Cisco 2500 Series Installation And Configuration Manual page 5

Overview of the Router
Cisco 2521/CPA2521 1 Token Ring shielded twisted pair (STP) port or 1 Token Ring unshielded
Cisco 2522/CPA2522 1 Ethernet port with a selectable AUI connection or 1 Ethernet 10BaseT
Cisco 2523/CPA2523 1 Token Ring STP port or 1 Token Ring UTP port
Figure 1-1, Figure 1-2,
Cisco 2521/CPA2521, Cisco 2522/CPA2522, and Cisco 2523/CPA2523 routers, respectively.
The multiport serial routers function not only as multiprotocol routers but also as communication servers
(see Figure 1-1) for telecommuting services. The multiport serial routers offer high-speed synchronous
serial lines for T1 connections, and low-speed asynchronous/synchronous serial lines to attach terminal
equipment such as a channel service unit/data service unit (CSU/DSU).
Figure 1-1 through Figure 1-4
Figure 1-1: Cisco 2520/CPA2520 Multiport Serial Router--Rear Panel
Figure 1-2: Cisco 2521/CPA2521 Multiport Serial Router--Rear Panel
Figure 1-3: Cisco 2522/CPA2522 Multiport Serial Router--Rear Panel
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twisted-pair (UTP) port
1 ISDN BRI port (RJ-45)
2 high-speed synchronous serial ports
2 low-speed asynchronous/synchronous serial ports
connection
1 ISDN BRI port (RJ-45)
2 high-speed synchronous serial ports
8 low-speed asynchronous/synchronous serial ports
1 ISDN BRI port (RJ-45)
2 high-speed synchronous serial ports
8 low-speed asynchronous/synchronous serial ports
Figure 1-3, and Figure 1-4
show the rear panels of the multiport serial routers.
shows the rear panels of the Cisco 2520/CPA2520,