Average Token Round-Trip Time

Overview

• Amount of time it takes for a token to complete one full trip.
• Shows the path the token took.
• Time is measured from when a source receives the token to when it receives it again.
• Average of all the token round trips for every master in the capture.
• Long average round-trip time shows problems that may be consistent every trip.
• Fails if Average Token Round-Trip time is more than 2000ms (2 seconds).
• Warning if Average Token Round-Trip time is more than 85ms (0.085 seconds).

Why it fails

• Problems with wiring.
• There may be a device offline.
• Token disruptions (caused by wiring or devices that are offline).
• Too many masters in the network using the token, holding onto token longer because they have more to say.
• Device(s) that are trying to talk too much.

How to fix it

• Check for token disruptions.
• If there are token disruptions, look for offline devices or check wiring.
• If no token disruptions, sort the drill down to find the device pair with the longest token passing time (sort using Mean (ms))
• Check the configuration of the devices with the longest time with the token.
• Check how busy the device is – it could be overwhelmed

Watch us troubleshoot average token round-trip time in this live troubleshooting webinar of a shopping mall site! Skip ahead to 2:54 for the average token round-trip time diagnostic check.