5 Written questions
4 Multiple choice questions
- 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.
- 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.
- Voice Over IP. The gateway translates between the signaling technology and transport technology.A codec is required. UDP and SIP
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.
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.
What is pulse code modulation? When is it used? → 1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber
What is the thrust of Nyquist's formula? (Sampling rate should be twice the bandwidth) → Pulse code modulation is the signal being sampled 8,000 times per second. Each sample is 1/8000 of a second. Each sample period, the amplitude of the signal is sampled. Each filter can distinguish 256 loudness levels.Produces 8 bits per sample.