I am trying to find out if the 8 ports in the 4900M chassis will support the TwinGig module? I have looked through all of the documentation that I could find and I do not see where this is addressed. Here is what I have found;
The installation manual ( http://www.cisco.com/en/US/docs/switches/lan/catalyst4900/4900M/installation/guide/4900M2.pdf ) specifies "On the WS-4908-10GE modules only, TwinGig converter modules may be used in place of X2 modules...."
However it doesn't address the 8 ports on the chassis. I am going to assume you cannot use them but does anyone know why? I am dissapointed that I missed the "Ask the experts" discussion with Kenny Lei, I am sure he would of been able to answer my question.
I just saw in the data sheet for the 4900 series that the twingig modules are not supported on the chassis. Table 4 of the page:
It doesn't explain why, but it's either a technical reason or a marketing reason. :-)