In a token ring network, the transmission speed is 10 Mbps and propagation speed is 2 * 108 m/sec. The 1-bit delay in this network is equivalent to how many meters of cable?

Question

In process synchronization what is true about disabling interrupts and TSL?

1)Disabling interrupt is applicable only for single processor system

2)TSL is applicable only for single processor system

3)Both could be used in multiprocessor system

4)none of the above

Answer 1

1 bit delay means time to transmit 1 bit..which is 10'^-7 sec...the length will be traveled by signal in this time is 2*10^8*10^-7 meters=20 meters..1 bit delay is equivalent to 20 meters on cable

Answer 2

20 meteres of cable . there is a small conversion formula . which will be easy if u remmber it.

meters  <------------   seconds -------------> bits

               *velocity                 *bandwith.

which means from seconds to bits . multiply by velocity and to come opposite change multiply operation with divide.

1bit delay will be . then i have to come to seconds first and then to meters . 1/bandwith * velocity= 20