Question

C. Binary 1 and 0 in PCM signal can be represented by several formats known as line coding. Propose THREE (3) of line coding formats that can self-synchronize and show their sketches for the PCM signal of 11001100110. (CO2: PO2 - 3 marks) d. A PCM-TDM system multiplexes 24 voice-band channels. Each sample is encoded into seven (7) bits, and a framing bit is added to each frame. The sampling rate is 9000 samples per second. BPRZ-AMI encoding is the line format. Determine: i. Line speed in bits per second. (CO2: PO2 - 3 marks) Minimum Nyquist bandwidth. (CO2: PO2 - 2 marks)

Answer 1

Ano A line code is the code used for data for dala transmission of a de digital signal a transmission. The three type of line coding formats are : i) Unipolar signaling stripolar signalling is also called as on-off Keying or simply Ook. The presence of pulse represents a 1 and the absence of peelse represents a 0. There are two variations in Unifolar Signalling- 1) Non Return to zero (NR Z) 2) Return to zero (R2) Refresentation of NR Z and RZ Brief olar signalling clock th 1 1 1 O data 1 0 0 Unipolar NRZ unipolar R2

1) Polar Segnalling (11001100110) There are two methods of solar signalling > Polar NRAZI - Polar RZ clock datdog o tve 1 - Polar 1 o NR2L O 0 0 O polas R2 (11001100110 133) Bipolar signalling Bipolar NR2 Befolar RZ. clock data 0 NRZA

d) j line sfeed in bets per second. Rь (nNtalls (7X244 9000 sombles per second Rb = 1521 Kbps 2) Minimum Nyquist Bandwidth fs », 2 fm tm t 9000 samples for second 2 Ifor 4500 kbps