[afnog] Cisco sfp module operating temperature

[Mark Tinka]

On Wednesday, February 29, 2012 05:26:11 PM Markus A. 
Wipfler wrote:

> Is it possible to use COM SFP module with router ports
> that require EXT temp range (since COM seems to fall
> into EXT temp range)?

I don't think the restriction is on the router side re: 
temperature, but rather what form factor is required for 
that particular port.

From my experience, all SFP-GE-X Gig-E optics from Cisco are 
classified in the extended operating temperature range, 
while the older GLC-XX-XX are in the commercial operating 
temperature range classifications.

The exception with the GLC-XX-XX optics is the GLC-XX-MMD 
and GLC-XX-SMD. Those are classified as extended operating 
temperature optics with support for DOM.

Of course, none of this matters as your router port will 
determine what you need. Typically, Cisco Catalyst switches 
require the GLC-XX-XX optics, while Cisco routers use the 
SFP-GE-XX optics. I have come across situations where the 
different optical types work in a different platform type, 
but that would normally be an unsupported configuration, 
unless specifically marked as supported, e.g., the in-built 
switch in a Cisco CRS router RP which is used in multi-
chassis deployments for distributed control plane 
processing.

I suppose if your box requires the GLC-XX-XX type modules, 
you can go for the -MMD or -SMD versions which work in 
higher temperatures while offering DOM.

Hope this helps.

Mark.
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