Thanks for your answer. Well I am using MultiMode fiber. This is only what we have here on site

. We do not use single mode.

But the multi mode is functionning on the LH-SM but not on the SX-MM.

Manu

Thanks for your answer.

I am using

GLC-LH-SM << multimode fiber >> GLC-LH-SM   and this is working (with connector in between).

GLC-SX-MM << Multimode fiber >> GLC-SX-MM and this is not working

Note: on the network (not the lab I am on), we use 1000 Base -SX and this is working. Basically we want to increase the number of switches on the network with some 2960 and some 2960S and we want to use SX-MM.

So as our business doesn't use Single mode fiber, and only has multi mode fiber, we should not buy SX-MM, isn't it ?

Shall we use the LH-SM (but the distant required is not more than 300 meters) or are the 1000 Base-SX still available ? (I will check that with our suppliers).

Thanks again. Hopefully I explained the above correctly.

Manu

GLC-SX-MM should work if you are using it within the spec (the link in my previous post). If you are using 62.5 micron fiber, it needs to be within 275 ft. 50 micron can go much longer. Have you test that with only a patch cord? Have you check your switch's CLI to see if the switch sees the SFP module?

Regards,

jerry

Thanks Jerry,

Yes I have read the link you sent me. I am doing an internship here in the business for 1 week now so I don't have all the detail. But on lab, I have a fiber with a connection in between. The technical service told me that this is multimode they have here. Now I am starting to doubt about it as this is working with the LH-SM and not with the SX-MM.

On the fiber this is not showing what it is. Is there a way to find out easily if this is multi or mono mode. Sorry I am not an expert in fiber and just discovering about it now.

Manu

I see. On the fiber, usually the spec is printed on it, when you find it just put them here so we can take a look.

Another way to ID the fiber is tell me the color. Usually, MMF is in ORANGE (62.5 micron) or AQUA (50 micron), SMF is in Yellow.

Regards,

jerry

Thanks so much jerry,

Here is what I have on the fiber :

"optronics 62.5/12.5 mm d62 zipro"    (so I think this is multi mode = mm ??) - the cable is orange.

If this is multi mode, then I don't see why the SX-MM won't work ?

Manu

Yes, it is a MMF and it should work with the GLC-SX-MM. Have you look at the switch's CLI or change to a different SFP to see it works or not? BTW, are those Cisco branded SFP?

Regards,

jerry

Thanks for your answer.

Yes they are all Cisco's ones. I have 10 of them and tested all of them but nothing !!!! So maybe I should get new ones from the supplier and check again. I don't know if those are good ones or not as I don't have another place to check them. I have checked few ones on a switch 2960 connected on the network but it was still KO. (we have 1000 Base SX on the network and working well).

Well if nothing more ?? I can check, I appreciate your replies and help. I did learn quite a bit with this.

Manu

It is very odd that 10 of them are not working. I would suggest you to check your fiber also. I am assuming the switch configuration works with the GLC-LH-SM SFP?

I agree that this is odd that 10 of them don't work.

Yes the config for both switch are fine and the connection is OK with the GLC-LH-SM. I have not checked the fiber yet but this is not working neither on site where connection is OK with the 1000Base SX.

So, I am a bit confused here !!!???? Maybe I should reboot the switch ? what do you think ?

(By the way, do you know of a link for a good dictionnary for cisco terms. I am having some hard time some times finding the meaning for abrevation like SX ou GLC and others).

You can give it a try on rebooting the switch. The SFP is hot swappable and usually there is no need to reboot the switch.

Those are really part number, it should be in the link from my previous post.

Regards,

jerry

Hello,

Good morning from France.

I checked few more thing. With GLC-SX-MM connected, I did a show interface .... and it did not see it (normal as there is no connexion). Then it says media type 10/100/1000 Base TX for the type of media that can be connected. My question is then   "the SX-MM should be fine isn't it ?"

Apparently there is a switch with the SX-MM connected somewhere on the network so I am going to try to replace them with the LH-MM temporaly and try them on my lab here. I will let you know.

Manu