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
- Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.
- 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
Define circuit switching and compare with packet switching → ADSL uses 1 VG UTP lines. Cable uses optical fiber to the neighborhood with thick coaxal cables. Thin coaxial drop cables go to the residences.
What is pulse code modulation? When is it used? → 1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber
What media are used for the local loop? → DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
What is a cellular telephone cell? What functions does the mobile telephone switching office serve? → A cell is an area covered by a cellsite with antenna and equipment to serve mobile phones in the cell. The MTSO coordinates activity among the cellsites. It connects wired customers via a POP.