Transmission Delay

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Equation / Last modified by KurtHeckman on 2019/03/01 01:48
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


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 packet’s bits into the link. Transmission delays are typically on the order of microseconds to milliseconds in practice.