how do you know wich series uses fiber module that have lc or Sc connection. cause I was @ the site and we had some cable ends issue. one end Lc to SC and the other is SC to SC.. But how I will know what is the hardware required for the rtr/switch so I can order the correct modules and advise the vendor to make the right cable ..
You need to look at the data sheets for the switch model and these will tell you what type of fibre connectors are supported.
If you go under "Product & Services" from Cisco home page and then select "Switches" then the model you are interested you can then look at the data sheets.
Attached is a link to data sheet for 4948 switches. Have a look at Table 2 which shows what type of fibre connectors are available on each model.