Cisco Systems PA-4T manual Sending 5, 100-byte ICMP Echoes to 10.10.10.10, timeout is 2 seconds

Checking the Configuration

Following is an example of a successful ping command to a remote server with the address 10.10.10.10:

Router# ping 10.10.10.10 <Return> Type escape sequence to abort.

Sending 5, 100-byte ICMP Echoes to 10.10.10.10, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/15/64 ms Router#

If the connection fails, verify that you have the correct IP address for the server and that the server is active (powered on), and repeat the ping command.

The loopback test allows you to detect and isolate equipment malfunctions by testing the connection between the PA-4T+ interface and a remote device such as modems or CSU/DSUs. The loopback subcommand sends a series of packets out to and through the device (or cable), and back to the PA-4T+ interface. If the packets complete the loop, the connection is good. If not, you can isolate a fault to the remote device or interface cable in the path of the loopback test.

Note You must configure a clock rate on the port before performing a loopback test. However, if no cable is attached to the port, the port is administratively up, and the port is in loopback mode, you do not have to configure a clock rate on the port before performing a loopback test.

Depending on the mode of the port, issuing the loopback command checks the following path:

•When no interface cable is attached to the PA-4T+ interface, or if a DCE cable is attached to a port that is configured as line protocol up, the loopback command tests the path between the network processing engine and the interface port only (without leaving the network processing engine and port adapter).

•When a DTE cable is attached to the port, the loopback command tests the path between the network processing engine and the near (network processing engine) side of the DSU or modem to test the PA-4T+ interface and interface cable.

For complete descriptions of interface subcommands and the configuration options available for Cisco 7200 series routers, Cisco uBR7200 series, and Cisco 7100 series routers, and VIP2 interfaces, refer to the publications listed in the“Related Documentation” section on page vi.

Note The X.21 interface definition does not include a loopback definition. On the PA-4T+, the X.21 DTE interface does not support the loopback function. Because of the internal clock signal present on the PA-4T+ interfaces, loopback will function on an X.21 DCE interface.

8-22PA-4T+ Synchronous Serial Port Adapter Installation and Configuration