# SFP transceiver module HP 1.25Gbps 1000BASE-LX SM 20km 1310nm LC duplex with DMI (J4859D)

**URL:** https://aio.lv/en/product--hp-sps-7120whpe-j4859d-oem--12037002
**Data updated:** 2026-03-12 16:45 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** HP
**Manufacturer code:** SPS-7120WHPE (J4859D OEM)
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

HP SFP transceiver module (J4859D) supports 1.25Gbps Ethernet over single-mode fiber using 1000BASE-LX at 1310nm wavelength. Designed for links up to 20 km, it uses an LC duplex connector, operates from 0–70°C at 3.3V and provides digital optical monitoring (DMI) for diagnostics. Suited for switches, routers and optical uplinks in data centers and enterprise networks.

## Long description

HP SFP transceiver module 1.25Gbps 1000BASE-LX is a small form-factor pluggable optical module designed for gigabit Ethernet over single-mode fiber. The module transmits at 1310 nm and supports link lengths up to 20 km using an LC duplex connector. It operates from a 3.3 V supply, supports 1.25 Gbps data rate and includes digital optical monitoring (DMI) for real-time diagnostics. The module is intended for installation in compatible SFP ports on switches, routers and optical uplink equipment in data centers and enterprise networks.
Advantages
This HP SFP transceiver provides a compact, hot-pluggable solution for establishing long-reach gigabit links over single-mode fiber. Built-in digital optical monitoring allows network administrators to view parameters such as transmit and receive power, temperature and laser bias for easier diagnostics and maintenance. The LC duplex interface and industry-standard SFP form factor ensure broad compatibility with equipment that accepts 1000BASE-LX modules.
Suitable for
Fiber uplinks between switches and routers within campus and enterprise networks
Long-reach connections to edge devices or aggregation points up to 20 km
Fiber-based server or storage connectivity in data centers requiring single-mode links
Replacement or expansion of existing 1000BASE-LX SFP ports
Key specifications
Data rate: 1.25 Gbps (Gigabit Ethernet)
Optical standard: 1000BASE-LX
Wavelength: 1310 nm
Maximum link length: up to 20 km over single-mode fiber
Connector: LC duplex
Form factor: SFP (small form-factor pluggable)
Power supply: 3.3 V
Operating temperature range: 0 to 70 °C
Diagnostic feature: Digital optical monitoring (DMI)
How to use
Ensure the host device supports 1000BASE-LX SFP modules and that the SFP slot is powered down or follows hot-plug procedures described by the equipment vendor. Insert the transceiver into the SFP port until it latches, then connect single-mode LC duplex fiber patch cords with correct polarity. After insertion, verify link status on the host device and use the DMI registers to check optical power, temperature and other diagnostic parameters via the management interface. Observe vendor guidelines for hot-plugging and static-sensitive handling.
Usage recommendations
For reliable operation, use single-mode fiber with appropriate attenuation budget for distances up to 20 km, keep LC connectors clean and use dust caps when modules are unused. Monitor DMI values periodically to detect degradation in optical power or temperature anomalies, and follow the equipment vendor's compatibility list to ensure full interoperability.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All HP products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized HP service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty