3Com Router 3016 Installation Manual page 31

Figure 12 X.21 DCE Cable Assembly
Figure 13 EIA/TIA-449 DTE Cable Assembly
Figure 14 EIA/TIA-449 DCE Cable Assembly
Figure 15 EIA-530 DTE Cable Assembly
Use the following procedure to connect the synchronous/asynchronous cable to
the SERIAL0 interface and the DSU/CSU device:
1 Turn off power to the router.
Caution: Plugging/unplugging the connectors of the synchronous/asynchronous
serial interface online can damage the router or the remote device.
2 Choose the appropriate synchronous/asynchronous cable.
3 Plug the DB-50 adapter of the cable into the SERIAL0 interface of the router.
4 Connect the other end of the cable to the CSU/DSU device. (If the WAN uses a
dial-up line, connect the cable to the serial interface of the analog modem. See
Connecting the AUX Port to the Modem.)
Connecting the Router to the WAN 31