Detailed Specifications
HPE JL251A X140 40G QSFP+ LC BiDi 100 m MM Transceiver
Overview
The HPE JL251A is a 40 Gigabit Ethernet QSFP+ transceiver module designed for rack-server or data-centre connectivity over multimode fibre. It uses bidirectional (BiDi) signalling over a duplex LC connector pair to achieve 40 Gb/s link speed within a compact QSFP+ form factor. Rated for up to approximately 100 metres over OM4 multimode fibre, it enables high-density uplinks between switches or in aggregation layers without the need for multiple fibre strands. The module is hot-pluggable and fits into standard QSFP+ ports, making it suitable for high-throughput inter-rack or top-of-rack switching environments. Because it supports BiDi operation and reduces fibre-pair usage, it is particularly effective where cable strands are constrained or where future bandwidth upgrades are anticipated.
Key Features
QSFP+ form-factor supporting 40 Gb/s data throughput
Bidirectional optical transmission over a single multimode fibre pair
Duplex LC connector for ease of deployment and fibre-management
Up to ~100 m reach over OM4 multimode fibre in typical data-centre environments
Technical Specifications
| Specification | Value |
|---|
| Brand | HPE |
| Part Number | JL251A |
| Product Type | X140 40 Gb/s QSFP+ LC BiDi Transceiver |
| Link Speed | 40 Gb/s |
| Form Factor | QSFP+ |
| Connector Type | Duplex LC |
| Fibre Type | Multimode (50/125 µm) |
| Maximum Reach | Up to ~100 m (on OM4) |
| Wavelength | Approx. 850 nm (BiDi twin wavelengths) |
| Operating Temperature | 0 °C to ~70 °C |
| Dimensions (W × D × H) | ~0.72″ × ~4.80″ × ~0.51″ (18.3 mm × 121.9 mm × 13 mm) |
| Weight | ~1.40 lb (~0.635 kg) |
| Hot-Pluggable | Yes |
| Typical Use Case | Switch-to-switch or aggregation uplink in data-centres |
| Compliance | 40GBASE-SR-BiDi, QSFP+ MSA compliant |
