Networking Cable EFB Elektronik K5528BL.3 Blue 3m Cat8.1 S/FTP

The EFB Elektronik K5528BL.3 is a 3 m Cat8.1 S/FTP network patch cable with RJ‑45 connectors at both ends. It supports very high data rates up to 40000 Mbit/s and is designed for short‑reach, high‑frequency Ethernet links such as 25GBASE‑T and 40GBASE‑T over copper. The cable is blue and intended for use where shielded twisted‑pair cabling and low interference are required.

Advantages

This Cat8.1 S/FTP cable provides a frequency range up to 2000 MHz and a maximum recommended transmission length of 30 m for 25GBASE‑T and 40GBASE‑T applications over RJ‑45. The S/FTP shielding (overall foil plus individually shielded pairs) reduces crosstalk and external electromagnetic interference, improving signal integrity in dense or electrically noisy environments. The pre‑terminated RJ‑45 connectors allow plug‑and‑play installation in standard patch panels, switches, and network devices that accept RJ‑45.

Suitable for

• Short‑reach high‑speed links (25GBASE‑T and 40GBASE‑T) within data centers and server rooms
• Backbone or aggregation connections where shielded cabling is required
• Environments with elevated electromagnetic interference where S/FTP shielding is beneficial

When it may not be suitable

This cable is intended for short runs up to around 30 m for the highest data rates; it is not suitable for longer horizontal cabling runs where Cat6A or fiber solutions are preferred. It may also be unnecessary in simple home networks or low‑speed applications where lower‑category, unshielded cables would suffice and cost less.

Key specifications

• Cable length: 3 m
• Category: Cat8.1
• Shielding: S/FTP (overall foil with individually shielded pairs)
• Connectors: RJ‑45 to RJ‑45
• Maximum frequency: up to 2000 MHz
• Maximum recommended transmission distance for 25G/40G: ≈30 m
• Maximum data rate: up to 40000 Mbit/s

How to use

Connect the RJ‑45 plugs to compatible ports on switches, servers, or network interfaces. Route the cable to avoid tight bends and sources of mechanical stress; maintain bend radius recommendations for shielded twisted‑pair cables. Ensure connectors are fully inserted and locked in place. For best performance, use within the specified distance limits and with compatible shielded network equipment and properly grounded infrastructure.

What to consider before purchase

• Required link distance — Cat8.1 is optimized for short runs (around 30 m) at top speeds
• Compatibility with existing equipment — ensure network ports and patch panels support shielded RJ‑45 connections
• Shielding and grounding — S/FTP requires correct grounding practices to realize full EMI protection
• Do you need 25G/40G performance or will lower categories suffice?

Usage recommendations

Use this 3 m Cat8.1 S/FTP patch cable for short, high‑speed connections in data centers or server rooms, keep runs within the specified distance, avoid tight bends, and ensure shielded components are properly grounded for optimal signal integrity.