What is the difference between transmission delay and Propagation delay?

Question

Furthermore could anyone provide me with examples to illustrate commincation channels dominated by each. Thanks!

Answer 1

Not sure if this is of any help to you but here goes....



Processing delay, examine the header so to figure out where to forward the packet to the next hop, and also possibly for error checking (more detail in Chapter 4 when we discuss router operations). This is typically in the order of microseconds in high-speed routers Queuing delay, waiting to be transmitted in routers, this can be zero, or on the order of microseconds to milliseconds depending on the traffic along the path (route) from the source to the destination.



Transmission delay, assuming the packet length is L (in bits), and link bandwidth (rate) is R (bits per second), the transmission time is L/R, usually microseconds or millisecond. In general, when talking about high-speed network, actually it means the transmission time is very short since R is large.



Propagation delay, distance between two routers (d) divided by the propagation speed (speed of light, s), d/s. In a wide-area network, this is in the order of milliseconds.Please note the difference between transmission delay and propagation delay. Use caravan example to get a more detailed understanding about the difference.Also note the difference between processing delay and transmission delay. Processing delay is nothing to do with the link bandwidth. It is more related to the computation speed.



Also there is another site regarding "TRANSMISSION DELAY VERSUS PROPAGATION DELAY IN A PACKET SWITCHED NETWORK"

Answer 2

transmission time:: I will tell u in laymen way , transmission time is the time required to send sender the last bit of frame. Suppose you have 1 frame of size 10 bit then the time required to send from 1 bit to 10th bit is called as transmission time. and Transmission delay is a function of the packet's length and has nothing to do with the distance between the two nodes. This delay is proportional to the packet's length in bits, It is given by the following formula: DT = N / R where DT is the transmission delay N is the number of bits, and R is the rate of transmission (say in bits per second) Propagation time/delay:: this is the required to reach 1 bit from sender to receiver.and when receiver receive the 10th bit then send the acknowledgement for next frame. Propagation delay = d/s where d is the distance and s is the speed. so for good network propagation time should be less than transmission time. do it yourself otherwise i will post it again.

Answer 3

Transmission delay:



The time from the start of packet reception to the end of packet reception is measured and is called "transmission delay"

(This term is usually used in Packet-Switched Networks)



Propogation delay:



The propagation delay, or gate delay, is the amount of time starting from when the input to a logic gate becomes stable and valid, to the time that the output of that logic gate is stable and valid.

(This term is used in Digital Circuit, Electronics).



For further readings and information please look at the sources listed below

Answer 4

Check the applet from the following link:

http://lerci.tagus.ist.utl.pt/applets/transmission/delay.html



Hope this helps..