United States$5,000,000+
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J
Julian Westbrook
5
LX optics performed well on single-mode fiber.
J4859C
Aruba X121 1G SFP LC LX Transceiver
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J4859C
- Description:
- Aruba X121 1G SFP LC LX Transceiver
- Rating:
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- Hpe
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- Warranty:
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- List Price:
$703.09
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J4859C Overview
J4859C is a high-performance SFP+ transceiver designed for 10G Ethernet applications. It features LC connectors, a compact SFP+ form factor with industry-standard physical dimensions, and is optimized for short-range transmission over multi-mode fiber, making it well-suited for modern data centers and enterprise networks.
Engineered to support Ethernet protocols reliably in demanding environments, the J4859C transceiver offers the robustness and efficiency required for telecom applications. Its design balances optimal power consumption with a broad operating temperature range, ensuring consistent performance even in challenging conditions.
J4859C price is $112.50, a 84% saving from the Hpe list price of $703.09. J4859C is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for J4859C for additional pricing. Browse the full Aruba Switches Transceivers series or explore all Hpe products.
J4859C Specifications
- Product Type
- Transceiver
- Form Factor
- SFP+
- Data Rate
- 10G
- Connector Type
- LC
- Wavelength
- 850 nm
- Transmission Distance
- Short-Range
- Fiber Type
- Multi-mode
- Max Distance
- 300 meters
- Supported Protocols
- Ethernet
- Network Interface
- Ethernet
- Power Consumption
- 3.5W
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Cisco / Juniper / Huawei / Arista
- Product Name
- J4859C SFP+ Transceiver
- Height
- 0.28 inches
- Width
- 0.55 inches
- Depth
- 2.2 inches
- Weight
- 0.05 lbs
J4859C Use Case
Data Center Aggregation Uplink with J4859C-Aruba X121 1G SFP LC LX Transceiver
In a hyperscale data center, network engineers deploy the J4859C-Aruba X121 1G SFP LC LX Transceiver as a 1 Gbps uplink between ToR (Top-of-Rack) switches and aggregation switches over single-mode fiber. This transceiver’s 10 km reach and LC connector compatibility ensure low-latency, high-availability connectivity, simplifying inventory management and driving predictable throughput. Outcome: optimized rack-to-core traffic, reduced link failure risk, and streamlined fiber optics operations.
Campus Backbone Extension for University Networks
A large university extends its Gigabit Ethernet backbone across multiple buildings using the J4859C-Aruba X121 1G SFP LC LX Transceiver. Installed in Aruba campus switches, the transceiver delivers reliable 1 Gbps links over distances up to 10 km, supporting VoIP telephony, Wi-Fi access points, and e-learning servers without signal degradation. Outcome: seamless cross-campus data sharing, simplified fiber management, and enhanced end-user experience for students and staff.
Redundant Fiber Link for Financial Trading Floor Infrastructure
A financial services firm implements the J4859C-Aruba X121 1G SFP LC LX Transceiver in redundant 1 Gbps paths between trading servers and core switches. The transceiver’s industrial-grade design and error-resilient LX optics minimize packet loss and latency spikes, critical for algorithmic trading. Outcome: guaranteed failover performance, compliance with low-latency SLAs, and strengthened network reliability under peak market loads.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| J4859C |  Q9G82A |  JL563A |  J9150D |  J4860D | |
|---|---|---|---|---|---|
| Compatibility | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista | Cisco / Juniper / Huawei / Arista |
| Connector Type | LC | LC | LC | LC | LC |
| Data Rate | 10G | 40G | 10G | 40G | 10G |
| Depth | 2.2 inches | 0.3 inches | 1.5 inches | 1.0 inches | 1.5 inches |
| Fiber Type | Multi-mode | Single-mode | Multi-mode | Multi-mode | Multi-mode |
| Form Factor | SFP+ | QSFP+ | SFP | QSFP+ | SFP+ |
| Height | 0.28 inches | 0.5 inches | 0.8 inches | 0.8 inches | 0.9 inches |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Max Distance | 300 meters | 10 km | 300 meters | 100 meters | 300 meters |
| Network Interface | Ethernet | Fiber | Fiber | Ethernet | Ethernet |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | 3.5W | 4.5 W | 1.5 W | 3.5W | 3.0W |
| Product Name | J4859C SFP+ Transceiver | Q9G82A 40G QSFP+ Long-Range Transceiver | JL563A 10G SFP Transceiver | J9150D 40G QSFP+ Transceiver | J4860D 10G SFP+ Transceiver |
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Supported Protocols | Ethernet | Ethernet / Fibre Channel | Ethernet | Ethernet | Ethernet, Fibre Channel |
| Transmission Distance | Short-Range | Long-Range | Short-Range | Short-Range | Short-Range |
| Wavelength | 850 nm | 1310 nm | 850 nm | 850 nm | 850nm |
| Weight | 0.05 lbs | 0.1 lbs | 0.05 lbs | 0.15 lbs | 0.1 lbs |
| Width | 0.55 inches | 0.25 inches | 1.2 inches | 0.65 inches | 0.65 inches |
Reviews & Ratings
K
Kashif Dunne
4
Consistent long-distance connectivity.
A
Anders Blom
4
Stable signal quality.
R
Rizwan Hale
5
No issues in production.
M
Matthew Cole
4
Reliable SFP module.
Questions & Answers
What is the Aruba X121 1G SFP LC LX Transceiver?
The Aruba X121 1G SFP LC LX Transceiver is a hot-swappable optical module designed for gigabit Ethernet links over single-mode fiber, offering 1.25 Gbps data rate, LC duplex connectors, and a 10 km reach at 1310 nm wavelength.
What transmission distance does the Aruba X121 1G SFP LC LX Transceiver support?
The Aruba X121 1G SFP LC LX Transceiver supports up to 10 km over single-mode fiber at 1310 nm for reliable long-haul optical connectivity.
Which Aruba switches are compatible with the X121 1G SFP LC LX Transceiver?
The Aruba X121 1G SFP LC LX Transceiver is compatible with Aruba X100, X200, X300, CX Series, ArubaOS-CX switches and any standard SFP-enabled gigabit Ethernet port supporting LX optics.
What type of fiber cable does the Aruba X121 1G SFP LC LX Transceiver require?
This transceiver requires single-mode duplex fiber with LC connectors to achieve maximum performance and reach up to 10 km.
How do I install the Aruba X121 1G SFP LC LX Transceiver?
To install, power off the switch port if possible, align the LC connector, insert the SFP module firmly until it clicks, then power on the port; the switch auto-detects the transceiver.
What wavelength does the Aruba X121 1G SFP LC LX Transceiver use?
The Aruba X121 1G SFP LC LX Transceiver operates at a nominal wavelength of 1310 nm for single-mode fiber applications.
What is the data rate supported by the Aruba X121 1G SFP LC LX Transceiver?
It supports a data rate of 1.25 Gbps (nominal) for full-duplex gigabit Ethernet connections.
Is the Aruba X121 1G SFP LC LX Transceiver hot-swappable?
Yes, the Aruba X121 1G SFP LC LX Transceiver supports hot-swapping, enabling insertion or removal without powering down the switch.
What is the operating temperature range for the Aruba X121 1G SFP LC LX Transceiver?
The operating temperature range is 0 °C to 70 °C (32 °F to 158 °F) for standard operating environments.
How much power does the Aruba X121 1G SFP LC LX Transceiver consume?
The Aruba X121 1G SFP LC LX Transceiver consumes approximately 1 W of power under typical operating conditions.
What warranty covers the Aruba X121 1G SFP LC LX Transceiver?
Aruba offers a limited lifetime warranty covering defects in materials and workmanship for the X121 1G SFP LC LX Transceiver when purchased through authorized resellers.
Can I use the Aruba X121 1G SFP LC LX Transceiver in non-Aruba devices?
Yes, the Aruba X121 1G SFP LC LX Transceiver is IEEE 802.3z compliant and interoperable with any vendor’s gigabit Ethernet port that supports LX SFP optics.
What are the differences between LX and SX transceivers in Aruba X121 series?
LX transceivers operate at 1310 nm over single-mode fiber for distances up to 10 km, while SX transceivers use 850 nm over multimode fiber for distances up to 550 m.
What use cases are ideal for the Aruba X121 1G SFP LC LX Transceiver?
Ideal use cases include campus backbone links, data center interconnects, and long-reach enterprise fiber runs where single-mode connectivity and gigabit speed are required.
How do I order the Aruba X121 1G SFP LC LX Transceiver (SKU: J4859C)?
You can order the Aruba X121 1G SFP LC LX Transceiver, SKU J4859C, through authorized Aruba partners or distributors by referencing the SKU in your purchase order.
What should I do if the Aruba X121 1G SFP LC LX Transceiver link is down?
Check fiber polarity, clean LC connectors, verify fiber distance and compatibility, reseat the module, and confirm switch SFP port configuration to troubleshoot link issues.