Propagation Delay vs Transmission delay

Question

Recall that propagation delay d s is the time to transmit one bit over a link  And transmission delay is the time to transmit a whole packet over a link  Then  why isn t packet length   propagation delay   transmission delay

User · Answer

Transmission Delay   Amount of time required to pump all bits packets into the electric wire optic fibre    Propagation delay   It s the amount of time needed for a packet to reach the destination   If propagation delay is very high than transmission delay the chance of losing the packet is high

User · Answer

The transmission delay is the amount of time required for  the router to push out the packet   The propagation delay  is the time it takes a bit to propagate from one router to the next   the transmission and propagation delay are completely different  if denote the length of the packet by L bits  and denote the transmission rate of the link from first router to second router by R bits sec  then transmission delay will be L R  and this is depended to transmission rate of link and the length of packet   then if denote the distance between two routers d and denote the propagation speed s  the propagation delay will be d s  it is a function of the Distance between the two routers  but  has no dependence to the packet s length or the transmission rate of the link

User · Answer

Because they re measuring different things   Propagation delay is how long it takes one bit to travel from one end of the  wire  to the other  it s proportional to the length of the wire  crudely    Transmission delay is how long it takes to get all the bits into the wire in the first place  it s packet length data rate

User · Answer

Transmission Delay    This is the amount of time required to transmit all of the packet s bits into the link  Transmission delays are typically on the order of microseconds or less in practice        L  packet length  bits     R  link bandwidth  bps     so transmission delay is   L R   Propagation Delay    Is the time it takes a bit to propagate over the transmission medium from the source router to the destination router  it is a function of the distance between the two routers  but has nothing to do with the packet s length or the transmission rate of the link        d  length of physical link   S  propagation speed in medium   2x108m sec  for copper wires  amp   3x108m sec  for wireless media    so propagation delay is   d s

User · Answer

The transmission delay is the amount of time required for the router to push out the packet  it has nothing to do with the distance between the two routers  The propagation delay is the time taken by a bit to to propagate form one router to the next

User · Answer

Obviously   packet length   propagation delay   trasmission delay is wrong   Let us assume that you have a packet which has 4 bits 1010 You have to send it from A to B   For this scenario Transmission delay is the time taken by the sender to place the packet on the link Transmission medium  Because the bits 1010  has to be converted in to signals So it takes some time Note that here only the packet is placed It is not moving to receiver   Propagation delay is the time taken by a bit Mostly MSB  Here 1  to reach from sender A  to receiver B

[networking] Propagation Delay vs Transmission delay

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