Chapter 5: Troubleshooting
General troubleshooting procedure
Page
5-3
General fault isolation process
Effective troubleshooting also requires an effective fault isolation methodology that includes the
following:
•
Attempting to isolate the problem to the level of a system, subsystem, or link, such as
o
AP to SM
o
AP to CMM4
o
AP to GPS
o
Backhaul (BH)
o
Backhaul (BH) to CMM4
o
Power
•
Researching Event Logs of the involved equipment
•
Interpreting messages in the Event Log
•
Answering the questions listed in the following sections.
•
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:
•
What is the history of the problem?
o
Have we changed something recently?
o
Have we seen other symptoms before this?
•
How wide-spread is the symptom?
o
Is the problem on only a single SM? (If so, focus on that SM.)
o
Is the problem on multiple SMs? If so
is the problem on one AP in the cluster? (If so, focus on that AP)
is the problem on multiple, but not all, APs in the cluster? (If so, focus on those APs)
is the problem on all APs in the cluster? (If so, focus on the CMM4 and the GPS signal.)
•
Based on data in the Event Log
o
does the problem correlate to External Hard Resets with no WatchDog timers? (If so,
this indicates a loss of power. Correct your power problem.)
o
is intermittent connectivity indicated? (If so, verify your configuration, power level,
cables and connections and the speed duplex of both ends of the link).
o
does the problem correlate to loss-of-sync events?
•
Are connections made via shielded cables?
•
Does the GPS antenna have an unobstructed view of the entire horizon?
•
Has the site grounding been verified?
Summary of Contents for PMP 450 AP
Page 51: ...Chapter 1 Configuration Quick link setup Page 1 23 ...
Page 155: ...Chapter 1 Configuration Configuring security Page 1 127 ...
Page 163: ...Chapter 1 Configuration Configuring security Page 1 135 ...
Page 164: ...Chapter 1 Configuration Configuring security Page 1 136 ...
Page 193: ...Chapter 1 Configuration Configuring radio parameters Page 1 165 ...
Page 194: ...Chapter 1 Configuration Configuring radio parameters Page 1 166 ...
Page 195: ...Chapter 1 Configuration Configuring radio parameters Page 1 167 ...
Page 206: ...Chapter 1 Configuration Configuring radio parameters Page 1 178 ...
Page 210: ...Chapter 1 Configuration Configuring radio parameters Page 1 182 ...
Page 636: ...Chapter 5 Troubleshooting Logs Page 5 16 Figure 95 SM Authorization log ...
