# SFP transceiver ProLabs J4858C-C 1250 Mbit/s Fiber optic 850 nm

**URL:** https://aio.lv/en/product--oem-by-sansec-j4858d-c--11028896
**Data updated:** 2025-12-30 15:07 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** OEM by Sansec
**Manufacturer code:** J4858D-C
**EAN:** 4053162125483
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 21.49 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 17.76 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--oem-by-sansec-j4858d-c--11028896

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.99 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

The ProLabs J4858C-C is a fiber optic SFP transceiver with a maximum data transfer rate of 1250 Mbit/s. It operates at a wavelength of 850 nm and is designed for reliable network connectivity. The module is compact with dimensions of 45 mm x 20 mm x 115 mm and operates at a maximum voltage of 3.3 V. Ideal for high-speed data transmission in various networking applications.

## Long description

The ProLabs J4858C-C is an SFP fiber optic transceiver designed for reliable 1250 Mbit/s data transmission over multimode fiber at 850 nm. It follows industry MSAs and is manufactured to be compatible with major OEM equipment, offering a standardised form factor for easy integration in switches, routers and media converters. The compact module measures 45 mm × 20 mm × 11.5 mm and operates from a 3.3 V supply.
Advantages
The transceiver is built with high-quality components to ensure consistent performance and interoperability. As an MSA-compliant module, it supports common SFP features and DOM information for monitoring. Its compact SFP package and industry-standard electrical interface allow straightforward replacement or expansion of existing network ports without vendor lock-in.
Suitable for
Short-reach multimode fiber links (850 nm) in data centres and campus networks
Upgrade or replacement of SFP ports on switches and routers supporting 1250 Mbit/s
Use in media converters, storage networking and telecom access equipment
Key specifications
Model: ProLabs J4858C-C (MPN: J4858D-C, EAN: 4053162125483)
Form factor: SFP (small form-factor pluggable)
Data rate: 1250 Mbit/s
Wavelength: 850 nm (multimode fiber)
Power supply: 3.3 V
Dimensions: 45 mm × 20 mm × 11.5 mm
How to use
Insert the SFP transceiver into a compatible SFP slot on the network device until it clicks; ensure the device is powered and configured to recognise the module. Connect appropriate LC-terminated multimode fiber patch cords to the transceiver. Use the host equipment interface for link configuration and monitoring; if available, read DOM parameters via the transceiver management interface.
Usage recommendations
For reliable short-reach performance, pair the ProLabs J4858C-C with OM1/OM2/OM3 multimode fiber and keep patch cord lengths within the specified reach for 850 nm links. Verify compatibility with the host OEM using the device’s supported SFP list when possible.

## Specifications

### Performance

| Feature | Value |
|---|---|
| Interface type | SFP |
| Maximum data transfer rate | 1250 Mbit/s |
| Wavelength | 850 nm |
| Maximum transfer distance | 550 m |
| Tx power (max) | -3.5 dBmW |
| Tx power (min) | -9.5 dBmW |
| Multi-mode fiber (MMF) supported | Yes |
| SFP transceiver standard | SX |

### Network

| Feature | Value |
|---|---|
| SFP transceiver type | Fiber optic |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.031 kg |
| Height | 115 mm |
| Width | 45 mm |
| Depth | 20 mm |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | 0 - 70 |

### Other features

| Feature | Value |
|---|---|
| RX sensitivity | -20 dB |

### Packaging content

| Feature | Value |
|---|---|
| Quantity per pack | 1 pc(s) |

### Power

| Feature | Value |
|---|---|
| Maximum voltage | 3.3 V |

### Features

| Feature | Value |
|---|---|
| Product colour | Silver |

## FAQ

### How much does the SFP transceiver ProLabs J4858C-C cost, and is it available for purchase?

The price is 21.49 € (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 09.07.2026 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. 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 by Sansec 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 by Sansec 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: interface type, maximum data transfer rate, weight, product colour, 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

https://aio.lv/img/cache/product/11028896/64487344_large.webp