User's Guide
Table Of Contents
- PTP 250 User Guide
- 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 in the ODU cable
- Testing the radio link
- Testing link end hardware
- Glossary
Managing performance Chapter 7: Operation
7-20
UNDER DEVELOPMENT
phn-2182_003v004 (Oct 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.