# Serial Link of 64 kbps

How much time does a serial link of 64 Kbps take to transmit a picture with 540 pixels.
This question is related to Cisco Interview

#### puneetkumar Profile Answers by puneetkumar

• Jul 5th, 2008

1 second

#### puneetkumar Profile Answers by puneetkumar

• Jul 5th, 2008

0.065 seconds

#### naveenkumard Profile Answers by naveenkumard

• Aug 2nd, 2008

It depends on the No. of bits thats used to represent a pixel!

#### shreekanthss Profile Answers by shreekanthss

• Feb 2nd, 2009

Suppose a pixel is represented by 8 bits. Then total size=540*8=4320bits
It takes 4320/64000=0.0675 seconds

#### japan_dave88 Profile Answers by japan_dave88

• Aug 20th, 2009

I would say that it also depends on length of the link as suppose
Two devices named A and B are located 1000 kilometer far and we have link of
64kbps.
Than when A will start sending first bit of the data will be traversed first.
This time of traversing is called propagation time.
So total time = propagation time+Time to transfer data after first bit has just
hit the device B
=1000*1000/velocity of light + (540*24)/(64*1024)
[24 bit because RGB or most of the format follows so]
=0.00333564095+0.19775390625
=0.201085 seconds.