SFP transceiver OEM X121 J4858C_OEM 1G LC SX

Name: SFP transceiver OEM X121 J4858C_OEM J4858C_OEM
Brand: OEM
SKU: 3520264
Price: 13.99 EUR
Availability: InStock

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SFP transceiver OEM X121 J4858C_OEM 1G LC SX module

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Short description

SFP transceiver OEM X121 J4858C_OEM 1G LC SX is a small form-factor pluggable fiber module for 1 Gigabit optical links using LC connector and short-range (SX) optics. Designed for compatible switches and routers, it enables 1G Ethernet connectivity over multimode fiber, useful for data center uplinks, switch-to-switch links, and short-distance network extensions.

Available for order: 7 pcs.

Warranty: 1 Year

SKU: 3520264

Manufacturer: OEM

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Deliver the order:

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2b. Kengaraga str., Riga, Latvia, LV-1063

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From 4.99 €

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From 1.99 €

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Payment Methods:

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Product information

Description

SFP transceiver OEM X121 J4858C_OEM 1G LC SX module is a small form-factor pluggable fiber module that provides 1.25 Gbps optical links for 1000BASE-SX networks. It uses multimode fiber optics with an 850 nm VCSEL light source and an LC duplex connector, supporting typical short-range connections up to 300 m (or up to 550 m depending on fiber grade). The module operates from a 3.3 V supply and is specified for use in environments from 0 to 70°C. It is compatible with HP equipment and equivalent to the J4858C model.

Advantages

The module offers compact SFP form factor for hot-pluggable installation, standardized 1000BASE-SX performance for short-range multimode links, and an LC duplex interface for easy connection. Low-voltage 3.3 V operation and wide operating temperature range make it suitable for standard network equipment racks. HP compatibility (J4858C equivalent) simplifies replacement and interoperability with systems that require that transceiver footprint.

Suitable for

Data center uplinks and uplink ports on switches
Switch-to-switch or switch-to-server multimode connections
Short-distance campus or building backbone links over multimode fiber
Upgrading or replacing SFP transceivers in compatible HP or OEM network equipment

Key specifications

Form factor: SFP (small form-factor pluggable)
Data rate: 1.25 Gbps (1000BASE-SX)
Wavelength: 850 nm (VCSEL)
Fiber type: Multimode (MM)
Connector: LC duplex
Typical reach: 300 m / up to 550 m depending on multimode fiber grade
Supply voltage: 3.3 V
Operating temperature: 0 to 70°C
Compatibility: HP compatible, equivalent to J4858C

How to use

Insert the SFP transceiver into an available SFP slot on a compatible switch or router while the device is powered on or during maintenance windows if hot-swap is not supported by your hardware. Connect LC duplex multimode fiber patch cables to the module, ensuring correct TX/RX alignment. Verify link status and speed via the network device management interface and monitor signal LEDs. If necessary, configure interface settings on the switch to enable 1 Gbps operation and check compatibility notes for HP-equivalent modules.

Usage recommendations

Use multimode fiber of appropriate OM grade for the required distance (for example OM2/OM3/OM4) and keep patch cable lengths, connector cleanliness, and proper TX/RX orientation in mind. Confirm firmware or vendor compatibility for third-party transceivers when installing in managed switches to avoid link recognition issues.

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Customer questions

FAQ

How much does the SFP transceiver OEM X121 J4858C_OEM 1G LC SX cost, and is it available for purchase?

The price is 13.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 7 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 01.07.2026 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 OEM 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 OEM 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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

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