5 [3] 004 The following table illustrates the operation of an FHSS system for one complete period of the PN sequence. 0 1 4 s 4 6 7. 1 1 1 1 1 0 0 0 Time Input data Frequency PN sequence 10 11 1 0 fio 1 001 110 011 16 17 12 0 11 13 1 14 1 15 1 18 1 19 0 1 Time Input data Frequency PN sequence 0 1 001 Answer the following: a) What is the period of the PN sequence, in terms of bits in the sequence? b) What is the number of bits per signal element? c) What is the number of FSK frequencies? The following figure shows synchronous TDM with four 1 Mbps data stream inputs and one data stream for the output. The unit of data is 1 bit. [3] CO3 1 Mbps .. 1 1 0 0 0 0 0 1 Mbps Frames 01 01 000111010001 1 ... 0 1 0 MUX 1 1 Mbps 0 0 1 0 0 1 Mbps Calculate (a) Output bit duration (b) Output bit rate (c) Output frame rate