5 Written questions
4 Multiple choice questions
- Analog is electrical signals made from pressure waves.Digital is either on or off.
- Voice Over IP. The gateway translates between the signaling technology and transport technology.A codec is required. UDP and SIP
- 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.
- DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
4 True/False questions
Compare voice and data traffic; How are circuit switching and packet switching used with voice and data traffic? Why? → Voice traffice is fairly constant. Data traffice is short bursts with long silences. Circuit switching is not efficient with data.
What is pulse code modulation? When is it used? → 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.
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
Define telephone modem, DSL, cable modem, 3G cellular, WiMax, Satellite Internet, broadband on power lines, and fiber-to-the-home → 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.