Specifications

CHAPTER

Overview of the Router 1-1

Overview of the Router

The Cisco 2520/CPA2520, Cisco 2521/CPA2521, Cisco 2522/CPA2522, and

Cisco 2523/CPA2523 routers are full-featured multiport serial routers with synchronous

serial, LAN, and asynchronous/synchronous serial ports permitting use as a router or

communications server.

Note Throughout this publication, “the router” refers to the Cisco 2520/CPA2520,

Cisco 2521/CPA2521, Cisco 2522/CPA2522, and Cisco 2523/CPA2523 routers except

when speciﬁed otherwise.

Router Hardware Features

The multiport serial routers are available in the following conﬁgurations:

Cisco 2520/CPA2520 1 Ethernet port with a selectable attachment unit interface (AUI)

connection or 1 Ethernet 10BaseT connection

1 Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI)

port (RJ-45)

2 high-speed synchronous serial ports

2 low-speed asynchronous/synchronous serial ports

Cisco 2521/CPA2521 1 Token Ring shielded twisted pair (STP) port or 1 Token Ring

unshielded twisted-pair (UTP) port

1 ISDN BRI port (RJ-45)

2 high-speed synchronous serial ports

2 low-speed asynchronous/synchronous serial ports