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Q&A for 25G fiber optics

Q&A for 25G fiber optics

Author:Utoptical Date: 10/30/2018

Q&A for 25G fiber optics


The 25G SFP28 uses existing module form factors, such as SFP28 and QSFP28, and allows for a breakout connection that can be configured for 25G per lane or the full 100G without the need to change the port on the front of switches ,this article will focus on Q&A for 25G fiber optics.


Q. What is the maximum support distance for 25G transceivers and cables?

A. The maximum distance supported currently is 25G SFP28 1310nm 10km DOM product. Additional optics may be released in the future to support longer distances on the market.


Q. What is the maximum power consumption of 25G SFP transceivers?

A.  25G SFP28 850nm 100m DOM Transceiver: Max power consumption 1.0W

25G SFP28 1310nm 10km DOM Transceiver: Max power consumption 1.5W


Q. What is the difference between SFP28 and 25G SFP?

A. Actually they are the same. The“SFP” form factor was originally defined as a speed lower than 10G. When it is adopted 10G, the name become SFP+ to indicate the higher overall performance. Later ,the same familiar SFP”form factor is adopted for 25G but the electrical interface must be upgraded to handle 25Gbps/lane. The electrical interface can handle up to 28Gbps, therefore the engineering and industry name is SFP28.


Q. What type of cable is required for 25G Transceivers?

A. 25G SFP28 850nm 100m DOM Transceiver:  Connector Type: Duplex LC (Multimode Fiber OM3 or OM4

25G SFP28 1310nm 10km DOM Transceiver:  Connector Type: Duplex LC (Single-mode Fiber)


Q. Can 10G SFP+ and 1G SFP transceivers be plugged into the associated 25G SFP ports?

A. Yes, associated 25G SFP ports allow the flexibility to run multiple speeds and support a full range of 10G SFP+ and 1G SFP transceivers. There might be some port level restrictions on speed mixing and matching.


Q. Can the port configuration section of 25G SFP transceivers and cables support 10/25G dual rate?

A. Currently 25G transceivers do not support 10G data rate. They only run at 25G data rate.


Q. Can 25G SFP copper cables be used for 10G?

A. Yes, 25G SFP copper cables can be used for 10G, but not vice versa.


Q. Can customers use third party 25G SFP to SFP and QSFP breakout cables?

A.These cables need to comply with the associated IEEE specifications to allow them to be correctly identified and recognized by related switch. Interfaces with cables not recognized correctly will be disabled.


Q. Are brand 25G Transceivers interoperable with third-party 25G transceivers available in the industry?

A. Yes, brand 25G transceivers are fully interoperable as long as third-party 25G transceivers meet the associated industry standard specifications.


Q. What kinds of 25G transceivers and cables are available for Utoptical?

A. Basically, Utoptical supports a full range of copper cables and optical transceivers for 25GbE, compliant to the IEEE standards.

Utoptical offers 25G SFP to SFP copper cables and Active Optical Cables for short reach options, as well as a range of optical transceivers in an SFP form factor for a wide range of fiber types and distance requirements.



Knowing a basic knowledge of SFP28 is essential for you to deploy 25G Ethernet. Utoptical offers customers a wide variety of high-density and low-power 25Gigabit Ethernet connectivity options as well as provides a full range of optical transceivers to meet the needs of various optical fiber type and distance.


If you are interested in UTOPTICAL full range of optical transceivers & cables ,please visit :UTOPTICAL Online Store.

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