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Friday, December 26, 2025

A Simple Guide to SFPs, DAC Cables, CWDM, DWDM, and Network Speeds (1G to 400G)

When you hear terms like SFP, DAC, CWDM, or 100G, it can feel confusing at first. These technologies are common in data centers, ISPs, and modern enterprise networks.
This guide breaks them down in a simple, practical way that anyone can understand.

SFP, SFP+, SFP28, QSFP - What Are These?

These are small, pluggable modules that go into switches, routers, servers, and transmission devices. They allow network equipment to connect using fiber or copper.