Cisco Systems 520 series manual Adsl Troubleshooting, ATM Troubleshooting Commands, 12-2

Chapter 12 Troubleshooting

ADSL Troubleshooting

ADSL Troubleshooting

If you experience trouble with the ADSL connection, verify the following:

•The ADSL line is connected and is using pins 3 and 4. For more information on the ADSL connection, see the hardware guide for your router.

•The ADSL CD LED is on. If it is not on, the router may not be connected to the DSL access multiplexer (DSLAM). For more information on the ADSL LEDs, see the hardware installation guide specific for your router.

•The correct Asynchronous Transfer Mode (ATM) virtual path identifier/virtual circuit identifier (VPI/VCI) is being used.

•The DSLAM supports discrete multi-tone (DMT) Issue 2.

•The ADSL cable that you connect to the Cisco router must be 10BASE-T Category 5, unshielded twisted-pair (UTP) cable. Using regular telephone cable can introduce line errors.

ATM Troubleshooting Commands

Use the following commands to troubleshoot your ATM interface.

•ping atm interface Command

•show interface Command

•show atm interface Command

•debug atm Commands

ping atm interface Command

Use the ping atm interface command to determine whether a particular PVC is in use. The PVC does not need to be configured on the router to use this command. Example 12-1shows the use of this command to determine whether PVC 8/35 is in use.

Example 12-1 Determining If a PVC Is in Use

Router# ping atm interface atm 0 8 35 seg-loopback

Type escape sequence to abort.

Sending 5, 53-byte segment OAM echoes, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 148/148/148 ms

		This command sends five OAM F5 loopback packets to the DSLAM (segment OAM packets). If the PVC
		is configured at the DSLAM, the ping is successful.
		To test whether the PVC is being used at the aggregator, enter the following command:
		Router# ping atm interface atm 0 8 35 end-loopback
		Type escape sequence to abort.
		Sending 5, 53-byte end-to-end OAM echoes, timeout is 2 seconds:
	!!!!!
		Success rate is 100 percent (5/5), round-trip min/avg/max = 400/401/404 ms
		Cisco Secure Router 520 Series Software Configuration Guide
12-2		OL-14210-01