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X2-10G-LX4 and SFP-10G-SR

Hi

Issue 1

I have a 6506-E with WS-X6708-10Gig Modules and i have installed X2-10G-LX4 transceiver on them, on the other side i have a UCS 6120 and installed a SFP-10G-SR.

The link between the 2 does not come up,  what could be the reason for that? The distance between the 2 is 10 meters and i have already tried changing the cables.

Issue 2

If i connect the WS-X6708-10Gid module with X2-10GB-LR module and connect it to X2-10GB-LR on another 6506-E, the link comes up. that means there is no problem with the Module or the ios on the switch.

but if connect X2-10GB-LX4 on 6506-E and X2-10GB-LX4 on the other side, the link does not come up. Any clue what could be the reason ? I have already tried changing the transceiver.

Can someone please help ?

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

X2-10G-LX4 and SFP-10G-SR

"LX4 is only made for Multimode fiber and it is not going to work  on single mode fiber no matter what you try (as you are saying link is  not comming up)."

Not entirely true.

In the link below:

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html

Notes for LX4:

"Another alternative for short reaches within the  same location is to use a single-mode patch cable. There will be no  saturation over single-mode fiber."

X2-10GB-LX4 can be connected to another X2-10GB-LX4 over short distances with a single-mode fiber.

Additional reference: https://supportforums.cisco.com/thread/2130959

4 REPLIES
Hall of Fame Super Gold

Re: X2-10G-LX4 and SFP-10G-SR

The Cisco 10GBASE-LX4 Module supports link lengths of 300m on standard FDDI grade MMF. To ensure that specifications are met, the transmitter output should be coupled through a mode conditioning patch cord. For additional information on mode conditioning patch cord requirements please see: http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html.

Re: X2-10G-LX4 and SFP-10G-SR

Issue #1 - X2-10G-LX4 transceiver to SFP-10G-SR transceiver.

These two modules are not compatible with each other.  The LX4 interface actually uses four (4) data streams (wavelengths) across each of the two MMF fibers, while the SR interface uses a single data stream on each of the two fibers.  If you have 10m of FDDI grade MMF, you will need either two LX4 interfaces or two SR interfaces to get the system to work.

Issue #2 - X2-10GB-LX4 transceiver and X2-10GB-LX4 transceiver.

As suggested by an earlier post, the requirement is for a Mode Conditioning Patch Cord (62.5 micron MMF) to be installed on each transmitter for proper operation.

Hope this helps!

Tom

Silver

Re: X2-10G-LX4 and SFP-10G-SR

issue 2

If i connect the WS-X6708-10Gid module with X2-10GB-LR module and connect it to X2-10GB-LR on another 6506-E, the link comes up. that means there is no problem with the Module or the ios on the switch.

but if connect X2-10GB-LX4 on 6506-E and X2-10GB-LX4 on the other side, the link does not come up. Any clue what could be the reason ? I have already tried changing the transceiver.

You have got answer for first issue that LX4 cannot work with SR. By the way what kind of fiber you have Single Mode/Multimode?

second issue,

If your X2-10GB-LRmodule have worked then i can assume that you have single mode fiber for testing as LR is only for Single mode fiber .

LX4 is only made for Multimode fiber and it is not going to work on single mode fiber no matter what you try (as you are saying link is not comming up).

Cisco X2-10GB-LRM is the only module which can work for Single mode and Multimode (ofcourse you need Mode conditioning patchchord )

Cisco Employee

X2-10G-LX4 and SFP-10G-SR

"LX4 is only made for Multimode fiber and it is not going to work  on single mode fiber no matter what you try (as you are saying link is  not comming up)."

Not entirely true.

In the link below:

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html

Notes for LX4:

"Another alternative for short reaches within the  same location is to use a single-mode patch cable. There will be no  saturation over single-mode fiber."

X2-10GB-LX4 can be connected to another X2-10GB-LX4 over short distances with a single-mode fiber.

Additional reference: https://supportforums.cisco.com/thread/2130959

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