- published: 23 Jun 2011
- views: 31950
OWD redirects here. For the use in diving, see Open Water Diver
One-Way Delay, abbreviated as OWD, is a common term in IP network monitoring, and differs from Round-Trip Time (RTT).
The ping utility calculates the RTT, that is, the time to go and come back to a host. This does not assure that the go and back paths are the same in terms of congestion, number of hops, or Quality of Service (QoS).
In order to avoid such problems, OWD concept comes into play. The One-Way Delay value is calculated between two synchronized points A and B of an IP network, and it is the time in seconds that a packet spends in travelling across the IP network from A to B. The transmitted packets need to be identified at source and destination in order to avoid packet loss or packet reordering.
The measurement method makes obvious that this value is substantially different from the Round-Trip Time/2 value.
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