5 Written questions
4 Multiple choice questions
- Voice Over IP. The gateway translates between the signaling technology and transport technology.A codec is required. UDP and SIP
- Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.
- Converts digital computer signals to analog and sent over telephone lines. 3G is for sending data faster with a speed 2-3 Mbps. WiMAX is to replace DSL, Cable and cellular service with 1-4 Mbps. Satellite is very expensive because of long transmission distance. Two way data transmission is expensive. Some carriers are pushing fiber directly to the home with 100 Mbps or more.
- GSM is dominant in Europe and Asia. CDMA is dominant in the US. CDMA can use the same channel in adjacent cells, providing more channel reuse and so more customers.
4 True/False questions
Describe the general structure of the PSTN - local loop, transport core, trunk line → Customer premises Equipment consists of telephones, wires, and other infrastructure on the customer premises. Most business have a PBX. It acts like switchboard. Local Loop- the access line to the customer. Transport-Carriage of voice during a conversation
What is the thrust of Nyquist's formula? (Sampling rate should be twice the bandwidth) → ---
Compare voice and data traffic; How are circuit switching and packet switching used with voice and data traffic? Why? → Circuit is an end-to-end connection between two subscribers. Capacity is reserved on all trunk lines and switches.
Compare DSL and cable options → DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.