Cisco 2501 1-Port Wired Router (CICSO2501) for sale online | eBay
CISCO2525-1 Cisco Routers
Cisco Cisco 2501 Cisco 2500 Series Router | RecycledGoods.com
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,
Amazon.com: Cisco 2501 Dual Serial Router (CISCO2501) : Electronics
Cisco 2500 Router products
2501-16M Cisco 1 x AUI LAN 16MB Flash Serial Ethernet Router (Refurbished)