Cisco 2611 - Router - EN User Manual page 35

Serial Connections
Figure 2-13 shows the serial transition cables you can connect to the DB-60 port on the
asynchronous/synchronous serial modules and serial WAN interface card.
Figure 2-13 Serial Interface Adapter Cables
Router connections
EIA/TIA-232 EIA/TIA-449 V.35 X.21 EIA-530
Network connections at the modem or CSU/DSU
Preparing to Install the Router 2-21