A communication link has a bit rate of 10 Gbps and a length of 20 km. Propagation velocity is 2.5 × 108 m/s and ACK frames are piggybacked on information frames going in the reverse direction, one ACK for every received frame. Information frames are 9000 bytes long. The frame header is 100 bytes. (a) What is the minimum window size that maximizes the effective bit rate? (b) What is the information effective bit rate if the window size is 16 frames?

A communication link has a bit rate of 10 Gbps and a length of 20 km. Propagation velocity is 2.5 × 108 m/s and ACK frames are piggybacked on information frames going in the reverse direction, one ACK for every received frame. Information frames are 9000 bytes long. The frame header is 100 bytes. (a) What is the minimum window size that maximizes the effective bit rate? (b) What is the information effective bit rate if the window size is 16 frames?

Operations Research : Applications and Algorithms

4th Edition

ISBN:9780534380588

Author:Wayne L. Winston

Publisher:Wayne L. Winston

Chapter20: Queuing Theory

Section20.10: Exponential Queues In Series And Open Queuing Networks

Problem 8P

See similar textbooks

Similar questions

Computer Science A Go-Back-N (GBN) ARQ scheme has been designed with window-size W = 10 such that it is fully efficient when there are no errors on the channel. Assume that frame size is 20000 bits and the overhead bits are negligible. What is the bit probability error (as seen at Layer 2) that makes the Go-Back-N ARQ 50% efficient?
A communication link has a bit rate of 10 Gbps and a length of 20 km. Propagation velocityis 2.5 × 108 m/s and ACK frames are piggybacked on information frames going in the reversedirection, one ACK for every received frame. Information frames are 9000 bytes long. The frameheader is 100 bytes.(a) What is the minimum window size that maximizes the effective bit rate?(b) What is the information effective bit rate if the window size is 16 frames? The final answers are a) Wsmin = 25 (piggybacked means ACKs embedded in info frames), b) 6.53 Gbps
A network with a bandwidth of 20 Mbps can theoretically pass only an average of 12,000 frames per minute. a) What is the average size of the frame expressed in bits? b) The Achieved throughput is 5 Mbps. What is the ratio of throughput/bandwidth?
I A channel has a frequency range between 3 KHz and 14 KHz. The SNR in this channel is 25 dB. Find the maximum Bit rate of the channel and the Signal levels. [3 marks] For a bit stream "0 1 1 0 0 1 0 1", sketch the waveforms for (i) NRZ-I - (Assume the initial level at time zero is Low) (ii) NRZ-L - (assume 0 as High and 1 as Low) (iii) RZ Encoding – (Assume the initial level at time zero is Low) [3 marks]
Consider a full-duplex 256 Kbps satellite link with a 240 millisecond end-to-end delay. The data frames carry a useful payload of size 12,000 bits. Assume that both ACK and data frames have 320 bits of header information, and that ACK frames carry no data. What is the effective data throughput When using Stop and Wait?
55. Suppose a digitized voice channel is made by digitizing 8 kHz bandwidth analog voice signal. It is required to sample the signal at twice the highest frequency (two samples per hertz). What is the bit rate required, if it is assumed that each sample requires 8 bits? a. 32 kbps b. 64 kbps c. 128 kbps d. 256 kbps
A communication link has a bit rate of 1 Gbps and a length of 40 km. Propagation velocity is2.5 × 108 m/s. Information frames are 9200 bytes long. The frame header is 100 bytes. One100-byte ACK frame is sent for every received information frame.(a) What is the minimum window size that maximizes the effective bit rate?(b) What is the information effective bit rate if the window size is 3 frames?(c) What is the information effective bit rate if the window size is 100 frames? these are the final answers: a) Wsmin = 6, b) Reff = 554 Mbps, c) 989 Mbps
Data communication Suppose that the spectrum of a channel is between 8 MHz and 10 MHz, and the intended capacity is 8 Mbps. 1= With multiple signaling level, how many levels are required to obtain this capacity and how many bits can be transferred with each signal element? Constant values= c=3x^10°m/s, k=1,38x^10231/K
a) Digital communication in our time today has made technology easier to live with. Discuss the compression techniques which are proposed for still images? b) Under the coding techniques available in communication system, elaborate on the one which seeks to minimize the data which reduces the size. c) To ensure a transmission free loss in a communication network, some considerations were made to determine the channel capacity. An AWGN channel with 4.0112-kHz bandwidth with a noise power spectral density of W/Hz. The signal power necessary at the receiver is 0.111 mW. Find the channel capacity of this network that will bring about the loss free transmission.
231. A digitized voice channel is made by digitizing a 4-kHz bandwidth analog voice signal. We need to sample the signal at twice the highest frequency (two samples per hertz). We assume that each sample requires 8 bits. What is the required bit rate? a. 64 kbps b. 32 kbps c. 128 kbps d. 16 kbps
Consider an error-free 64 kbps satellite channel used to send 512 Byte data frames in one direction, with very short acknowledgment coming back the other way. The earth-satellite propagation delay is 270 msec. What is the efficiency if stop and wait flow control is used? What will be efficiency if the window size changed to 7? What is the optimal window size to maximize the channel efficiency?
Data communication Suppose that the spectrum of a channel is between 8 MHz and 10 MHz, and the intended capacity is 8 Mbps. a. What should be the signal-to-noise ratio (SNR) to obtain this capacity? Constant values= c=3x^10°m/s, k=1,38x^10231/K I