Wired Intelligent Edge (Campus Switching and Routing)

Occasional Contributor II

SFP 10G compatible 1G



Are SFP 10G backward compatible with 1G speed ?


One of our customer has some errors on fiber link and suspect it is not compatible with such speed and asks to downgrade speed in the configuration.


Is it possible or should I recommend to swap 10G SFPs with 1G SFPs on this uplink ?


Many thanks


MVP Expert

Re: SFP 10G compatible 1G

AFAIK a SFP+ (read: SFP Plus) Transceiver goes at 10 Gbps Full Duplex, not any lower speed like 1 Gbps (a SFP Transceiver - withouth the Plus suffix - works at 1 Gbps Full Duplex), so you can't down rate a 10 Gbps SFP+ Transceiver's port speed as you would do on a typical RJ45 10/100/1000 Mbps copper port (the SFP/SFP+ Transceiver sets the speed and the Switch slot in which that Transceiver is inserted lets it to communicate with other switched ports, you can't change the Full/Half Duplex Mode or the Speed).


So if you're using a SFP+ Transceivers pair the fiber optical link should be up at 10 Gbps Full Duplex (provided that the Fiber Optic link is clean OK).


The only way to go at 1 Gbps Full Duplex is not using a SFP+ Transceiver but using, instead, a SFP one.


Which SFP+ Transceiver(s) and which Switch(es) are you working on exactly (HPE/Aruba SKUs would help)?

Contributor I

Re: SFP 10G compatible 1G


Do you mean all Aruba switches or WLC that support SFP+, can use either SFP or SFP+ transceiver


New Contributor

Re: SFP 10G compatible 1G

We have an Aruba 2930, would that be able to use a 1G SFP module?



Aruba Employee

Re: SFP 10G compatible 1G



Yes, according to ArubaOS-Switch Transceiver Guide (link below - page 28), 1G SFP module (J4858C) is supported by Aruba 2930 Switches.




Thank You,

Priyank Patel
MVP Expert

Re: SFP 10G compatible 1G



There is also a newer revision of the same transceiver (J4858D) which is also compatible, and listed in a just-published revision of the same guide.

Matt Fern
Technical Marketing Engineer, Wired Intelligent Edge

Aruba, a Hewlett Packard Enterprise company

T: 916.540.1759  |  E: mfern@hpe.com   |   Matt @ Twitter
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