# Modern Multiplexing Schemes questions

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need the answer of the Modern Multiplexing Schemes questions that i attached

Name: _____________________ Business Data Communications Homework 6 – Modern Multiplexing Schemes 19 possible points 1. The largest common SONET configuration used today is an OC-768, but OC-1536 exists. 2. YOU MUST SHOW ALL CALCULATIONS! .5 pt each A. What is the transmission bit rate for OC-1536 SONET signal? B. How many DS-0 circuits would you find in the OC_1536 SONET signal stream? 2. For this question, assume that a signaling element consists of one cycle of the transmitted carrier frequency. The carrier frequency is 15,000 Hz. Complete the following table: .33 pts for each table entry (4 total) Hint: Bit Rate = Baud Rate * Bits per Baud Modulation Scheme PSK QPSK QAM 16 QAM 64 QAM 256 QAM Baud Rate 15,000 15,000 15,000 15,000 15,000 15,000 Bit Rate Bits/Baud Homework 6 – Modern Multiplexing Schemes (Cont’d) 3. You need to transmit the following message using ASCII. Use single bit even parity, NRZ-I (Non-Return to Zero –Inverted) coding, and assume that the previous transmission ended with a positive voltage. The NRZ-I sequence will then be transmitted using the DSSS code shown below. Demonstrate your knowledge of DSSS by using the PN code shown below to encode only the first word (TU) for transmission. Here is the message to encode: Fl2K16 ASCII representation with EVEN parity: .5 pt for each correct ASCII representation (3 total) F: l: 2: K: 1: 6: Encoded into NRZ-I format: .5 pt for each ASCII character correctly coded (3 total) First 3 characters : Last 3 characters : Homework 6 – Modern Multiplexing Schemes (Cont’d) DSSS PN sequence to be used: 1st Letter (F) 2nd Letter (l) DSSS PN sequence: DSSS encoded sequence to be transmitted: .5 pt for each pulse correctly coded using the PN sequence (8 total) Homework 6 – Modern Multiplexing Schemes (Cont’d) 4. Two of the carrier frequencies being used by a new DSL system are 500 kHz and 1 mHz. In both cases, two frequency cycles constitute one signaling element. The highest modulation scheme that is used for the 500 kHz carrier is 256 QAM, and the highest modulation scheme that is used for the 1 mHz carrier is 32 QAM. Which of these two is capable of a higher overall bit rate? SHOW ALL WORK TO JUSTIFY YOUR ANSWER. 1 pt

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