I have a Cisco 2620 Router.

It comes with one fast ethernet port built in (circled in red), and one old AUI ethernet module is installed (circled in blue).

I figure I can put a transceiver on the AUI interface to get a second RJ45 connector. What I'd really like to have is a second fast ethernet connector.

The ideal candidate to achieve this would be the NM-1FE-TX module.

Cisco claims on their website that this module is not suitable for the Cisco 2620 and Cisco 2620XM. It says so in "Table 2 Physical Limitation of Serial Modules per Chassis".

Indeed, this module was designed for the 3600 series of routers. I've seen claims on the internet, however, of people having this module on a 2620XM, and it being fully functional.

This claim gains some credibility because of the fact that in Cisco's own Packet Tracer software, you can install this module on the 2620XM router.

I'm looking for a definitive answer.

Will this module work on a Cisco 2620? Is there perhaps another way to get a second fast ethernet port on this device?