Cisco SFP Question

[niyatioxe]

Good evening folks, question for you:

Am I crazy, or does Cisco not have a 10G LC mm SFP that that can also be adjusted to handle 1Gb/100Mb/etc. ?

We have a large project at work that is fully 10G LC fiber; however, we want the capability to connect to 1Gb devices. All the connectors we have Cisco 10G-SR-S which are locked in at 10G and not connecting with slower 1Gb devices. I pop in a 1Gb gbic and it works perfectly, hoping there is an SFP that can do it all.

[Kasun Bandara]

Hi,

actually that is not possible. both sides need to match same speed in optical world. with few exceptions.

[balaji.bandi]

No its not possible, it is the major requirement, you need to look for converters high to lower SOF or Ethernet.

or stick with 1GB SFP.

[Marvin Rhoads]

SFPs (and SFP+ and QSFP etc.) generally use either lasers (single mode) or various types of LEDs (multimode). The optics in either case are fixed speed and built that way to make them as efficient and inexpensive as possible.

That is fundamentally different than copper interfaces whose speed can be auto adjusted by just changing the electrical signalling rate.