cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

Cisco Community Designated VIP Class of 2020

380
Views
0
Helpful
18
Replies
Highlighted
Frequent Contributor

Choosing Fibre cable

           Hi Everyone,

From Fibre Patch Panel to switch which is around 6 feets away which cable should we use Single mode  or Multi Mode?

I read that Multimode is used for shorter distances and can carry more data.

Or does it depend on type of GBIC which we use on switch side?

Office A side is

Switch  module is side is 18  1000BaseX (GBIC)                       WS-X4418-GB   

Gbic on port is 

Type:                  1000BaseSX

Office B  end switch port is

Type:                  1000BaseSX SFP

Both office is connected with fibre within  same building.

Thanks

Mahesh

Everyone's tags (2)
5 ACCEPTED SOLUTIONS

Accepted Solutions
Advisor

Choosing Fibre cable

It is dependant on the GBIC/SFP. The 1000BaseSX is a multi-mode fiber GBIC so you should purchase multi-mode fiber.

As a side note - Single-mode fiber can travel further than multi-mode. Depending on the distance and core size of the fiber determines the amount of bandwidth in can carry and how far it can carry it.

Hope it helps;

View solution in original post

Advisor

Choosing Fibre cable

slow speeds, packet loss, etc Take a look at your interface counters and see if there are a large number of errors.

View solution in original post

Advisor

Choosing Fibre cable

If you're not experiencing any issues then there probably isn't a reason to change it right now. For consistency you may want to swap it out.

View solution in original post

VIP Expert

Choosing Fibre cable

Hi Mahesh,

According to your original post, both site-A and B are using 1000BASE-SX Gbics.  If this is the case, you have to use Multimode fiber with these Gbics.  You can't use Single mode.

Have a look at the diference below:

Cisco 1000BASE-SX GBIC

The  Cisco 1000BASE-SX GBIC (WS-G5484) operates on legacy multimode fiber  (MMF) optic link spans up to 1815 feet (550 m) and on laser-optimized  multimode fiber (OM3) optic link spans up to 3281 feet (1 km).

Cisco 1000BASE-LX/LH GBIC

The  Cisco 1000BASE-LX/LH GBIC (WS-G5486) fully complies with the IEEE  802.3z 1000BASE-LX10 standard. It allows for reaches up to 6.2 miles (10  km) over single-mode fiber (SMF) and up to 550 meters over multimode  fiber (MMF). Note the requirements for mode conditioning patch (MCP)  cords when coupled over legacy MMF: http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html.
More info:

HTH

Reza

View solution in original post

VIP Expert

Choosing Fibre cable

Hi Mahesh,

Yes, since your Gbics are Multimode (SX) your cable from the patch panel to the switch also needs to be multimode.

If your Gbics were single mode (LX) than you would need to use single mode cable from the patch panel to the switch.

HTH

Reza

View solution in original post

18 REPLIES 18
Advisor

Choosing Fibre cable

It is dependant on the GBIC/SFP. The 1000BaseSX is a multi-mode fiber GBIC so you should purchase multi-mode fiber.

As a side note - Single-mode fiber can travel further than multi-mode. Depending on the distance and core size of the fiber determines the amount of bandwidth in can carry and how far it can carry it.

Hope it helps;

View solution in original post

Frequent Contributor

Choosing Fibre cable

Hi Collin,

Thanks for your reply.

We are using on Office A

Patch to switch Multi mode

Office B

Patch to Switch Single mode

Do you  know if this could cause the performance as we are using  both SM  and MM  ?

Thanks

Mahesh

Advisor

Choosing Fibre cable

Yes it can. Is it multi-mode or single-mode fiber between Office A and Office B?

Frequent Contributor

Choosing Fibre cable

Hi Collin,

Between 2 offices it is Multimode.

What type  of performance issue it could cause?

Thanks

MAhesh

Advisor

Choosing Fibre cable

slow speeds, packet loss, etc Take a look at your interface counters and see if there are a large number of errors.

View solution in original post

Frequent Contributor

Choosing Fibre cable

Hi Collin,

I did sh int , sh int counters errors   there were no errors on the interface which has single mode fibre.

Thanks

MAhesh

Advisor

Choosing Fibre cable

Please check both ends. There may not be any errors, but using two different types of fiber may cause problems.

Frequent Contributor

Choosing Fibre cable

Hi Collin,

I checked at interface which has MM  cable found

31 symbol errors found. Symbol error frames are the errors that occur

due to misalignment of encoding at layer 1 31 symbol errors found. Symbol error frames are the errors that occur
due to misalignment of encoding at layer 1.

Do you think it can be due to SM  cable used at other end?

Thanks

MAhesh

Advisor

Choosing Fibre cable

Symbol errors are typically caused by a bad cable or GBIC. 31 errors is not excesive. How long have the interfaces been up and passing traffic?

Frequent Contributor

Choosing Fibre cable

Hi Collin,

Sorry for last  post it was from different  interface.

That interface has no errors.

Interface connected to SM  i found output drops and as per cisco website they are less than .3 %.

Thats all i found on both sides .

So seems as per you i  should change cable from SM  to MM  right?

Thanks

MAhesh

Advisor

Choosing Fibre cable

Are you experiencing any problems?

Frequent Contributor

Choosing Fibre cable

No problems curently.

Only thing is that  other offices have MM  cable all the way to main office.

Only this office has SM cable.

Advisor

Choosing Fibre cable

If you're not experiencing any issues then there probably isn't a reason to change it right now. For consistency you may want to swap it out.

View solution in original post

Frequent Contributor

Choosing Fibre cable

Hi Collin,

May thanks for all your replies in timely manner.

Regards

Mahesh

CreatePlease to create content
Content for Community-Ad