cisco 3925 looking for Gig ethernet card recommendation

[tonnesen]

I am looking to add 2 Gig ethernet ports into one of the card slots of the cisco 3900 router. I was given the following two part numbers and these look like serial ports NM-1T3/E3 or Vwic3-2MFT T1/E1. Comments please

[Leo Laohoo]

Exactly what are you trying to do?  What are these "2 Gig ethernet ports" going to be connected to?

[tonnesen]

they will be used for connecting to other networks

[Joseph W. Doherty]

https://www.cisco.com/c/en/us/products/collateral/routers/2900-series-integrated-services-routers-isr/data_sheet_c78-709155.html

The above will provide two routed gog ports, although on any 3900, the router doesn't have the performance to guarantee even one gig port at wire-speed.