Remembering the first rule of troubleshooting

The first rule of troubleshooting is to keep an open mind. Suspecting that a problem can be attributed to a particular source is fine, but don't be so sure you're right that you lose perspective. All the circuit states I describe in the following sections do suggest a likely source for the problem you're experiencing with your dedicated circuit. Most of the time, for example, a channel in RMB (remote made busy) state is having hardware troubles. However, there is that tiny chance that a glitch within your carrier is causing it to send the channel a message, or triggering the channel to sit in RMB. Alternative scenarios are always possible, not just for channels in an RMB state, but for all the circuit states listed in this tutorial. Use the information to guide your troubleshooting, but don't be so hung up on a single right answer that you dis-count the possibility that something else is causing the issue.