Cisco 3750 - Fiber Connectivity

I am going to connect 6 WS-C3750V2-48PS-S switches on fiber for my 4 floor building,

below is my requirements:

All switches should get connected each other with redundant link (if one fiber cable is damaged second one should be available as a backup, so we will have the redundant link with each floors (not the redundant switch on each floor)

Kindly clarify my some queries as below:

1. My cable vendor shipped me single mode fiber cable for interconnecting the switches, so is this cable fine or do I have to go for mulimode fiber cable?

2. My cable vendor says ... you have to use SC-LC single mode Duplex adapter=is it correct? as cisco 3750X / 2960S SFP module will be compatible with LC connectors=True?

3. What SFP module I have to order if I have to go for 1G or 4G fiber = SC or LC? confused?

4. My cable vendor says ...you have to use SC/PC Pigtail OS2 PVC 1.5 m  + SC to LC fiber connector...so what does he exactly mean by this?,,, &.. what I understood is...my 2960S switch connect as below:

Cisco2960--->SFP--->---LC connector--->----fiber---------> SC/PC Pigtail <----------fiber------------ LC connector---< ----Cisco3750X   ( pls correct if I am wrong anywhere)

5. As 3750X comes with 12 fiber ports + 4 extra modules ports so all my 6 switches(6X2=12ports = pls refer to the attached net-diagram) will get connected with each switch with redundant link but can i use 4 extra ports to connect my 2 physical server with this switch = if yes...what I have to use to get it connected?

3. For 1G, 1000BASE-LX/LH (GLC-LH-SM). 10G would be SFP-10G-LR

4. if you are connecting back to back and this is within the same room I would say save some money and go with a long patch cable to connect the two directly. If there is a room or a floor between the two devices I would recommend a patch panel so that you can make changes in the future. This will accommodate hardware changes and moves.

5. Yes, you should be able to, but you still need to match the SFP type, or more specifically the frequency.

The above would be straight answers without throwing you any curves. But here's a slight curve. If none of the closets are further apart than 300M, you may be better off going with 50um MM fiber (OM3 or OM4). It's not so much that the fiber will save you money, but the price difference in SFP's is huge when it comes to 10G

As of today, list price is:

SFP-10G-LR=  3,995.00 (Single Mode)

SFP-10G-SR= 1,495.00 (Multi Mode)

When you multiply that out by the minimum 12 SFP's (just to get to your switches) that's a big difference - 47,940.00 for SM versus 17,940 for MM.

Use the links below to see the specs for different types of Cisco optics. When I say that you need to match the "type", I really mean the frequency. Frequency usually equates to a "type" like LR, SR, LX, LH, etc. Please excuse my use of the word type when referring to SFP's as it can be misleading.

For example, Cisco SFP-10G-SR has a frequency of 850nm, and Cisco FET-10G also has a frequency of 850nm. They do not have the same name, and do not serve the exact same purpose (the purposes are for a completely different topic), but they are compatible to communicate with each other directly because the frequency matches. This is a common pairing when using Nexus switches.

I would be willing to bet that the server fiber cards run at 850nm which means the SFP-10G-SR would be compatible and can use any of the listed fiber types within the distance limitations.

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/data_sheet_c78-455693.html

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885.html

For more Cisco WS-C3750X-48T-L information please click here