# Fiber optic SFP LC SX transceiver module HP X121 1G 850 nm 1000 Mbit/s

**URL:** https://aio.lv/en/product--hp-j4858c-3rd--429861
**Data updated:** 2026-03-11 11:40 (EET)
**Category:** Network Switches
**Manufacturer:** HP
**Manufacturer code:** J4858C 3RD
**EAN:** 4040348064827
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 26.99 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 22.31 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hp-j4858c-3rd--429861

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

HP X121 is a fiber optic SFP LC SX transceiver module supporting 1G (1000 Mbit/s) data rate at 850 nm wavelength. Designed for short-range multimode fiber links, it fits SFP interfaces and provides compact 56.9 × 13.7 × 12.2 mm form factor. Typical use cases include connecting switches, routers and servers in data center and campus networks.

## Long description

The HP X121 fiber optic SFP LC SX transceiver module provides a compact solution for short-range multimode fiber connections at Gigabit speeds. Supporting 1000 Mbit/s data rate over an 850 nm wavelength, this small form-factor pluggable (SFP) module is intended for use with SFP-compatible ports on switches, routers and servers. With a compact footprint of approximately 56.9 × 13.7 × 12.2 mm and a lightweight build, it is suitable for dense installation environments such as data centers and campus networks. The module supports full-duplex operation and is specified for reliable operation over multimode fiber distances up to 550 m.
Advantages
This transceiver offers gigabit throughput over multimode fiber with low physical size and weight, enabling high port density in rack-mounted equipment. The LC connector interface and SFP form factor make it hot-pluggable and compatible with common networking hardware that accepts SFP modules. Operating at 850 nm and optimized for short-range links, the module balances performance and power efficiency for typical intra-building and campus runs.
Suitable for
Connecting switches within data centers and wiring closets
Server uplinks to network aggregation equipment
Short-range campus or building backbone links over multimode fiber
Replacing or expanding SFP slots in enterprise network devices
Key specifications
Interface type: LC duplex fiber connector
Form factor: Small Form-factor Pluggable (SFP)
Data rate: 1000 Mbit/s (Gigabit Ethernet)
Wavelength: 850 nm
Supported fiber type: Multimode fiber (MMF)
Maximum reach: up to 550 m on suitable multimode fiber
Duplex mode: Full-duplex
Typical dimensions: 56.9 × 13.7 × 12.2 mm
Weight: approximately 0.02 kg
How to use
Ensure the target device supports SFP modules and that the link uses compatible multimode fiber and LC connectors. Power down the port or follow the device vendor's hot-swap guidance, insert the SFP module into an available SFP slot until it seats, and connect duplex LC patch cords to the module and remote equipment. Verify link status through the device management interface and monitor for correct speed and duplex operation. Follow standard electrostatic discharge (ESD) precautions when handling the transceiver and keep protective caps on unused optical interfaces.
Usage recommendations
Use high-quality OM3/OM4 multimode fiber for optimal reach and signal integrity up to the module's specified distance. Match fiber type and connector polarity at both ends of the link, and confirm interoperability with the network device vendor's supported transceiver list when possible. Perform optical power and link testing after installation to verify performance and continuity.

## Specifications

| Feature | Value |
|---|---|
| Interface type | SFP |
| Duplex system | Full |
| Maximum transfer distance | 550 m |
| Fiber cable diameters supported (core/cladding) | 50/125, 62.5/125 |
| SFP transceiver type | Fiber optic |
| Multi-mode fiber (MMF) supported | Yes |
| SFP transceiver standard | SX |

### Performance

| Feature | Value |
|---|---|
| Maximum data transfer rate | 1000 Mbit/s |

### Optical fiber

| Feature | Value |
|---|---|
| Wavelength | 850 nm |

### Ports & interfaces

| Feature | Value |
|---|---|
| Fiber ports quantity | 1 |
| Fiber optic connector | LC |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.02 kg |
| Height | 12.2 mm |
| Width | 56.9 mm |
| Depth | 13.7 mm |

## FAQ

### How much does the HP X121 1G SFP LC SX fiber transceiver cost, and is it available for purchase?

The price is 26.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 50 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 03.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

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