![My grandfather gave me a Cisco 2500 series router and it looks like it predates Ethernet. How can I get this working? What are all these ports, what signals do they use, My grandfather gave me a Cisco 2500 series router and it looks like it predates Ethernet. How can I get this working? What are all these ports, what signals do they use,](https://i.redd.it/tikgjcqfvqi61.jpg)
My grandfather gave me a Cisco 2500 series router and it looks like it predates Ethernet. How can I get this working? What are all these ports, what signals do they use,
![Dez Blanchfield on Twitter: ". #FlashBack remember the @CISCO 2501 ;-) oh them's were the days!! #internet #business #technology #computer #design #art #o #web #tech #google #software #communication #cisco #router #2501 #serial # Dez Blanchfield on Twitter: ". #FlashBack remember the @CISCO 2501 ;-) oh them's were the days!! #internet #business #technology #computer #design #art #o #web #tech #google #software #communication #cisco #router #2501 #serial #](https://pbs.twimg.com/media/DqztzNhXQAAjvX5.jpg)
Dez Blanchfield on Twitter: ". #FlashBack remember the @CISCO 2501 ;-) oh them's were the days!! #internet #business #technology #computer #design #art #o #web #tech #google #software #communication #cisco #router #2501 #serial #
![CISCO2501 - CISCO CISCO2501 (2501) 2501 ROUTER W/1 ETHERNET PORT 2 SERIAL PORTS - serverevolution.com CISCO2501 - CISCO CISCO2501 (2501) 2501 ROUTER W/1 ETHERNET PORT 2 SERIAL PORTS - serverevolution.com](https://serverevolution.com/media/catalog/product/cache/b2c0a4040973804548ad6701262dcef4/s/e/se_cisco2501.jpg)