Connecting Xenpak LX4 to SFP+

Unanswered Question
Jun 9th, 2010

I am looking at deploying the 4948E switch in my enviroment to replace a 6504 with Sup720 10gig blades. The 6504 is using the XENPAK-10GB-LX4 to connect to my core and the core is using the same Xenpak. I don't want to replace the Xenpaks in my core if I don't have to.The 4948E uses STP+ and there isn't an SFP+ LX4 module. It looks like the XENPAK-10GB-LX4 should connected to the SFP-10G-LRM. Am I correct?

Steve

I have this problem too.
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Tom Randstrom Wed, 06/09/2010 - 13:18

"It looks like the  XENPAK-10GB-LX4 should connected to the SFP-10G-LRM. Am I correct?"

You cannot connect the LX4 to the LRM. 

The LX4 actually transmits 4 optical signals (parallel) versus a single optical signal (serial) for the LRM.  The following Cisco paper discusses the LRM and LX4 interfaces.  

<http://www.cisco.com/en/US/prod/collateral/modules/ps5455/prod_white_paper0900aecd806b8bcb.html>

Unless you can use an 4900 module that uses X2 optics modules with LX4 support, you will have to select another module type for your core switches.

viyuan700 Thu, 06/10/2010 - 11:26

I don't want to replace the Xenpaks in my core if I don't have to

With 4948 with 2 10G you can use XENPAK-10GB-LX4 but not with 4948E.

So if not bought you can compare which make more sene 4949 with Optic module you already have or 4948E with SFP+ modules.

XENPAK-10GB-LX4 will not work with other modules for reason mentioned by Tom.

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