Cisco Ethernet 4-Port Serial ISDN Router
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The Cisco Ethernet 4‑Port Serial ISDN Router (often sold under product codes like Cisco 2520-CH) is a legacy, rack-mount device tailored for small office or remote deployments using ISDN and serial connectivity. This platform includes 1 Ethernet port, 4 serial WAN ports, and an ISDN BRI interface, enabling simultaneous support for Data, X.25, Frame Relay, PPP, and legacy protocols like SDLC and BSC over ISDN or serial WAN links. Based on a Motorola 68030 CPU, it delivers approximately 2.2 Mbps throughput (≈4,400 pps)—sufficient for early enterprise routing and dial-on-demand scenarios. The device supports SNMP, Telnet, Cisco IOS-based routing, and classic protocols like OSPF, RIP, EGP, IGRP, and PPP authentication, making it an economical choice for users with ISDN infrastructure retention or vintage routing requirements
