Roundtrip Time
The round-trip time or ping time is the time from the start of the transmission from the sending node until a response (for example an ACK packet or ping ICMP response) is received at the same computer. It is affected by packet delivery time as well as the data processing delay, which depends on the load on the responding node. If the sent data packet as well as the response packet have the same length, the roundtrip time can be expressed as:
- Roundtrip time = 2 * Packet delivery time + processing delay
In case of only one physical link, the above expression corresponds to:
- Link roundtrip time = 2 * packet transmission time + 2 * propagation delay + processing delay
If the response packet is very short, the link roundtrip time can be expressed as close to:
- Link roundtrip time ≈ packet transmission time + 2 * propagation delay + processing delay
Read more about this topic: Transmission Time
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