HPE QK724A Compatible 16G Fibre Channel SFP+ Optical Transceiver with DOM

Product Specifications

HPE QK724A Compatible LINK-PP LS-MM8516-S1C 16G Fibre Channel SFP+ SW Optical Transceiver 850nm 100m Duplex LC for SAN Storage Networks

The LINK-PP LS-MM8516-S1C is a high-performance, HPE QK724A compatible 16G Fibre Channel (16GFC) SFP+ Short Wave (SW) optical transceiver engineered for high-speed Storage Area Networks (SAN), enterprise storage fabrics, and Hewlett Packard Enterprise (HPE) StoreFabric environments.

Built with an advanced 850nm VCSEL laser, a high-sensitivity PIN receiver, and fully compliant with FC-PI-5 and SFF-8431 standards, this module delivers predictable 14.025Gbps optical performance with backward compatibility for legacy 8G and 4G FC ports. Featuring built-in Digital Diagnostic Monitoring (DOM/DDM) compliant with SFF-8472, it provides storage administrators with real-time telemetry data to ensure zero-packet-loss transmission and strict signal integrity across mission-critical HPE storage architectures.

Application Topologies and Deployment Scenarios

Understanding where and how 16G SFP+ SW optics fit into your storage architecture is critical for eliminating I/O bottlenecks. This transceiver is strictly optimized for low-latency, loss-less data transmission within data center storage racks and adjacent rows.

HPE StoreFabric and SAN Core Switching

In modern high-density SAN environments, 16G FC optical transceivers are standardly deployed in HPE StoreFabric B-series (Brocade) and C-series (Cisco MDS) director-class and edge switches to support massive block-level data transfers. Typical engineering applications include interconnecting SAN switches (Inter-Switch Links) to build highly available storage fabrics that require deterministic performance and microsecond latency.

ProLiant Server HBA to Storage Array Connectivity

This module is widely utilized to establish direct, high-speed uplinks between enterprise servers (such as HPE ProLiant Gen9/Gen10) equipped with 16G Host Bus Adapters (HBAs) and centralized storage systems. It ensures bottleneck-free I/O performance for heavy database workloads, All-Flash Arrays (AFA), and robust connectivity to storage platforms like HPE MSA, 3PAR StoreServ, and Alletra arrays.

Seamless Storage Fabric Upgrades

With inherent auto-negotiation capabilities (supporting 14.025Gbps, 8.5Gbps, and 4.25Gbps link rates depending on the switch port configuration), this transceiver provides a risk-free upgrade path for legacy 4G/8G SAN infrastructures. Data centers can incrementally scale their storage bandwidth without completely overhauling their existing multimode fiber cabling plant.

Physical Layer Design and Optical Performance Optimization

Storage traffic is highly sensitive to frame drops and CRC errors. The reliability of a 16G optical link relies fundamentally on the physical layer and chip-level engineering. LINK-PP transceivers are manufactured to exceed standard Fibre Channel physical layer requirements.

Optical Transmitter and Receiver Architecture

The transmission core utilizes a highly reliable 850nm VCSEL (Vertical-Cavity Surface-Emitting Laser). On the receiving end, a low-dark-current PIN photodiode ensures excellent optical-to-electrical conversion. This matched TOSA/ROSA architecture effectively minimizes jitter and guarantees a clean eye diagram for 14.025Gbps serial data streams.

Signal Integrity and Link Budget Engineering

The optical link budget determines whether a transceiver can maintain stable communication across intermediate patch panel losses in a SAN environment. The LS-MM8516-S1C is strictly engineered to deliver robust optical metrics:

• Tx Output Power: -7.8 dBm to -0.5 dBm
• Rx Sensitivity: Better than -10.5 dBm
• Receiver Overload: 0.5 dBm
• Max Data Rate: 14.025Gbps

This optimized optical budget provides sufficient margin to accommodate standard insertion losses from LC connectors and MTP/MPO breakout cassettes without compromising payload integrity.

Thermal Management and Reliability Optimization

Designed with a premium die-cast metal housing, this hot-pluggable transceiver ensures superior EMI shielding and thermal management in high-density rack environments. Operating efficiently on a single +3.3V power supply, it remains thermally stable across commercial operating temperatures (0°C to 70°C) and complies strictly with RoHS environmental standards.

Multi-Vendor Compatibility and DOM/DDM Diagnostics

Storage administrators require optics that operate seamlessly within proprietary HPE SAN ecosystems while providing granular visibility into link health to prevent unexpected storage disconnections.

HPE Hardware and Fabric OS Compatibility Validation

Engineered for maximum interoperability, the LINK-PP LS-MM8516-S1C undergoes rigorous internal EEPROM coding and hardware validation in actual HPE equipment. It is natively recognized by SAN operating systems as an HPE QK724A compatible module, ensuring plug-and-play deployment across HPE StoreFabric switches and qualified HBAs without triggering "unsupported transceiver" lock-out errors or support warnings.

Real-Time Digital Diagnostic Monitoring (DOM/DDM)

Equipped with Real-Time Digital Diagnostic Monitoring (compliant with SFF-8472), this transceiver provides immediate access to critical physical layer metrics. SAN administrators can actively monitor core parameters via switch CLI (such as Brocade FOS or Cisco NX-OS via HPE wrappers) or SNMP interfaces, tracking Transceiver Temperature, +3.3V Supply Voltage, Laser Bias Current, Transmitted (Tx) Power, and Received (Rx) Power.

Optical Link Health and Preventive Maintenance

By leveraging DOM telemetry, IT operations can transition from reactive storage troubleshooting to proactive maintenance. Monitoring Rx power degradation helps identify dirty fiber end-faces or micro-bends, which is absolutely critical since 16G Fibre Channel is highly susceptible to performance degradation from optical return loss.

Selection Guide and Deployment Considerations

Choosing the correct Fibre Channel optical transceiver is critical for SAN stability. Below are essential deployment guidelines to ensure optimal performance.

Choosing Between Short Wave (SW) and Long Wave (LW) Optics

Select this Short Wave (SW) 850nm module for intra-building or intra-rack storage connections using Multimode Fiber (MMF). For longer campus or cross-data-center SAN extensions requiring spans up to 10km, a 1310nm Long Wave (LW) Single-Mode transceiver must be utilized.

Fiber Type and Distance Matching

To achieve the maximum 14.025Gbps rated distance, ensure your physical cabling infrastructure matches these transceiver specifications:

• OM3 Multimode Fiber: Up to 100 meters (Recommended modern baseline)
• OM2 Multimode Fiber: Up to 35 meters (Supported for legacy environments)
• Connector Type: Duplex LC (Ensure UPC polish, absolutely do not use APC green connectors)

Common Deployment Mistakes in HPE SAN Environments

To ensure a flawless SAN installation, storage network technicians should avoid these frequent deployment errors:

• Mixing SMF and MMF: Using Single-Mode Fiber patch cords with this SW (Multimode) transceiver causes immediate massive signal attenuation and failure to sync.
• Dirty LC Connectors: Microscopic dust on an 850nm VCSEL laser is the leading cause of low Rx power and CRC errors in Fibre Channel networks. Always inspect and use a one-click cleaner before insertion.
• Port Speed Configuration: While auto-negotiation is standard, manually forcing a 16G port to connect to an incompatible legacy 1G/2G storage device will result in a down link (this module only steps down to 8G and 4G).