ePMP: Troubleshooting you ePMP solutions - Where to start

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




What is the history of the problem?

·       Have we changed something recently?

·       Have we seen other symptoms before this?


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.)


Based on data in the System Log

·       Is intermittent connectivity indicated? (If so, verify your configuration, power level, CINR, cables and connections, and the speed duplex of both ends of the link).

·       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?