User's Manual
Table Of Contents
- PTP 250 User Guide
- Copyrights
- Safety and regulatory information
- Contents
- List of Figures
- List of Tables
- About This User Guide
- Chapter 1 Product description
- Chapter 2 Planning considerations
- Chapter 3 Legal information
- Chapter 4 Reference information
- Chapter 5 Installation
- Chapter 6 Configuration and alignment
- Chapter 7 Operation
- Chapter 8 Troubleshooting
- Testing link end hardware
- Testing when PoE LEDs do not illuminate correctly
- Testing after a lightning strike
- Test flowcharts
- AC LED is off
- AC LED is flashing
- PORT LED is off
- PORT LED is flashing
- Test Ethernet packet errors reported by ODU
- Test Ethernet packet errors reported by managed switch or router
- Test ping packet loss
- Test resistance at the PoE end of the drop cable
- Testing the radio link
- Testing link end hardware
- Glossary
Managing performance Chapter 7 Operation
phn-2182_002v000
7-20
May 2011
Checking the retry histogram
The retry histogram gives an indication of wireless quality. It records how many
frames have been re-transmitted how many times. Valid values can vary; a short range
LOS link should run with very few retries. A longer range nLOS link may run with up
to 10% retries.
To check the retry histogram, select menu option Statistics, Retry Histogram. The
Retry Histogram page is displayed (Figure 7-10).
Figu
re 7-10 Retry Histogram page
To reset all retry statistics, select Reset Histogram Statistics.