Suppose that Bob sends 1,764,000 bits to Alice over a 10.5 Kbps link (note, 1 Kbps = 103 bps) that uses circuit switching. Suppose that circuit switching on the link is implemented using TDM, that a frame is 1 sec, and that a frame consists of 15 slots. Bob is assigned one slot in every frame. How many minutes does it take Bob to transmit all bits to Alice?
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- Consider TDM-based circuit switching with 8000 frames per second and 32 time slots per frame. During each time slot 8 bits are sent. What is the shortest time possible (in seconds) to transmit a 1 Mbyte file over the given link?Consider the following scenario: Frames of 12000 bits are sent over a 400kbps channel using a satellite whose propagation delay is 270ms. Acknowledgements are always piggybacked onto data frames. (That is, in the case of stop-and-wait, the next frame cannot be transmitted until the entire frame containing the acknowledgement is received.) Five-bit sequence numbers are used. What is the maximum achievable channel utilization for (a) Stop-and-wait. (b) Protocol 5 (i.e., Go Back N). (c) Protocol 6 (i.e., Selective Repeat)Consider a baseband bus where the average distance between any two stations is 375m with a data rate of 10Mbps and a propagation delay of 200m/μs. If two stations begin to transmit at exactly the same time, how long does it take for each to notice the interference, and how many bit are sent by each station by that time.
- In cdma2000 reverse link, a user stream of 9.6kbps is sent to an encoder r = 14 (4 coded bit for every 1 information bit), K = 9. and then through a symbol repetition (2x) (repeats the encoded bits twice). What coded data rate after repetition is obtained? What Walsh code length should you use to spread that stream into a typical 1.2288Mcps CDMA channel?Consider a 1Mbps transmission channel. The clock at the receiver has a drift of 1 second in one year. How long asequence of bits (or frame) can be sent before the clock drift could cause a problem? Assume that the sender and receiver are synchronized at the beginning of each frame and that they cannot resynchronize during the frame. Also, assume that the receiver samples the received signal at the middle of each bit duration to detect if it is 0 or 1.Unless specified otherwise, use the free space propagation speed of light 3x108 m/s to calculate the propagation delay. For numerical calculations, the results must show the appropriate unit. Show a complete solution for each problem3. Consider a digital multimedia transmission system. Separate audio and video coders are used to encode these signals. Audio and video bits are packed in packets together and transmitted over a transmission link. Each packet is 2,000 bytes long, which includes a 48-byte header. The system generates one packet every 40 ms. Calculate the following values:a. The minimum data transmission rate required to support the above system.b. The minimum signal-to-noise ratio (SNR) in dB required to transmit the above audio and video information. Assume a 400-kHz transmission channel bandwidth is used.c. The end-to-end packet delay over a 50-km link, using answer in Part a).
- Suppose that a SW ARQ system with 1-bit sequence numbering has a time-out value that is less than the time required to receive an ACK. Station A sends 5 frames to station B. No errors occur during transmission of all 5 frames. One ACK is lost when it is transmitted the first time (see the following table), and no transmission of that ACK. No errors occur during transmission of the other 4 ACKS. Sketch the sequence of frame exchanges that transpire between stations A and B. (а) error occurs in re- Last digit of your student ID number 0, 1 2, 3 Lost ACK 1 4, 5 6, 7 8, 9 2 3 42. Consider a bus-topology network with five stations. A reservation access method is used. Each station has infinite data to transmit. Each reservation slot has 10 microseconds (note that 1 microsecond = 106 second). For each station, one data transmission sends 1000 bits. The transmission rate over the medium is 10 Mbps. For a station, which is its throughput (in unit "Mbps")?Suppose, BanglaLink has 4 voice channels, each of 60Mbps. They use synchronous TDM to multiplex these channels. If 3 characters at a time are multiplexed (3 characters in each output slot), Draw the first two output frames with arbitrary inputs.
- Assume that the propagation speed in a coaxial cable is 2 ∙108 m/s a. Packets are transmitted using the ABP (alternate bit protocol) over a full-duplex 5-km coaxial cable with a 5 Mbps transmission rate. The packets and ACKs are 1500 bits long. The transmitter and receiver use a CRC chip and their processing time is negligible. How many packets are transmitted every second when there is no transmission error? b. Five transmission lines identical to the one discussed in a) are connected in series. A buffer is used at each connection between the links to store packets as required. How many packets will go through the five lines every second when there are no transmission errors? Now assume that a packet or its acknowledgement is corrupted on any given link with probability p. What is the new packet transmission rate through the five links? Comment. Assume the processing delays and queuing delays for both ends are negligible.Frames of 1000 bits are sent over a 106 bps duplex link between two hosts. The propagation time is 25 ms. Frames are to be transmitted into this link to maximally pack them in transit (within the link). 1.1 What is the minimum number of bits (1) that will be required to represent the sequence numbers distinctly? Assume that no time gap needs to be given between transmission of two frames.We have a 1000 m long 10 Mbps communication channel with ARQ protocol. The signal travels at a speed of 2 ∗ 10 ^ 8 ? / ?Assume that no frame is lost or damaged. Confirmation frames, control information are negligible in size.For what range of frame sizes do we get an efficiency of at least 70%?