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# Transmission Delay

JustinLiller.Transmission Delay

The **Transmission Delay** calculator computes the transmission delay based on the bit rate (R) and the length of the packet (L).

**INSTRUCTIONS:** Choose units and enter the following:

- (
**L**) The length of the data packet. - (
**R**) The bit rate

**Transmission Delay (TD):** The calculator returns the delay in milliseconds. However, this can be automatically converted to compatible units via the pull-down menu.

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#### The Math / Science

The formula for Transmission Delay is:

TD = L/R

where:

- TD is the Transmission Delay
- L is the length of the data packet
- R is the bit rate

Assuming that packets are transmitted in a first-come-first-served manner, as is common in packet-switched networks, our packet can be transmitted only after all the packets that have arrived before it have been transmitted. Denote the length of the packet by L bits, and denote the transmission rate of the link from router A to router B by R bits/sec. For example, for a 10 Mbps Ethernet link, the rate is R = 10 Mbps; for a 100 Mbps Ethernet link, the rate is R = 100 Mbps. The transmission delay is L/R. This is the amount of time required to push (that is, transmit) all of the packetâ€™s bits into the link. Transmission delays are typically on the order of microseconds to milliseconds in practice.