Effective troubleshooting depends in part on measures that you take before you experience trouble in your network. Cambium recommends the following measures for each site:
Procedure:
1 |
Identify troubleshooting tools that are available at your site (such as a protocol analyzer). |
2 |
Identify commands and other sources that can capture baseline data for the site. These may include: · Ping · tracert or traceroute · Throughput Test results · Throughput data · Configure GUI page captures · Monitor GUI page captures · Session logs |
3 |
Start a log for the site, including: · Operating procedures · Site-specific configuration records · Network topology · Software releases · Types of hardware deployed · Site-specific troubleshooting process · Escalation procedures · GPS latitude/longitude of each network element |
General Fault Isolation Process
Effective troubleshooting also requires an effective fault isolation methodology that includes
- Attempting to isolate the problem to the level of a system, subsystem, or link, such as
- AP to SM
- AP to CMM
- AP to GPS
- CMM to GPS
- power
- Researching System Logs of the involved equipment.
- Answering the questions listed in the following section.
- Reversing the last previous corrective attempt before proceeding to the next.
- Performing only one corrective attempt at a time.
Questions to Help Isolate the Problem
When a problem occurs, attempt to answer the following questions:
1 |
What is the history of the problem? · Have we changed something recently? · Have we seen other symptoms before this? |
2 |
How wide-spread is the symptom? · Is the problem on only a single SM? (If so, focus on that SM.) · Is the problem on multiple SMs? If so: o is the problem on one AP in the cluster? (If so, focus on that AP) o is the problem on multiple, but not all, APs in the cluster? (If so, focus on those APs) o is the problem on all APs in the cluster? (If so, focus on the CMM and the GPS signal.) |
3 |
Based on data in the System Log · Is intermittent connectivity indicated? (If so, verify your configuration, power level, SNR, cables and connections, and the speed duplex of both ends of the link). · Does the problem correlate to loss-of-sync events? |
4 |
Are connections made via shielded cables? |
5 |
Does the GPS antenna have an unobstructed view of the entire horizon? |
For more information on troubleshooting SM registration, see: How to Troubleshoot STA Registration
For guidelines on testing radio links with Communication or Reliability Challenges, see: Guidelines for Testing Radio Links with Communication or Reliability Challenges