ATM Configuration and Troubleshooting Guide

Troubleshooting

Before You Begin Troubleshooting

Chapter 9178

Before You Begin Troubleshooting

Before you start to troubleshoot any part of the ATM product, follow

these steps:

Step 1. Ensure that the switch and cabling (MMF, SMF, or UTPCat5, and 155

Mbits/s or 622 Mbits/s) are appropriate for the type of connector on your

ATM adapter. Consult your switch documentation if necessary.

Step 2. If you are not using a back-to-back connection, ensure that the cable

from the ATM adapter to the switch is connected to both the adapter and

to the switch.

Step 3. If problems arose just after you disconnected the ATM adapter cable and

then reconnected it more than 10 seconds later, wait 10 minutes before

you start the troubleshooting procedures.

Step 4. Ensure that the switch is powered on and is online, and has been

conﬁgured properly.

Step 5. Ensure that the remote system is connected and online, and has been

conﬁgured properly.

Step 6. Ensure that the switch port conﬁguration is consistent with that of the

ATM adapter to which it is connected. The following parameters must be

conﬁgured to identical values on both the ATM adapter and the switch

port to which it is connected:

• The physical layer (Sonet or SDH).

• The UNI version.

• The ILMI VPI and ILMI VCI values.

Step 7. If you are using a back-to-back connection, ensure that the cables are

connected properly (see “Creating a Back-to-Back Connection” on

page 86).

Step 8. Check the LEDs for hardware and link integrity. This is described in the

hardware installation guide for your ATM adapter.

Step 9. Ensure that you have not exceeded the limitations described in “Trafﬁc

Conﬁguration Limitations” on page 64.