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.
Time Dependent Calculators
- Time required to process an amount of data at a specific data processing rate
- Amount of time required to transfer an amount of data over a different types of networks
- Number of items (unit-less) produced over time
- Length or distance processed (produce or consume) over time
- Area processed (produced, covered or consumed) over time
- Volume processed (produced or consumed) over time
- Weight or mass processed (produced or consumed) over time
- Speedup Factor (aka Amdahl's Law)
- Compute Data Storage Needed
- Network Propagation Delay
Telecommunications Calculators
- Propagation Delay Computes the delay between two routers based on their positions and a transfer rate.
- Nodal Delay: Computes the nodal delay based on the queuing, processing, transmission and propagation delay.
- End to End Delay Computes the end to end delay based on the number of nodes and the processing, transmission, and propagation delay.
- RF Velocity of Propagation: Computes the RF velocity based on the medium permittivity
- Transmission Delay: Computes the delay based on length of packet and transmission rate.
- Data Transfer Time Calculator Computes the time to transfer an amount of data based on the data transfer rate.
- Simplified Propagation Delay: Computes the delay between two router based on the distance and the transfer rate.
- Surge Impedance Loading: Computes the power loading of a transmission line.
- Amdahl's Law: Computes the total system speedup time based on the improvement of one portion.
- Signal-to-Noise Ratio (SNR) calculator: Computes a relative measure of the strength of the received signal (i.e., the information being transmitted) compared to the noise.
- Compute Data Storage Needed: Computes the approximate amount of data storage needed based on a period of time and a data rate.
- Network Propagation Delay Computes the propagation delay based on the positions of two routers and the propagation speed.
- Shannon-Hartley Theorem: Computes the theoretical upper limit data rate of a channel based on the bandwidth, receiver strength and channel noise.
- Cable dB Loss Budget Computes db loss based on length of fiber run and number of connectors.
- Voltage Resolution (Analog to Digital) Computes the Voltage Resolution of a measured analog signal over the nominal range [VL , VH] with a specified number of conversion bits.
- Effective Isotropically Radiated Power (EIRP): Converts an EIRP measured in mw (milliwatt) to the unitless ratio of dBm (ratio of decibel to 1 milli-unit).
- Length of Cable with Sag: Computes the length of cable between pole accounting for the sag.