5 Written Questions
4 Multiple Choice Questions
- 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.
- Analog is electrical signals made from pressure waves.Digital is either on or off.
- 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.
- 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.
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 DAC? ADC? → DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
What media are used for the local loop? → 1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber
Compare DSL and cable options → 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.