If the interface does not have an IP address, obtain a unique address and assign it to the interface with a subnet mask of 255.255.255.0. The ping command is a useful test available on Cisco internetworking devices as well as on many host systems. Cisco internetworking devices provide a mechanism to automate the sending of many ping packets in sequence. Refer to the documentation on Interface Commands for more information. Also, the ping count specification is set to 50.
Type escape sequence to abort.
3.Perform additional extended pings with different data patterns. Verify this by looking at the fifth and sixth line from the bottom of the show interface serial command output. The problem is either a cabling or Telco issue. 6.Remove the loopback plug from the interface and plug the T1 line back into the port. When prompted for a destination filename, press Enter.