The Nodal Delay calculator computes the sum of the processing, queuing, transmission, and propagation delay in a network.
INSTRUCTIONS: Choose time units and enter the following:
- (Pc) Processing Delay
- (Qd) Queuing Delay
- (Td) Transmission Delay
- (Pg) Propagation Delay
Nodal Delay (Nd): The calculator returns the Total Nodal Delay (dnodal) is milliseconds(ms). However, this can be automatically converted to numerous other time units (e.g. nano or microseconds) via the pull-down menu.
The Math / Science
Nodal Delay, also known as network latency, is the sum of the processing, queuing, transmission, and propagation delay in a network. The formula for nodal delay is:
Nd = Pc + Td + Qd + Pg
where:
- Nd = Nodal Delay (network latency)
- Pc = Processing Delay
- Td = Transmission Delay
- Qd = Queuing Delay
- Pg = Propagation Delay
The contribution of these delay components can vary significantly. For example, dprop can be negligible (for example, a couple of microseconds) for a link connecting two routers on the same university campus; however, dprop is hundreds of milliseconds for two routers interconnected by a geostationary satellite link, and can be the dominant term in dnodal. Similarly, dtrans can range from negligible to significant.
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