SW” (Short Wavelength) module, it utilizes a cost-effective and reliable 850nm VCSEL laser to transmit data over multi-mode fiber (MMF) for distances up to 100 meters on OM4 fiber. This makes it an ideal choice for high-density, short-reach connections like server-to-switch or switch-to-switch links. A key feature is its multi-rate capability, which ensures backward compatibility with legacy 8G and 4G Fibre Channel hardware, providing a smooth and flexible upgrade path for your storage infrastructure.
Key Features
- High-Speed Performance: Supports a line rate of 14.025 Gbps for 16G Fibre Channel.
- Multi-Rate Functionality: Auto-negotiates to seamlessly operate at 16G, 8G, and 4G Fibre Channel speeds.
- Short-Reach Connectivity: Optimized for distances up to 100 meters on OM4 MMF (or 70m on OM3 MMF).
- 850nm VCSEL Laser: Employs a high-performance Vertical-Cavity Surface-Emitting Laser for efficient transmission over MMF.
- Hot-Pluggable SFP+ Footprint: Complies with the SFP+ MSA, allowing for easy installation and removal without system downtime.
- Digital Diagnostics Monitoring (DDM): Provides real-time access to critical operating parameters for network monitoring and troubleshooting.
- Low Power Consumption: Designed for energy efficiency to minimize operating costs in data center environments.
- Standard LC Connector: Features a duplex LC optical interface for compatibility with standard MMF cabling.
Applications
The SFP-16G85-SW transceiver is the industry standard for short-distance, high-bandwidth storage networking. Key applications include:
- Connecting servers with Host Bus Adapters (HBAs) to SAN fabric switches
- High-speed switch-to-switch interconnects and uplinks
- Data center storage links for rack-to-rack or top-of-rack deployments
- Direct connections between storage arrays and SAN directors
Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | SFP-16G85-SW Compatible |
| Form Factor | SFP+ |
| Data Rate | 14.025 / 8.5 / 4.25 Gbps |
| Wavelength | 850nm |
| Maximum Cable Distance | 100m over OM4 MMF |
| Connector | LC Duplex |
| Fiber Type | Multi-Mode Fiber (MMF) |
| Transmitter Type | VCSEL |
| Receiver Type | PIN |
| DDM/DOM Support | Yes |
| Commercial Temperature Range | 0°C to 70°C (32 to 158°F) |
| Power Consumption | < 1W |
| Protocols | MSA Compliant, FC-PI-5 |
Advantages
The SFP-16G85-SW module provides a highly cost-effective solution for deploying 16G Fibre Channel by leveraging existing and affordable multi-mode fiber cabling within data centers. Its multi-rate support protects investment in older hardware while enabling a clear upgrade path. Each transceiver is rigorously tested for compatibility and performance in equipment from leading vendors like Brocade, Cisco, and others, ensuring plug-and-play reliability. The integrated DDM feature enhances network manageability by giving administrators insight into the health and performance of the optical link, which is crucial for maintaining the uptime of critical storage networks.
Product & Technical FAQs
1. What does SW mean in 16G SFP+ SW?
SW stands for Short Wavelength. This designation means the module uses an 850nm laser and is intended for use with Multi-Mode Fiber (MMF) over shorter distances, typically within a data center.
2. What kind of fiber cable do I need for this 16G SFP+ module?
To reach the maximum 100-meter distance, you must use OM4 Multi-Mode Fiber. You can also use OM3 MMF for distances up to 70 meters. The cable should be terminated with LC Duplex connectors.
3. What is the difference between SFP-16G85-SW and SFP-16G31-LW?
The main difference is the reach and fiber type. The SW (Short Wavelength) module is for short distances (up to 100m) over Multi-Mode Fiber. The LW (Long Wavelength) module is for long distances (up to 10km) over Single-Mode Fiber.
4. Can this 16G Fibre Channel module work in a 10G Ethernet SFP+ port?
No. While they share the SFP+ physical form factor, 16G Fibre Channel and 10G Ethernet are different, incompatible protocols. This module must be used in a port that supports 16G Fibre Channel.
5. Is this module backward compatible with 8GFC and 4GFC?
Yes, absolutely. The SFP-16G85-SW is a multi-rate transceiver that will automatically negotiate down to operate at 8G and 4G Fibre Channel speeds when connected to slower equipment.
6. Is this an original module from a brand like Brocade?
This is a compatible module. It is manufactured to meet or exceed the specifications of original equipment manufacturers (OEMs) and is programmed to ensure it is recognized and functions identically in devices from brands like Brocade, Cisco, Dell/EMC, etc.
7. What is DDM and why is it useful?
DDM (Digital Diagnostics Monitoring) is a feature that allows you to monitor the module’s operating parameters in real-time. This includes the optical transmit power, receive power, temperature, and voltage, which helps in troubleshooting and proactive network maintenance.
8. Why is an 850nm VCSEL used in this module?
An 850nm VCSEL (Vertical-Cavity Surface-Emitting Laser) is the industry standard for short-reach, multi-mode optical communication because it offers an excellent balance of high performance, reliability, and low manufacturing cost.
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