# QSFP28 to SFP28 Breakout Cable Overview and Applications

## Introduction to QSFP28 and SFP28 Interfaces

The QSFP28 (Quad Small Form-factor Pluggable 28) and SFP28 (Small Form-factor Pluggable 28) are two important interface standards in modern high-speed networking. QSFP28 supports data rates up to 100Gbps (4×25Gbps or 1×100Gbps), while SFP28 supports 25Gbps or 28Gbps per lane.

## What is a QSFP28 to SFP28 Breakout Cable?

A QSFP28 to SFP28 breakout cable is a specialized interconnect solution that allows a single QSFP28 port to connect to four SFP28 ports. This cable effectively “breaks out” the four 25Gbps lanes of a QSFP28 interface into four separate SFP28 connections.

## Key Features of QSFP28 to SFP28 Breakout Cables

– High-speed data transmission (up to 25Gbps per channel)
– Low power consumption
– Hot-pluggable capability
– Flexible cable lengths (typically 1m to 5m)
– Passive copper or active optical options
– Cost-effective alternative to multiple discrete transceivers

## Common Applications

### Data Center Networking

QSFP28 to SFP28 breakout cables are widely used in data centers to connect high-density 100G switches to 25G servers or storage devices. This allows for efficient utilization of switch ports while maintaining high bandwidth.

### High-Performance Computing

In HPC environments, these cables enable flexible connectivity between compute nodes and network infrastructure, supporting demanding applications that require high bandwidth and low latency.

### Network Upgrades

When migrating from 10G to 25G infrastructure, breakout cables provide a transitional solution, allowing new 25G equipment to connect with existing 100G switches.

## Advantages Over Alternative Solutions

Compared to using multiple discrete transceivers and fiber patch cables, QSFP28 to SFP28 breakout cables offer:

– Simplified cabling management
– Lower overall cost
– Reduced power consumption
– Better signal integrity over short distances
– Easier installation and maintenance

## Considerations When Choosing a Breakout Cable

When selecting a QSFP28 to SFP28 breakout cable, consider:

– Cable length requirements
– Passive copper vs. active optical options
– Compatibility with specific equipment
– Operating temperature range
– Bend radius and physical space constraints

## Future Outlook

As network speeds continue to increase, breakout cable technology will evolve to support even higher data rates while maintaining backward compatibility. The demand for these solutions is expected to grow as more organizations adopt 25G and 100G networking infrastructure.