cisco switch and fibre

[5nowman]

Hello... Hope you are all well.

 

Kinda out of my depth here.

 

We have fibre going into cabs and then a media converter.

 

https://www.amazon.co.uk/Ethernet-Converter-Multimode-Transceiver-1000Base-SX/dp/B07MQ4LGGQ working at the moment.

 

I want to put this into a cisco switch on either end. I ordered 2 SFP modules and the fibre end bits are too big to go into the module.

Switch = Cisco SG500

 

I ordered this:

https://www.amazon.co.uk/QSFPTEK-Single-Mode-Transceiver-10GBASE-LR-UF-SM-10G-20/dp/B07QJ4ZGXK/

 

 

Can anyone help please?

 

Kind regards.

 

5nowman

[Neil83]

It looks like the converter you have is for an SC fibre connection whereas the SFP+ tranceivers are for an LC connection. Other than changing the fibre cabling to LC you may need to use a converter like this - https://www.amazon.co.uk/Fiber-Adapter-Female-Multimode-Duplex/dp/B001B1DVGC/ref=pd_lpo_3?pd_rd_i=B001B1DVGC&psc=1

[Davit2005]

The media convertors are SC but the SFP is LC. Are you using patch cables. Also the media convertor looks like short range and the sfps look like long range. What fibre cabling have you got in place, do you use patch cables from a fibre patch panel or is it a fibre straight through? Edited June 13, 2022 by Davit2005

[mavhc]

Basically there's multiple types of fiber and multiple types of signals you can send down it, varying in size of the cable, wavelength of light sent down it, single or multi mode, and encoding of the bits. And you have to match them all

 

https://en.wikipedia.org/wiki/Ethernet_physical_layer#1_Gbit/s has more details

[djm968]

Your first step will be to identify what type of fibre has been installed and and how it has been terminated. It will probably be OM3 or OM4 multi-mode and usually terminated onto a patch panel (The SFP module you have purchased is for Single Mode fibre SMF). The next step is to identify what type of connector is installed into the patch panel. This will usually either be LC or SC type connectors. Then you can purchase the correct fibre patch cable to connect directly from the panel to your SFP module. Edited June 13, 2022 by djm968

[5nowman]

Looks like I need to order SC on either end?

They are coming off fibre ports on a patch panel.

 

What do you think?

[5nowman]

Your first step will be to identify what type of fibre has been installed and and how it has been terminated. It will probably be OM3 or OM4 multi-mode and usually terminated onto a patch panel (The SFP module you have purchased is for Single Mode fibre SMF). The next step is to identify what type of connector is installed into the patch panel. This will usually either be LC or SC type connectors. Then you can purchase the correct fibre patch cable to connect directly from the panel to your SFP module.

 

it is terminated like the attached picture

[Davit2005]

You won't get a SFP with SC connection, I've never seen one anyway not to fit a modern switch. Some very old Cisco switches used to have SC connectors but as you can see they are at least double the width of the smaller more modern LC connector.

 

Have a look through the thread and check what others have said. Ideally you want it all to match. The mode at both ends need to match i.e MultiMode (Short Range) or Single mode (Long Range) . You also want to use similar/same cable i.e. 9/125 (OS) , 50/125 (OM2,3,4,5) or 62.5/125 (OM1 but that is old standard) .

 

https://community.fs.com/blog/single-mode-cabling-cost-vs-multimode-cabling-cost.html

 

You can get SC to LC patch cables or use a adapter but I recommend a patch cable with correct connections on each end.

Edited June 13, 2022 by Davit2005

[3s-gtech]

SC to LC patch cables are cheap - just make sure they’re the right spec (there’s compatibility across newer OM standards).

[Chris_Cook]

If you have SC (large square) on the patch panel, and LC (little square) on the SFP, then you need an LC to SC patch cable:

 

https://www.comms-express.com/products/ce-lc-sc-connector-multimode-duplex-fibre-patch-leads/

 

You should check the cable on the back of the panel for the fibre diameter (OM1 - OM4). If it doesn't say, its probably OM1.

 

If the patch panel has LC connectors as well, then you probably need this cable: https://www.comms-express.com/products/ce-lc-lc-connector-multimode-duplex-fibre-patch-leads/