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J4859C-C
Gigabit-LX-LC Mini-GBIC C Ver. HP X121 Compatible
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J4859C-C is a QSFP+ transceiver designed for high-speed data communications primarily in data center environments. It supports a 40G data rate, utilizes LC connectors, and is optimized for short-range transmission over multi-mode fiber using Ethernet protocols, ensuring efficient performance in compact network infrastructures.
Engineered with a precise QSFP+ form factor and physical dimensions of 0.62 inches in height, 1.17 inches in width, and 0.47 inches in depth, the J4859C-C is ideally suited for modern enterprise networks and telecom applications. Its design emphasizes low power consumption, robust operating and storage temperature ranges, and broad compatibility with major networking vendors.
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| J4859C-C |  J9143B-C |  J4860D-C |  J8177B-C |  J4860C-C | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP+ | SFP+ | SFP+ | QSFP | SFP+ |
| Data Rate | 40G | 10G | 10G | 100G | 10G |
| Connector Type | LC | LC | LC | LC | LC |
| Wavelength | 850nm | 850nm | 850 nm | 1310 nm | 1310 nm |
| Transmission Distance | Short-Range | Short-Range | Short-Range | Short-Range | Long-Range |
| Fiber Type | Multi-mode | Multi-mode | Multi-mode | Multi-mode | Single-mode |
| Max Distance | 100 meters | 300 meters | 300 meters | 150 meters | 80 km |
| Supported Protocols | Ethernet | Ethernet, Fiber Channel | Ethernet, Fibre Channel | Ethernet, Fibre Channel | Ethernet, Fibre Channel |
| Network Interface | Fiber | Ethernet | Fiber | Fiber | Fiber |
| Power Consumption | 3.5W | 3.5W | 3.5W | 10W | 3.5W |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista | Cisco, Juniper, Huawei, Arista |
| Product Name | J4859C-C QSFP+ Transceiver | J9143B-C 10G SFP+ Transceiver Module | J4860D-C 10G SFP+ Transceiver | J8177B-C 100G QSFP Transceiver | J4860C-C Optical Transceiver Module |
| Height | 0.62 inches | 0.66 inches | 0.33 inches | 0.5 inches | 0.50 inches |
| Width | 1.17 inches | 0.87 inches | 0.63 inches | 0.8 inches | 1.0 inches |
| Depth | 0.47 inches | 2.0 inches | 2.22 inches | 1.2 inches | 1.2 inches |
| Weight | 0.20 lbs | 0.07 lbs | 0.10 lbs | 0.1 lbs | 0.1 lbs |
Top-tier LX performance for HP X121 systems. Reliable 10km reach over single-mode fiber. The signal clarity is outstanding for building interconnects.
Flawless C-version compatibility. We've seen no link drops or latency issues since installation. A dependable and professional optical solution.
Solid build and easy deployment. These LX modules provide exactly the performance we expected for our campus-wide network links. Great value.
Impressive reliability on our long fiber spans. The HP switch identifies it correctly as an X121 module. Rock-solid performance for months.
High-quality single-mode optics. They offer perfect compatibility and clean signaling. Essential for our mission-critical data transport layers. Five stars.
Steady and dependable 1GbE LX link. The build quality is excellent, and it provides a reliable connection for our remote branch offices.
The J4859C-C is a 1000Base-LX-LC hot-swappable SFP transceiver that provides reliable single-mode fiber connectivity up to 10 km for HP X121 series switches.
Yes, the J4859C-C is HP X121 compatible and has been factory-tested to ensure seamless interoperability without firmware upgrades.
It uses single-mode fiber with LC-duplex connectors optimized for 1310 nm wavelength transmission.
The module supports link distances up to 10 kilometers over standard single-mode fiber.
The J4859C-C supports 1.25 Gbps for Gigabit Ethernet applications.
It operates at a 1310 nm nominal wavelength for long-reach single-mode deployments.
Yes, the module is hot-pluggable, allowing insertion or removal without powering down the switch.
Yes, the J4859C-C features DOM for real-time monitoring of optical power, temperature, and voltage.
It uses a standard LC-duplex connector for fiber interface.
The J4859C-C is a single-mode transceiver designed for long-distance links.
It operates reliably between 0°C and 70°C ambient temperature.
Yes, when purchased from an authorized reseller, the module includes HP's limited lifetime warranty.
Align the module with the SFP slot, insert until it clicks, and lock the latch; no additional configuration is required.
Check the switch’s SFP status LED and use the “show interfaces transceiver detail” command to confirm link status and diagnostics.
Although optimized for HP X121, it is interoperable with most 1000Base-LX SFP-compatible switches.
Ensure correct fiber type and polarity, inspect connectors for damage, verify compatibility, and review DOM readings for signal levels.