GBIC Vs SFP --- What Are The Differences?--ETU-LINK

GBIC vs SFP --- What are the differences?

May 17. 2017

Gigabit optical interface modules are fundamental components in modern fiber optic communication and data center interconnection. When customers inquire about gigabit interface modules, SFP is the mainstream choice today, while GBIC was once the dominant standard. This article explains their definitions, differences, and why SFP has replaced GBIC, with reference to industry standards and market data.

What is GBIC?

GBIC stands for Giga Bitrate Interface Converter, was quite popular in 1990s. The design can be used for hot plug, SC interface. It is an interchangeable product conforming to international standards. The Gigabit switch designed with GBIC interface has a large market share in the market due to its flexible exchange. GBIC complies with IEEE 802.3z gigabit Ethernet standards and was widely deployed in carrier-grade and enterprise switches before 2005.

What is SFP?

SFP stands for Small Form-Factor Pluggable, can be simply considered as an upgraded version of GBIC. SFP module is much smaller than GBIC module, you can have more interfaces on the same line card or switch, which is now more common, more use LC interface. The other functions of the SFP module are basically same as the GBIC. Some switch vendors call the SFP module MINI-GBIC. SFP (also called MINI-GBIC) follows SFP MSA (Multi-Source Agreement) industry standards, enabling better compatibility and higher port density.

What Are the Main Differences Between GBIC and SFP?

The other functions of the SFP module are basically same as the GBIC, so what are the differences between them?

※ 1. What Are the Shell and Size Differences?

The shell of GBIC is larger, volume is two times that of the SFP module. GBIC uses the SC interface, while the SFP more uses the LC interface.

※ 2. What Are the Switch Application Differences?

Due to the difference of GBIC and SFP, their application switches are also different. GBIC module corresponding switch is GBIC slot, and SFP module corresponding switch is SFP slot.

※ 3. What Are the Optical Connector Differences?

People who don't contact fiber often might mistakenly assume that the optical connector for GBIC and SFP modules is same, not really. SFP module connect to the LC optical connector, while GBIC connect SC optical connector.

※ Why Has GBIC Been Gradually Replaced by SFP?

These years, due to the small size of SFP, GBIC module is being replaced by SFP module. Why is this happening? Because the size of GBIC is too large, it takes up too much space in the switch, causes no more interfaces to be available on the switchboard panel. However, the smaller size of SFP optical module makes this problem possible.

Take an example: Have you ever heard of a 48 port GBIC line card on 6500 switch? The answer is no, but a 48 port SFP line card exists. According to public market data from Dell'Oro Group and IDC, SFP optical modules have occupied over 95% of the gigabit module market since 2010, while GBIC has been phased out of new equipment design.

How to Choose Between GBIC and SFP Modules?

Hope this blog will give you some understand about GBIC module and SFP module, no longer have doubts about what modules to choose. For new network deployment, SFP is always the best choice for higher port density, lower power consumption, and wider compatibility. GBIC is only used for legacy equipment maintenance.

ETU-Link provides all kinds of SFP optical transceivers, like SFP Copper-T RJ45, GLC-SX-MM SFP, GLC-LH-SM SFP, GLC-LH-SM-40 SFP, GLC-ZX-SM SFP etc,. If any interest, welcome to visit our website: http://www.etulinktechnology.com/.

All optical transceivers will be strictly tested before shipment.

Last updated: April 2, 2026

Get a Quote/Datasheet

If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.