ISR 4321 router with NIM-1T card

I have a router configured the Serial as such

interface Serial0/2/0
 description 64K DLC SingTel - 1111005031
 ip address
 ip nat outside

The ISP router -> ISR 4321 -> Firewall -

How do I config the add-on switch card which will connect to the firewall?
Anonymous KHIT EngineerAsked:
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David Johnson, CD, MVPOwnerCommented:
What you have added is a SERIAL port not an Ethernet Port
Anonymous KHIT EngineerAuthor Commented:
Dear Experts, the device I am referring to is this.

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