Question One Draw an annotated end to end telephony network system to differentiate the following a local loop; subscriber's line, local switch, trunk switch, trunks(interchange carriers) b Draw a simplified block diagram of the South African telephony network, including the core network, zone codes, and area codes (kzn only). Illustrate how (0) an outgoing international call (ii) incoming international call (in) local call (iv) national call will be routed across the network. c Provide a simple classification of the various types of networks. d. Demonstrate, your understanding of the phrase "a telephony network is hierarchical in nature" Question Two a. Demonstrate your understanding of the principles of operation of key telephony set components. i) carbon or condenser microphones, speaker, hybrid circuit. b. Explain why a telephony call is full duplex in nature, and yet the subscriber line is a single pair cable. c. Describe pulse signaling and its relative advantages and disadvantages if any? d. Describe tone signaling and is relative advantages and disadvantages if any