# SFP Transceiver Module StarTech J4858CST - 1000BASE-SX 1GbE Multimode LC 850nm 550m DDM

**URL:** https://aio.lv/en/product--startech-j4858cst--431300
**Data updated:** 2026-03-11 11:40 (EET)
**Category:** Network Transceiver Modules
**Manufacturer:** StarTech
**Manufacturer code:** J4858CST
**EAN:** 0065030865289
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 61.99 €
**Prices and availability valid until:** 2026-07-07 23:59
**Price without VAT (21%):** 51.23 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-j4858cst--431300

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

Compatible SFP fiber optic transceiver module for 1 Gigabit Ethernet, model J4858CST by StarTech. Supports 1000BASE-SX over multimode fiber at 850 nm with LC connector and reach up to 550 m. SFP interface, max data rate 1250 Mbit/s, DDM support, aluminium silver housing, typical power 1 W and MTBF about 3,381,761 h. Compact hot-pluggable 1GbE module for switches and routers.

## Long description

The StarTech J4858CST SFP transceiver module provides 1 Gigabit Ethernet connectivity over multimode fiber using the 1000BASE-SX standard. Designed for compatible switches and routers, this compact SFP module supports an 850 nm wavelength, LC connector and a maximum reach of up to 550 m. It is hot-pluggable to enable easy installation or replacement without disrupting network operations and includes Digital Diagnostics Monitoring (DDM) for real-time link and device status.
Advantages
This module delivers reliable 1GbE fiber links with low power consumption and a small SFP form factor that fits standard network equipment. Built in an aluminium silver housing and offering DDM support, it facilitates straightforward monitoring of optical parameters. The transceiver is compatible with common vendor equipment and is backed by StarTech's lifetime warranty and multilingual technical support for long-term use.
Suitable for
 Connecting switches and routers over multimode fiber in campus or enterprise networks
 Upgrading copper links to fiber for improved electromagnetic immunity
 Short- to medium-range backbone or distribution links up to 550 m
 Hot-swappable replacements and spare inventory for 1GbE fiber ports
Key specifications
 Interface type: SFP
 Standard: 1000BASE-SX (1 GbE)
 Wavelength: 850 nm
 Fiber type: Multimode
 Connector: LC
 Maximum reach: 550 m (1804 ft)
 Maximum data transfer rate: 1250 Mbit/s
 Power consumption: typically less than 1.3 W
 Digital Diagnostics Monitoring (DDM): supported
 Housing: aluminium, silver
 Weight: 0.018 kg
 MTBF: approximately 3,381,761 hours
How to use
Ensure the host device supports SFP 1000BASE-SX modules and that multimode fiber with LC connectors is installed. Power down the port only if required by your equipment; otherwise, insert the hot-pluggable transceiver into the SFP slot until it seats securely. Connect the LC fiber patch cable, observe link/activity indicators on the switch or router, and verify link parameters via the device management interface or the module's DDM readings. To remove, disconnect the fiber cable and gently pull the module from the SFP socket following the host equipment instructions.
Usage recommendations
Use OM3/OM4 multimode fiber for optimal performance at longer distances within the specified reach, maintain clean LC connector endfaces to avoid signal loss, and consult host vendor compatibility lists when deploying in branded switches or routers.

## Specifications

### Performance

| Feature | Value |
|---|---|
| Interface type | SFP |
| Maximum data transfer rate | 1250 Mbit/s |
| Networking standards | IEEE 802.3z |
| Duplex system | Full, Half |
| Wavelength | 850 nm |
| Fiber optic connector | LC |
| Maximum transfer distance | 550 m |
| Wavelength-division multiplexing (WDM) | No |
| Digital Diagnostics Monitoring (DDM) | Yes |
| Multi-mode fiber (MMF) supported | Yes |
| SFP transceiver standard | SX |

### Network

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

### Features

| Feature | Value |
|---|---|
| Mean time between failures (MTBF) | 3381761 h |
| Product colour | Silver |
| Housing material | Aluminium |
| Hot-swap | Yes |

### Certificates

| Feature | Value |
|---|---|
| Certification | CE, FCC, UL |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 30 - 75 |
| Storage temperature (T-T) | -40 - 85 |
| Operating temperature (T-T) | 0 - 70 |

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 200 mm |
| Master (outer) case width | 254 mm |
| Master (outer) case length | 305 mm |
| Products per master (outer) case | 36 pc(s) |
| Harmonized System (HS) code | 85369010 |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 46 g |
| Package depth | 93 mm |
| Package height | 33 mm |
| Package width | 119 mm |
| Number of products included | 1 pc(s) |

### Power

| Feature | Value |
|---|---|
| Power consumption (typical) | 1 W |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.018 kg |
| Height | 13 mm |
| Width | 14 mm |
| Depth | 57 mm |

### Sustainability

| Feature | Value |
|---|---|
| Sustainability certificates | RoHS |

## FAQ

### How much does the StarTech J4858CST SFP 1000BASE-SX 1GbE LC 850nm cost, and is it available for purchase?

The price is 61.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 30 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 22.06.2026 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 StarTech 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 StarTech 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.

### Where can I download the instructions for StarTech J4858CST SFP 1000BASE-SX 1GbE LC 850nm?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/431300/54583925_large.webp