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Question 2 (a) Draw the frame associated with a North American T1 carrier. Clearly label the fields and compute the data rate associated with this carrier. (8 marks) (b) Outline the four main goals of the Synchronous Optical Network (SONET). (6 marks) Compute the Synchronous Payload Envelope data rate for the OC-48 carrier 32,500-Bit mulbframe sent in 120 msec o 1 2 3 4 5 6 7 10 11 13 14 1516 17 18 19 20 21 22 23 24 Reserved for future use 1250-Bit TDM frame sent in 4.615 msec 8.25-bit . (30 usec) guard time . 148-Bit data frame sent in 547 sec 000 Information Sync Information 000 26 - Bits 3 57 57 Voice/data bit The figure shown above illustrates the GSM framing structure. Describe the purpose of the following: (i) leading and trailing 000's; (ii) 8.25 bit guard band (6 marks)