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 192.168.0.114 255.255.255.252
 ip nat outside

The ISP router -> ISR 4321 -> Firewall - 192.168.0.116

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

060761c0-4bb9-4b7c-a0bc-4fe6fc02fef0.jpg
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