Amazon.com: Cisco Systems 2503 Enet Dual Serial ISDN Bri Rutr Req. Sw Feat Pk. : Electronics
Cisco 2500 Series Router 2503 and 50 similar items
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Cisco2503 - Knowledge Computers
CISCO2503 Cisco 2503 Router 1 x 10Base-5 AUI 2 x Serial 1 x ISDN BRI
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CISCO2503-CH Cisco 2503 Router 1 x 10Base-5 AUI 2 x Serial 1 x ISDN
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,
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Cisco 2503 - Router Clustering Technology Other Types of Equipment
Cisco Systems 2500 Series Model 2503 Ethernet Router | eBay