A telephone subscriber loop is illustrated in figure 1. The distance between the subscriber and the central office is 10 km and the total cable loss is found to be 4.9 dB. For the loop determine: a. What is the minimum size cable gauge used in the subscriber loop? (4 Marks) b. Calculate the value of current At OFF HOOK state. Comment on the result. (6 Marks

Rooble R1302 Telephone -40022 R =8500 swich 1 -48V de Figure 1 Table 1 Cable Gauge 19 Unit loop resistance (Q/km) Non-loaded Loaded 52.8 57.2 106.3 111.2 170.3 175.2 273.3 278.2 Loss (dB/km) Non-loaded Loaded 0.79 0.26 1.12 0.49 1.45 0.76 1.78 1.12 22 24 26 Rooble R1302 Telephone -40022 R =8500 swich 1 -48V de Figure 1 Table 1 Cable Gauge 19 Unit loop resistance (Q/km) Non-loaded Loaded 52.8 57.2 106.3 111.2 170.3 175.2 273.3 278.2 Loss (dB/km) Non-loaded Loaded 0.79 0.26 1.12 0.49 1.45 0.76 1.78 1.12 22 24 26