5 Written Questions
4 Multiple Choice Questions
- 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.
- DAC is Digital to Analog Conversion where as ADV is Analog to Digital conversion.
- Analog is electrical signals made from pressure waves.Digital is either on or off.
- 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
4 True/False Questions
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.
What is VoIP? What purpose does the VoIP gateway serve? What is required to be able to use VoIP? What layer-four protocol is used for VoIP? → 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.
What media are used for the local loop? → 1-pair Voice Grade UTP, 2-pair data-grade UTP, and optical fiber
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.